2021 VOLKSWAGEN UP! lane assist

to assist every time that there is a sudden change in the road surface quality. If a section of dry
road is suddenly covered with water, mud or snow, ESC will not be able to assist in the same
manner as on a dry road. If the vehicle aquaplanes (drives on a layer of water rather than on the
road surface), ESC will not be able to assist in steering the vehicle as the contact to the road
surface has been interrupted and it is therefore no longer possible to steer or brake the vehicle.
Always adapt your speed and driving style to suit visibility, weather, road and traffic conditions. ESC
cannot defy the laws of motion, improve the available power output, or keep the vehicle on the road
if insufficient care and attention on the part of the driver causes the vehicle to leave the road.
Instead, ESC increases the possibility of keeping the vehicle under control and, in extreme on-road
driving situations, it assesses the driver’s steering input and helps the vehicle to continue in the
required direction. If the vehicle is driving at a speed that leads it to leave the road before the ESC
can provide any kind of support, the ESC will be unable to provide any assistance.
The ABS, BAS, TCS and EDL systems are integrated into the ESC. The ESC is always on.
Anti-lock brake system (ABS)
The ABS prevents the wheels from locking when the brakes are applied up until the point where the
vehicle is nearly stationary and assists the driver in steering the vehicle and keeping it under
control. This means that the vehicle is less likely to spin, even when the brakes are depressed fully:
•Depress and hold the brake pedal with force. Do not take your foot off the brake pedal or
reduce the force on the brake pedal!
•Do not pump the brake pedal or reduce the pressure on the brake pedal!
•Steer the vehicle while the brake pedal is fully depressed.
•The ABS will switch off when the brake pedal is released or if the pressure on the brake pedal is
reduced.
If the ABS is taking corrective action, there is a pulsing movement in the brake pedal and some
noise. However, ABS will not necessarily guarantee shorter braking distances in all conditions. The
braking distance could even be longer when braking on gravel or on fresh snow covering an icy or
slippery surface.
Electronic brake pressure distribution system (EBD)
Every vehicle's centre of gravity moves forwards whenever the brake is operated. This means that
the rear wheels are in danger of locking due to the lower traction. The electronic brake pressure
distribution system controls the brake pressure for the rear wheels and thereby ensures the
optimum distribution of brake pressure between the front and rear axles. Under normal conditions,
the system will prevent the rear from breaking away if too much brake pressure if applied to the rear
wheels. The electronic brake pressure distribution system is included in the ABS' scope of
functions.
Brake Assist system (BAS)
The brake assist system can help to reduce the braking distance. The brake assist system
reinforces brake pressure hydraulically when the driver depresses the brake pedal quickly in an
emergency situation. As a result, full braking power is made accessible very quickly, brake pressure
is increased and the braking distance reduced. In this way, the ABS is activated more quickly and
more effectively.
Do not reduce the pressure on the brake pedal. The brake assist system will switch off the
hydraulic brake servo automatically when the brake pedal is released or if the pressure on the
brake pedal is reduced.
Traction Control System (TCS) or Traction Control (TC)
The TCS or TC reduces the engine output if wheelspin occurs and adapts the output to suit road
surface conditions. TCS or TC helps the car to start moving, accelerate and climb gradients in
unfavourable road conditions.
Electronic differential lock (EDL)
The EDL is available for normal driving on straight roads. EDL brakes the wheel that has lost
traction and distributes the driving force to the other drive wheel. To prevent the disc brake of the
braked wheel from overheating, the EDL cuts out automatically if subjected to excessive loads. The
EDL will switch on again automatically when the brake has cooled down.

