2014 PORSCHE 911 TURBO brakes

Driving and Driving Safety 161
Examples:Switching adaptive cruise control on and off
Switching adaptive cruise control on
fPress button R on the control stalk. The grey status display appears on the multi-function display.Adaptive cruise control is ready.
Switching adaptive cruise control off
fPress button R on the control stalk. “ ACC off” appears on the multi-function display.The desired speed that was stored is deleted.The desired distance is set to the default value.
Operating states when adaptive cruise control is switched on
There are three possible operating states when adaptive cruise control is switched on.
Adaptive cruise control active
Adaptive cruise control automatically regulates the speed and distance from the vehicle in front.The status display B turns orange.
Adaptive cruise control is ready
Cruise control and distance control is inactive after pressing the brakes or interrupting by pressing the control stalk downwards (position 3, OFF ). The desired speed that was stored and the desired distance that was set are retained.The status display B turns grey.
For information on resuming cruise control and distance control:fPlease see the chapter “RESUMING CRUISE CONTROL AND DISTANCE CONTROL – RESUME” on page 164.
Adaptive cruise control passive
Cruise control and distance control is inactive after pressing the accelerator.“ ACC passive” appears on the multi-function display.The desired speed that was stored and the desired distance that was set are retained.The status display B turns grey. Adaptive cruise control is active again after you release the accelerator.
Setting and changing the desired speed
Preconditions
– Adaptive cruise control is switched on. – Vehicle is moving.– No stationary objects are detected in front.
If adaptive cruise control is switched on, and no desired speed is stored, the cruise control symbol appears but the desired speed field remains blank.
If a desired speed is stored and no vehicle was detected in front, the cruise control symbol and the desired speed are displayed.
If a desired speed is stored and a vehicle was detected in front, a vehicle symbol and the desired speed are displayed.
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Driving and Driving Safety 167
Active Safety – Porsche “Active Safe”
The adaptive cruise control sensor is used for the Porsche “Active Safe” functions.
These include: – Brake system prefilling Prefilling of the brake system if the radar sensor detects that the vehicle is coming critically close to a moving obstacle in order to bridge the air gaps and improve braking response.– Brake Assist Reduction of the activation threshold of the Brake Assist function if the sensor detects that the vehicle is coming critically close to a moving obstacle.The activation threshold of the Brake Assist function is reduced in three stages, depending on how critical the danger situation is.– Target braking If the radar sensor detects that the vehicle is coming critically close to a moving obstacle and, at the same time, braking power is inadequate, brake pressure can be increased in accordance with the situation, through to full braking if required.
Information
All Porsche “Active Safe” functions are active for speeds of more than 20 mph (30 km/h).
Latent warning (visual)
If the vehicle is driving too close to the vehicle in front for a long time, to avoid a collision if the vehicle in front brakes, a latent warning appears on the multi-function display to warn the driver.fStay further back from the vehicle in front if necessary.
Prewarning (acoustic and visual)
If the radar sensor detects that the vehicle is coming critically close to and is very likely to collide with a moving obstacle in front, an acoustic and visual prewarning is issued. This warns the driver and still allows a collision to be prevented if the driver reacts accordingly.
Risk of collision with the vehicle in front.fBrake immediately.
Insufficient distanceWARNINGh
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174 Driving and Driving Safety
Selector-lever Positions
P – Parking lock
fEngage parking lock only when the vehicle is stationary.If selector-lever position P is flashing in the instrument panel, the parking lock is not engaged. The vehicle can roll away.Shift again from selector-lever position R to P.fActivate the electric parking brake and then engage the parking lock.If selector-lever position P is flashing in the instrument panel, the parking lock is not engaged. The vehicle can roll away.Shift again from selector-lever position R to P.
Vehicles without Porsche Entry & Drive: The ignition key can only be removed in selector- lever position P.
R – Reverse gear
fSelect only if the vehicle is stationary and the brake is applied.
N – Neutral
Selector-lever position N must be selected for towing or in car washes, for example.fOnly select the desired position for driving off ( D, M or R) when the engine is idling and the brake pedal is pressed.
D – Automatic selection mode
Select position D for “normal” driving. The gears are shifted automatically according to the accelerator position and speed.
Depending on the way the vehicle is driven (economical, comfortable or sporty driving style) and on the resistance (e.g. uphill), the gear-changing points are shifted towards higher or lower engine-speed ranges.The accelerator position, driving speed, engine speed, longitudinal and lateral acceleration and the road profile all have an influence on the gear-changing characteristic.
Unwanted upshifts, e.g. when entering bends, are prevented by swiftly releasing the accelerator pedal.
Depending on lateral acceleration, upshifts on bends are not made until the engine-speed limit is reached.
