2008 MITSUBISHI LANCER EVOLUTION X Workshop Manual

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-6
VARIABLE BOOST RATIO MECHANISM
The variable boost ratio mechanism changes the input/output
characteristics of the brake booster in two phases by changing
the reaction force applied to the valve plunger during the assist
phase.
.
AT INITIAL ASSISTING
1. When the brake pedal is not depressed (no input load
applied), the reaction washer is not deformed.
2. When the brake pedal is depressed, the reaction washer is
deformed to reach the ring piston and disc, then the first
input characteristics begin (Ratio 1).
.
AT AN INCREMENT OF ASSIST RATIO
1. The reaction washer is further deformed and pushes down
the ring piston and lock washer, deflecting the spring. All the
force pushing the ring piston and disc is transferred to the
brake pedal via spring seat and disc as the reaction force.
2. The reaction washer is then further deformed, and when the
lock washer makes contact with the control housing, the
input characteristics change. All the force applied from the
reaction washer to the ring piston is now transferred to the
control housing via the lock washer, so no force is applied to
the brake pedal. The second input characteristics (Ratio 2)
begin.
AC507766AB
Disc
Reaction
washer
Ring piston
AC507768AB
Valve
piston Spring
seat Spring
Lock washer
AC507769AB
Reaction
washer
Ring piston
Control
housing
Lock washer

CONSTRUCTION DESCRIPTION
BASIC BRAKE SYSTEM35A-7
BRAKE PEDALM2350007000422
The brake pedal retreat suppression mechanism that
restraints the retraction of the brake pedal surface
during a frontal collision has been adopted in order to
reduce the shock to the driver's feet.When the brake booster is crushed rearward by the
engine retreat during a frontal collision, the installa
-
tion surface of the brake pedal is retreated. In this
case, the end of the pedal support is forcibly slid
down and back by the interference with the slope
mounted on the front deck crossmember assembly.
At the same time, the linkage comprised of the pedal
support, pedal arm, and push rod moves the brake
pedal pad surface forward.
AC611958AB
Pedal support frame
position before collision
Collision loadPedal retreat
path in collision
Brake booster
Brake pedal and support
memberSlopeBrake pedal and support
member
Slope
After the breakage
mechanism operates
Pedal support frame position after
collision Brake booster
Pedal arm
Push
rodPush
rod
Pedal arm

CONSTRUCTION DESCRIPTION
BASIC BRAKE SYSTEM35A-8
FRONT BRAKEM2350003000602
Brakes with the following specifications have been
adopted for the front brakes.
•The 1-piston ventilate disc brake (V5-S57 cles with 16-inch wheel> or V6-S57 with 18-inch wheel>) has been adopted.
•An audible wear indicator that informs the driver
of application limit has been adopted onto the
front brake LH pads.
•The outer disc type brake disc which can be tight-
ened together with the wheel has been intro-
duced for better serviceability.
.
DISC BRAKE DESIGNATION
AC609316
AC201769
Wear indicator Brake discPad Normal
AB
At wear limit
<15-inch disc brake (V5-S57)>
<16-inch disc brake (V6-S57)>
No.ItemContents
1Brake disc typeV: Ventilated
S: Solid
2Brake size
(Minimum applicable
disc wheel)
4: 14"
5: 15"
6: 16"
3Number of pistonsS: 1 (Floating type)
4Piston size
(Rounded integral
value)
35: φ 34.9 mm
57: φ 57.1 mm
V 6 - S 57
1 2 3 4
AC505124

CONSTRUCTION DESCRIPTION
BASIC BRAKE SYSTEM35A-9
REAR BRAKEM2350004000616

8-inch leading trailing-type drum brakes have been
adopted for the rear brakes in order to provide stable
braking force at all times both when moving forward
and reverse.

Brakes with the following specifications have been
adopted for the rear.
•The 1-piston solid disc brake (S4-S35 with 16-inch wheel> or S6-S35 18-inch wheel>) has been adopted.
*
•An audible wear indicator that informs the driver
of application limit has been adopted onto the
brake pads.
•The outer disc type brake disc which can be tight-
ened together with the wheel has been intro-
duced for better serviceability.
NOTE: *For the brake disc name, refer to FRONT
BRAKE
P.35A-8.
AC609282
AC609315
AC201769
Wear indicator Brake discPad Normal
AB
At wear limit
<16-inch disc brake (S6-S35)> <14-inch disc brake (S4-S35)>