The ESC or the TCS/TC can only function properly if all four wheels have the same tyres.
Any differences in the rolling radius of the tyres can cause the system to reduce engine power
unexpectedly.
If the ABS fails, the ESC, TCS, TC and EDL will also cease to function.
Control processes running in the systems described may cause operating noises.
Brake fluid
Fig. 101 In the engine compartment: cap on the brake fluid container
First read and observe the introductoryinformation and safety warnings⇒
Introduction
Brake fluid will gradually absorb water from the surrounding air. The brake system will be damaged
if there is too much water in the brake fluid. The boiling point of the brake fluid is also considerably
reduced by the water content. Heavy use of the brakes may cause a vapour lock in the brake
system if the water content is too high. Vapour locks reduce levels of braking power, considerably
increase braking distance and can even cause the brake system to fail completely. Your own safety
and that of other road users depends on having a brake system that functions properly at all times
⇒.
Brake fluid specification
Volkswagen has developed a brake fluid that has been optimised for the brake system in the
vehicle. To ensure optimal operation of the brake system, Volkswagen recommends the use of
brake fluid compliant with VW standard 501 14.
Driving fast on icy, slippery or wet roads can lead to a loss of control of the vehicle and could
cause serious injury to the driver and passengers.
•Adapt your speed and driving style to suit visibility, weather, road and traffic conditions. Do
not let the extra safety afforded by the brake assist systems ABS, BAS, EDL, TCS, TC and
ESC tempt you into taking any risks when driving.
•The brake assist systems cannot defy the laws of motion. Slippery and wet roads will
remain dangerous, even when the ESC and other systems are active.
•Driving too fast on wet roads can cause the wheels to lose contact with the road surface
and aquaplane. A vehicle cannot be braked, steered or controlled once it has lost contact
with the road surface.
•Brake assist systems cannot prevent an accident if, for example, you are driving too close
to the vehicle in front or are driving too fast for the individual situation.
•Although the brake assist systems are very effective and can help to control the vehicle in
difficult driving situations, please always remember that the driving stability of the vehicle
depends on the tyre grip.
•When accelerating on a slippery surface, for example on ice and snow, press the
accelerator carefully. The wheels can spin even with active brake assist systems and this
can lead to a loss of control of the vehicle.
WARNING
ESC will be considerably less effective if other components and systems that affect driving
dynamics are not serviced correctly or are not functioning properly. This also applies, but not
exclusively, to the brakes, tyres and other systems that have already been named.
•Please always note that modifications and changes to the vehicle can affect the function of
the ABS, BAS, TCS, TC, EDL and ESC.
•Alterations to the suspension system or the use of non-approved wheel and tyre
combinations can affect the function of ABS, BAS, TCS, TC, EDL and ESC and reduce
their effectiveness.
•Suitable tyres are also crucial if ESC is to function optimally ⇒ Wheels and tyres.
WARNING

Stop the vehicle at a safe distance away from moving traffic and on a suitable surface .
Switch on the hazard warning lights using the button .
Apply the handbrake firmly Braking, stopping and parking.
Select the neutral position or move the selector lever to N Changing gear.
Stop the engine and remove the vehicle key from the ignition .
Ensure that all occupants exit the vehicle away from moving traffic and proceed to a safe
position, e.g. behind the safety barrier.
Take all vehicle keys with you when you leave the vehicle.
Place the warning triangle in position to draw the attention of other road users to your
vehicle.
Allow the engine to cool down and, if necessary, seek expert assistance.
•Braking, stopping and parking ⇒ Braking, stopping and parking
•Manual opening and closing ⇒ Manual opening and closing
•Vehicle toolkit ⇒ Vehicle toolkit
•Changing a wheel ⇒ Changing a wheel
Making you and your vehicle safe
Fig. 140 In the upper part of the centre console: button for switching the hazard warning lights on
and off
First read and observe the introductoryinformation and safety warnings⇒
Introduction
Observe any legislation concerning the safety of broken-down vehicles. For example, many
countries stipulate that you have to switch on the hazard warning lights and wear a high-visibility
waistcoat ⇒ First aid kit, warning triangle and fire extinguisher.
Checklist
To ensure your own safety and that of your passengers, observe the following actions in the
specified order ⇒:
When the hazard warning lights are switched on, for example if you are being towed, you can still
indicate a change in direction or lane change by operating the turn signal. The warning lights will be
interrupted temporarily.
Switch on the hazard warning lights:
•When traffic ahead suddenly starts moving more slowly or you reach the tail end of a traffic jam,
to will warn vehicles behind you.
•When there is an emergency.
•When the vehicle breaks down.
•When tow-starting or towing.
Always follow local regulations for the use of the hazard warning lights.
If the hazard warning lights are not working, use an alternative method of drawing attention to the
broken-down vehicle. This method must comply with traffic legislation.
Broken-down vehicles increase the risk of accidents in road traffic – both for you and other
road users.
•Stop the vehicle as soon as possible and when safe to do so. Park the vehicle at a safe
distance from moving traffic in order to lock all doors securely in an emergency. Switch on
the hazard warning lights to warn other road users.
•Never leave children or people requiring assistance alone in the vehicle when the doors
are locked. This may mean that they are locked in the vehicle in an emergency. People
locked in the vehicle may be subjected to very high or very low temperatures.
WARNING