When you brake, and depending on the amount of deceleration, the PDK transmission changes down earlier.For subsequent cornering, the correct gear is engaged when pressure is applied to the brakes before the bend. The bend is taken in the right gear, and when you accelerate out of the bend you do not have to change down.
With a sporty driving style, downshifts are already initiated when the brake pedal is touched lightly. This further enhances a dynamic driving style.
The PDK transmission temporarily changes to the sportiest gear-changing map, i.e. to the highest possible gear-changing points, if the accelerator pedal is pressed quickly. The transmission accordingly shifts down immediately by one or two gears (temporary downshift).
The transmission no longer selects 7th gear at very high driving speeds.
However, if necessary, the gear can be selected manually.
Upshifts and downshifts are avoided as far as possible when PSM is active. In the case of high wheel slip when PSM is switched off, upshifts are prevented until slip is no longer detected.
Driving in coasting mode
Through attentive driving, fuel can be saved in coasting mode. The vehicle rolls with the engine disengaged and at idle speed without engine braking effect.
Preconditions for automatic coasting mode – Driving in selector lever position D – Coasting mode is switched on.Indicator light on the button is off.– Sport and Sport Plus modes are switched off– PSM is active– Cruise control is not active– Engine, transmission and battery are at operating temperature– Calm/economic driving style– Slight uphill or slight downhill gradientsfSlowly take your foot off the accelerator.
The engine is disengaged and runs at idle speed. The vehicle rolls with no engine braking effect. Coasting mode is recognizable by the idle speed indicated on the tachometer.
Information
In the case of a sporty driving or when swiftly releasing the accelerator pedal, coasting mode is suppressed to allow targeted use of the engine braking effect. On more pronounced uphill gradients, “coasting” is also prevented as the coasting phases are very short due to the gradient and no significant fuel savings can be achieved. On more pronounced downhill gradients, coasting
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Driving and Driving Safety 181
Porsche Stability Management
(PSM)
PSM is an active control system for stabilization of the vehicle during extreme driving maneuvers.
PSM makes use of both the automatic brake differential (ABD) and anti-slip regulation (ASR) systems, as well as the functions of the anti-lock brake system (ABS) and engine drag torque control system (MSR).
In spite of the advantages of PSM, it is still the driver’s responsibility to adapt his driving style and maneuvers in line with road and weather conditions, as well as the traffic situation.
The increased safety that is provided should not induce you to take greater risks with your safety. The limits set by the physics of driving cannot be overcome, even with PSM.Risk of accidents due to inappropriate speed cannot be reduced by PSM.
Advantages of PSM
– Best possible traction and lane-holding ability in all driving situations – even on road surfaces with varying friction.– The system compensates for undesired vehicle reactions (Ferraria effect) when the driver releases the accelerator pedal or brakes on bends. This compensation functions up to the maximum lateral acceleration.– PSM actively helps to stabilize the vehicle if necessary during dynamic driving maneuvers (e.g. rapid steering movements, during lane changes, or on alternating bends).
– Improved braking stability on bends and on different or varying road surfaces.– Improved brake function and shorter stopping distance in the event of emergency braking.
Readiness for operation
PSM is switched on automatically every time you start the engine.
Function
Sensors at the wheels, brakes, steering system and engine continuously measure:– Speed– Direction of travel (steering angle)– Lateral acceleration– Axial acceleration– Rate of turn about the vertical axis
PSM uses these values to determine the direction of travel desired by the driver.PSM intervenes and corrects the course if the actual direction of motion deviates from the desired course (steering-wheel position):It brakes individual wheels as required. If necessary, PSM also influences the engine power or the gear-changing characteristic of Porsche Doppelkupplung (PDK) in order to stabilize the vehicle.
The events below inform the driver of PSM control operations and warn him to adapt his driving style to the road conditions:– PSM warning light on the instrument panel flashes.– Hydraulic noises can be heard.– The vehicle decelerates and steering-wheel forces are altered as PSM controls the brakes.– Reduced engine power.– The brake pedal pulsates and its position is changed during braking.In order to achieve full vehicle deceleration, foot pressure must be increased after the brake pedal has begun vibrating.
Examples of PSM control operations
– If the “front wheels of the vehicle drift” on a bend, the engine power is reduced and the rear wheel on the inside of the bend is braked if necessary.– If the rear of the vehicle swings out on a bend, the front wheel on the outside of the bend is braked.– Brake system prefilling:The brake system is prepared for possible subsequent emergency braking if the accelerator pedal is released suddenly and quickly. The brake system is prefilled and the brake pads are already applied gently to the brake disks.– Brake booster (Hydraulic Brake Assist):In the event of an emergency braking operation where the pedal force is insufficient, a brake booster provides the braking pressure necessary for maximum deceleration at all 4 wheels.
