2008 MITSUBISHI LANCER EVOLUTION X brake cylinder

35A-1
GROUP 35A
BASIC BRAKE
SYSTEM
CONTENTS
GENERAL . . . . . . . . . . . . . . . . . . . . .35A-2
CONSTRUCTION DESCRIPTION . . .35A-5
MASTER CYLINDER . . . . . . . . . . . . . . . . . 35A-5
BRAKE BOOSTER . . . . . . . . . . . . . . . . . . . 35A-5
BRAKE PEDAL . . . . . . . . . . . . . . . . . . . . . . 35A-7
FRONT BRAKE . . . . . . . . . . . . . . . . . . . . . . 35A-8
REAR BRAKE . . . . . . . . . . . . . . . . . . . . . . . 35A-9
BRAKE LINE . . . . . . . . . . . . . . . . . . . . . . . . 35A-10

GENERAL
BASIC BRAKE SYSTEM35A-2
GENERALM2350000100956
Brake systems with higher reliability and durability
have achieved distinguished braking performance.
FEATURES
.
IMPROVEMENT OF BRAKING PERFOR-
MANCE
•A 10-inch single brake booster with the variable
boost ratio mechanism has been used to assure
maximum braking force with less pedal pressure
in case of emergency.
•In addition to the 10-inch single brake booster, a
small and long stroke-type master cylinder has
been adopted to achieve downsizing and secure
assist force.
•15-inch or 16-inch ventilated disc brakes have
been adopted for the front.
•8-inch leading trailing-type drum brake, 14-inch
or 16-inch solid disc brake has been adopted for
the rear.
.
IMPROVEMENT IN SAFETY
•The 4-wheel anti-lock brake system (4ABS) has
been installed to prevent slippage resulting from
the wheel lock and assure stable vehicle posture
and driveability.
•A rear wheel early lock-prevention proportioning
valve has been used.
•Electronic control braking force distribution sys-
tem (EBD) has been adopted to assure the maxi-
mum braking force independently of the
passenger's position in the vehicle. with ABS>
•X-type piping of brake lines have been adopted
for the front and rear wheels.
•Audible wear indicators are used on the front and
rear brake pads to warn the driver of wear limit.
.
SERVICE QUALITY IMPROVEMENTS
•Diagnostic function has been adopted to ABS for
easier inspection.
•Brake fluid reservoir, master cylinder, and brake
booster have been integrated for downsizing and
better serviceability.

GENERAL
BASIC BRAKE SYSTEM35A-3


AC609311AB
Brake booster
Master cylinder
Proportioning valve
Front disc brake
Reserve tank
Rear drum brake
Rear disc brake
AC609312AB
Brake booster
Master cylinder
Hydraulic unit
Front disc brake
Rear drum brake
Rear disc brake
Reserve tank

GENERAL
BASIC BRAKE SYSTEM35A-4
SPECIFICATIONS
ItemSpecifications
Master cylinderTy p eTandem type
I.D. mm (in)20.6 (0.81)
Brake boosterTy p eVacuum type, single
Effective dia. of power cylinder mm (in)254 (10.0)
Boost ratioVehicles without ABS6.5 (Pedal pressure: 188N)
Vehicles with ABS6.5 (Pedal pressure: 92N)
8.5 (Pedal pressure: 156N)
Rear wheel hydraulic control typeVehicles without ABSProportioning valves
Vehicles with ABSElectronic control braking force
distribution system (EBD)
Front disc brakeTy p eVehicles with 16-inch wheelFloating caliper 1 piston
ventilated disc (V5-S57)
Vehicles with 18-inch wheelFloating caliper 1 piston
ventilated disc (V6-S57)
Disc effective dia ×
thickness mm (in)Vehicles with 16-inch wheel222 × 26 (8.7 × 1.02)
Vehicles with 18-inch wheel241.6 × 26 (9.5 × 1.02)
Cylinder I.D. mm (in)57.1 (2.25)
Pad thickness mm (in)10.0 (0.39)
Clearance adjustmentAutomatic adjustment
Rear drum brakeTy p eLeading trailing drum
Drum I.D. mm (in)203 (8.0)
Wheel cylinder I.D. mm (in)19.0 (0.75)
Lining thickness mm (in)4 (0.157)
Clearance adjustmentAutomatic
Rear disc brakeTy p eVehicles with 16-inch wheelFloating caliper 1 piston solid disc
(S4-S35)
Vehicles with 18-inch wheelFloating caliper 1 piston solid disc
(S6-S35)
Disc effective dia ×
thickness mm (in)Vehicles with 16-inch wheel226 × 10 (8.9 × 0.39)
Vehicles with 18-inch wheel258 × 10 (10.2 × 0.39)
Cylinder I.D. mm (in)34.9 (1.37)
Pad thickness mm (in)10.0 (0.39)
Clearance adjustmentAutomatic adjustment