Loss of control over the vehicleWARNINGh
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208 Parking
Ultrasound sensors
Maintenance notes
fThe sensors must always be kept free of dust, ice and snow in order to ensure that they are fully functional.fDo not damage sensors by abrasion or scratching.fMaintain sufficient distance when cleaning with high-pressure cleaning equipment.The sensors will be damaged if the pressure is too high.
Signal tones/function
When reverse gear is selected, ParkAssist confirms that it is switched on by issuing a short signal tone .
If the vehicle has front ParkAssist, no signal tone will be issued when reverse gear is selected.Instead, the ParkAssist visual display will appear on the central screen of the Porsche communication system.
A detected obstacle is signaled by an intermittent tone . The intervals decrease as the obstacle is approached.
If the distance drops to less than approx. 12 in. (30 cm), a continuous tone sounds.fSet the radio volume so that the signal tones are not drowned out.
The volume of the signal tones can be changed individually.
For information on changing the signal tone volume:fPlease see the chapter “ADJUSTING PARKASSIST VOLUME” on page 126.
Even when using ParkAssist, the driver is still responsible for taking due care when parking and when assessing obstacles.A continuous tone sounds when there is a risk of collision.fDo not drive rearward any further once a continuous tone sounds.
Limits of ultrasonic measurement
– ParkAssist cannot detect sound-absorbing obstacles (e.g. winter driving, powder snow, clothing made from fabric or fur),– sound-reflecting obstacles (such as glass surfaces and flat painted surfaces),– and very thin obstacles (e.g. thin posts).
Other ultrasound sources (e.g. pneumatic brakes of other vehicles, sweeping machines and jack hammers) can interfere with the detection of obstacles.
Care Required ParkingWARNINGh
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Maintenance and Car Care 231
Fuel Evaporation Control
Fuel tank venting
The evaporation chamber and the carbon canister prevent fuel vapors from escaping to the atmosphere at extreme high outside temperatures, when driving abruptly around curves and when the car is parked at an incline or in any other non level position.
Vapor control system and storage
When the fuel tank is filled, vapors are collected in the evaporation chamber by a vent line leading the vapors to the carbon canister where they are stored as long as the engine does not run.
Purge system
When the engine is running, the fuel vapors from the canister will be mixed with fresh air from the ambient air of the canister. This mixture will be directed to the intake air housing by the tank vent line, mixed with the intake air and burned during normal combustion.
Car Care Instructions
fPlease see the chapter “MEASUREMENTS ON TEST STANDS” on page 221.
Regular Maintenance and correct care helps to maintain the value of your car and is also a requirement for maintaining the manufacturers vehicle warranties.
Your authorized Porsche dealer has specially developed car-care products from the Porsche program available either singly or as complete car-care sets. They will be pleased to help you select suitable products.
Whether you use Porsche products or other commercially available cleaning agents first make sure of their correct application.
A Porsche that is well-cared for can look like new for years. It all depends on the amount of care the owner is willing to give the car.
Cleaning agents may be hazardous to your health. Most chemical cleaners are concentrates which require dilution. High concentrations might cause problems ranging from irritation to serious injury.fKeep cleaning agents out of reach from children.fObserve all caution labels.fAlways read directions on the container before using any product. These directions may contain information necessary to avoid personal injury.fDo not use fuel, kerosene, naphtha, nail polish remover or other volatile cleaning fluids. They may be toxic, flammable or hazardous in other ways. Only use spot removing fluids in a well vented area.fDo not clean the underside of chassis, fenders, wheel covers, etc., without protecting your hands and arms as you may cut yourself on sharp-edged metal parts.
Risk of damage to the vehicle or property from cleaning agents.fObserve all caution labels.
Information
Moisture and road salt on brakes may affect braking efficiency. fTest the brakes after each vehicle washing.
Chemical CleanersWARNINGh
NOTICE
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232 Maintenance and Car Care
High-pressure cleaning equipment, steam cleaners
Risk of damage as a result of using high-pressure cleaning equipment, steam cleaners or similar.
High-pressure cleaning equipment, steam cleaners or similar can damage the following components:– Convertible top– Tires– Logos, emblems– Painted surfaces– Alternator– Electrical components and plug connections in the engine compartment– ParkAssist sensors– Radar sensor for adaptive cruise control– Reversing camerafAlways read the operating instructions provided by the equipment manufacturer.fAlways cover the lid of the brake fluid reservoir prior to cleaning. Never point the cleaning jet directly at the lid.fWhen cleaning with a flat-jet nozzle or a so-called “dirt blaster”, maintain a minimum distance of 20 in. (50 cm).fNever use high-pressure cleaning equipment or steam cleaners with a round-jet nozzle.A high-pressure cleaning device or steam cleaner fitted with a round nozzle will damage your vehicle. The tires are particularly susceptible to damage.fDo not point the cleaning jet directly at any of the aforementioned components.
Decorative film
Risk of damage due to separation of the decorative film when using high-pressure cleaning equipment, steam cleaners or similar cleaning equipment.fDo not use high-pressure cleaning equipment, steam cleaners, etc. to clean decorative films.
Care of door lock
fTo prevent the door lock from freezing during the cold season, cover the lock barrel with suitable adhesive tape while washing the vehicle.
If the lock still freezes, use an ordinary de-icer. In many cases, a well warmed key can help.fNever use excessive force.
Car washing
The best protection for the vehicle from the damaging effects of the environment is frequent washing and preservation.
The longer road salt, road dust, industrial dust, insect remains, bird excrement, and tree exudations (e.g. resin, pollen), etc. are allowed to remain on the bodywork, the more harmful their effect.
Observe the following points in order to ensure that the vehicle is washed thoroughly without damaging the paintwork: fThe underside of the vehicle should also be thoroughly washed at the end of the gritting season at the latest.fWash your vehicle only at sites provided for this purpose to prevent soot, grease, oil and heavy metals from entering the environment.
fNew cars should be washed carefully with plenty of clear water to protect the new paint work. Dark paint finishes show up the smallest of surface damage (e.g., scratches) more readily than lighter colors. Dark colors are slightly more susceptible to scratching and require particularly careful paint care.Dark paints make even the smallest surface blemishes (scratches) more conspicuous than lighter colors.fDo not wash your Porsche in direct sunlight or when its body is hot.fWhen washing by hand, use a car shampoo, plenty of water, and a soft sponge or washing brush.We recommend Porsche car shampoo.fStart washing the vehicle by thoroughly wetting the paintwork and rinsing the heavy dirt off.fAfter washing the vehicle, rinse it thoroughly with water and rub it dry with chamois-leather.Do not use the same chamois for rubbing dry as you use for cleaning the windshield and windows.
Reduced or uneven braking action may be caused by wet brakes.fAfter washing the vehicle, test the brakes and steering and briefly brake the disks dry.When doing so, make sure that vehicles traveling behind you are not affected.
NOTICENOTICE
Wet BrakesWARNINGh
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236 Maintenance and Car Care
If cleaning agents (e.g. wheel cleaning agents) come into contact with the brake disks, the resulting film on the brake disks can impair braking performance.fMake sure that no cleaning agent comes into contact with the brake disks.fIf cleaning agent has come into contact with the brake disks, clean the brake disks thoroughly with a strong jet of water.fPaying attention to any road users behind you, dry the brake disks by applying the brakes.
Stainless steel tailpipes
Stainless steel tailpipes can discolor due to soiling, strong heat and combustion residues.
The original shine can be achieved again using commercially available metal luster paste or metal polish.
Cleaning door, roof, lid and window seals
The lubricant coating on the inner door seals may be damaged by unsuitable cleaning and care agents.fDo not use any chemical cleaning agents or solvents.fDo not use any preservative agents.
fWash dirt (e.g. abrasion, dust, road salts) from all seals regularly using warm soapy water.fIf there is a risk of frost, protect the outer door seals and the lid and flap seals against freezing into place with a suitable care product.
Leather care
The natural surface markings of leather, e.g. creases, healed scars, insect sting marks, structural differences and slight variations in shade and grain add to the attractiveness of the high-quality natural leather product.
Observe the following care instructions:
The leather will be damaged by the use of unsuitable cleaning and care agents and by inappropriate treatment.fDo not use caustic cleaners or hard cleaning objects!fMake sure that perforated leather does not get wet on its reverse side.fRemove water drops from the leather without delay.
fClean all types of leather regularly to remove fine dust using a soft, damp, white woolen cloth or a commercially available microfiber cloth.fRemove heavy contamination (not water or moisture stains) with a leather cleaner.Always read the instructions for use given on the containers.We recommend Porsche leather care liquid.fTreat cleaned leather only with a leather care product.We recommend Porsche leather care liquid.
Seats with seat ventilation
Care instructions for water or moisture stains.
Rain water or moisture can stain the perforated leather.
Removing water and moisture stains
Preconditions: – Seat heating and seat ventilation must be switched off.– No direct sunlight.– Do not use leather cleaners or care products to remove water and moisture stains.fBlot the entire seat or backrest surface using a clean, absorbent sponge and distilled water.Make sure that the perforated leather does not get wet on its reverse side.fAllow the seat covering to dry completely at room temperature out of direct sunlight.Do not dry the seat covering by switching on the seat heating and seat ventilation.fOnce dry, wipe the seat covering with a dry, lint-free cloth.
Cleaning carpet, floor mats
fUse a vacuum cleaner or a brush (not too soft) for cleaning.fHeavy dirt and stains can be removed with a stain remover.We recommend Porsche stain remover.
To protect carpets, the Porsche range of accessories includes mats of the correct size and with the appropriate fastening.
Cleaning Agents on Brake Disks
WARNINGh
NOTICE
NOTICE
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