CONSTRUCTION DESCRIPTION
BASIC BRAKE SYSTEM35A-5
CONSTRUCTION DESCRIPTION
MASTER CYLINDERM2350001000576
The master cylinder is a tandem type and is inte-
grated with the brake fluid reservoir with the level
switch.
BRAKE BOOSTERM2350002000698
A 10-inch single brake booster has been installed.
The variable boost ratio mechanism which increases
the brake booster gain has been adopted.
AC609255
AC609469 AC505913
AB
Primary piston assembly Secondary piston assembly Brake booster Master cylinderReserve tank
AC505931AB
Diaphragm
Reaction disc
Operating rod
Push rod
Barometric pressure chamber Booster return spring

CONSTRUCTION DESCRIPTION
BASIC BRAKE SYSTEM35A-10
BRAKE LINEM2350005000266
PROPORTIONING VALVE
A proportioning valve is used to prevent early locking
of the rear wheels, in order to provide improved sta
-
bility during braking.
AC609305
From master cylinder rear brake system
To rear brakeO-ring U-packing Sleeve
Guide Seal
Proportioning valveMaster cylinder
SpringPlateValve
AB

CONSTRUCTION DESCRIPTION
FOUR-WHEEL ANTI-LOCK BRAKE SYSTEM (4ABS)35B-7
ABS-ECUM2351003000520
•By integrating ABS-ECU into the hydraulic unit,
no wiring harness for sending drive signal of the
solenoid valve and pump motor is required,
assuring higher reliability.
•Self-diagnostic and memory functions are inte-
grated into ABS-ECU. If any malfunction is
detected by the self-diagnostic function,
ABS-ECU activates a fail-safe function and illumi
-
nates the ABS warning light and brake warning
light
*.
NOTE: *: The brake warning light is used as the
EBD control warning light.
•ABS-ECU detects vehicle speed from the signals
of the wheel speed sensor and its recognizes the
wheel rotation status, estimates the wheel slip
condition based on the preprogrammed algo
-
rithm, and then controls the solenoid valve in the
hydraulic unit so that the wheels do not lock.
ABS hydraulic pressure control
ABS control cycle
1. The ABS-ECU calculates the speed and deceler-
ation of each wheel based on the signals from the
four wheel speed sensors, and estimates the
vehicle speed at that time.
2. When the brake pedal is depressed, the brake
fluid pressure applied to the wheel cylinder
increases, and the wheel speed decreases.
When the difference between the wheel speed
and vehicle speed increases, and the vehicle
deceleration goes below the specified value (Point A), ECU determines that the wheels are
about to be locked. At this time, ECU reduces the
brake fluid pressure by outputting the pressure
decrease signal to the solenoid valves (IN, OUT).
(between a and b)
3. When the vehicle deceleration and wheel speed
begin recovery, and the vehicle speed reaches
the point B, ECU outputs the pressure hold signal
to maintain the wheel cylinder fluid pressure.
(between b and c)
AC506830AB
a
b
cd A
BC
D
e Increase
Hold
Decrease
Wheel speed
Brake pressureActual vehicle speedEstimated vehicle speed