Page 1179 of 1500
ON-VEHICLE SERVICE
BASIC BRAKE SYSTEM35A-14
BRAKE PEDAL FREE PLAY
1. Turn the ignition switch to the "LOCK" (OFF) position, and
depress the brake pedal two or three times. After eliminating
the vacuum in the brake booster, press the pedal down by
hand, and confirm that the amount of movement before
resistance is met (free play) is within the standard value
range.
Standard value: 3
8 mm (0.12 0.31 inch)
2. If the brake pedal play is not within the standard value,
check the following, and adjust or replace if necessary:
Excessive play between the brake pedal and the clevis pin,
or between the clevis pin and the brake booster operating
rod
Brake pedal height
Installation position of the stop light switch, etc.
CLEARANCE BETWEEN BRAKE PEDAL AND
DASH PANEL
1. Turn up the carpet, etc. under the brake pedal.
2. Start the engine, depress the brake pedal with
approximately 500 N (112 pounds) of force, and measure
the clearance between the brake pedal and the dash panel.
Standard value: 110 mm (4.33 inches) or more [From
the surface of dash panel to the face of pedal pad]
3. If the clearance is outside the standard value, check for air
trapped in the brake line and check the thickness of the disc
brake pad. Andjust and replace defective parts as required.
4. Return the carpet etc. to its original position.
BRAKE BOOSTER OPERATING TESTM1351001000372
1. For simple checking of the brake booster operation, carry
out the following tests:
(1) Run the engine for one or two minutes, and then stop it. If
the pedal depresses fully the first time but gradually
becomes higher when depressed succeeding times, the
booster is operating properly. If the pedal height remains
unchanged, the booster is defective. Go to step 2.
Page 1182 of 1500
ON-VEHICLE SERVICE
BASIC BRAKE SYSTEM35A-17
BRAKE FLUID LEVEL SENSOR CHECKM1351009100403
The brake fluid level sensor is in good condition if there is no
continuity when the float surface is above "MIN" and if there is
continuity when the float surface is below "MIN".
DISC BRAKE PAD CHECK AND REPLACEMENTM1351002300398
NOTE: Uneven wearor tapering of brake pad may be caused
by either caliper piston not operating correctly .
Whenever a pad must be replaced, replace both LH and
RH wheel pads as a set to prevent the vehicle from pull-
ing to one side when braking.
If there is a significant difference in the thicknesses of
the pads on the left and right sides, check the sliding
condition of the piston and slide pins.
1. Check the brake pad thickness through the caliper body
check port.(Rear). Front pad check can be viewed from rotor
side.
Standard value: 10.0 mm (0.39 inch)
Minimum limit: 2.0 mm (0.08 inch)
Page 1184 of 1500
ON-VEHICLE SERVICE
BASIC BRAKE SYSTEM35A-19
3. Remove the following parts from the caliper support.
(1) Pad assembly
(2) Clip
4. In order to measure the brake drag force after pad
installation, measure the rotary-sliding resistance of the hub
with the pads removed (Refer to P.35A-30).
5. Install the pads and caliper assembly, and then check the
brake drag force (Refer to P.35A-30).
6. Tighten lock pin bolt. Ensure lock pin is held with spanner
while tightening lock pin bolt(Rear) to specified torque.
DISC BRAKE ROTOR CHECKM1351002900334
Disc brakes must be kept within the allowable
service values in order to maintain normal brake
operation.
Before turning the brake disc, the following condi-
tions should be checked.
Page 1185 of 1500
ON-VEHICLE SERVICE
BASIC BRAKE SYSTEM35A-20
.
BRAKE DISC THICKNESS CHECK
1. Using a micrometer, measure disc thickness at eight
positions, approximately 45 degrees apart and 10 mm (0.4
inch) in from the outer edge of the disc.
FRONT BRAKE DISC
Standard value: 26.0 mm (1.02 inches)
Minimum limit: 24.4 mm (0.96 inch)
REAR BRAKE DISC
Standard value: 10.0 mm (0.39 inch)
Minimum limit: 8.4 mm (0.33 inch)
NOTE: Thickness variation (at least 8 positions) should not
be more than 0.015 mm (0.0006 inch). INSPECTION ITEM REMARK
Scratches, rust, saturated lining materials and wear
If the vehicle is not driven for a long period of
time, sections of the discs that are not in contact
with the pads will become rusty, causing noise
and shuddering.
If grooves and scratches resulting from excessive
disc wear are not removed prior to installing a new
pad assembly, there will be inadequate contact
between the disc and the lining (pad) until the
pads conform to the disc.
Run-out Excessive run-out of the discs will increase the pedal
depression resistance due to piston kick-back.
Change in thickness (parallelism) If the thickness of the disc changes, this will cause
pedal pulsation, shuddering and surging.
Inset or warping (flatness) Overheating and improper handling while servicing
will cause warping or distortion.
Page 1189 of 1500
BRAKE PEDAL
BASIC BRAKE SYSTEM35A-24
BRAKE PEDAL
REMOVAL AND INSTALLATIONM1351003400406
Post-installation Operation
Brake Pedal Adjustment (Refer to P.35A-13).
REMOVAL STEPS
1. BRAKE BOOSTER PIN
2. BRAKE BOOSTER PIN ASSEMBLY
3. SHIFT LOCK CABLE CONNECTION
4. STOPLIGHT SWITCH CONNECTOR
5. STOPLIGHT SWITCH
6. BRAKE PEDAL CLIPWIRING HARNESSES CLAMPED
ON BRAKE PEDAL ASSEMBLY
7. BRAKE PEDAL BOLT
8. BRAKE BOOSTER NUT
9. BRAKE PEDAL ASSEMBLY
10. BRAKE PEDAL PAD
11. BRAKE PEDAL STOPPERREMOVAL STEPS (Continued)
Page 1196 of 1500
DISC BRAKE ASSEMBLY
BASIC BRAKE SYSTEM35A-31
INSTALLATION SERVICE POINT
.
>>A<< BRAKE DRAG FORCE CHECK
1. In order to measure the brake drag force, measure the hub
torque with the pads removed by the following procedure.
Use a spring scale to measure the hub torque in the forward
direction. Record hub torque with pads removed.
Do not let any oil, grease or other contamination get onto
the friction surfaces of the pads and brake discs.
2. After re-installing the caliper support to the knuckle, install
the pad clips and the pads to the caliper support.
3. Clean the piston and insert into cylinder with special tool
MB990520.
4. Be careful that the piston boot does not become caught,
when lowering the caliper assembly and installing the lock
pin bolt.
5. Check the brake drag force as follows.
(1) Start the engine and hold the brake pedal down for 5
seconds. [Pedal depression force: approximately 200 N
(45 pound)]
(2) Stop the engine.
(3) Turn the brake disc forward 10 times.
Page 1197 of 1500
DISC BRAKE ASSEMBLY
BASIC BRAKE SYSTEM35A-32
(4) Use a spring scale to measure the hub torque with pads
installed in the same direction as earlier.
(5) Calculate the drag force of the disc brake [difference
between hub torque with pads installed and hub torque
with pads removed].
Standard value:
3.8L engine> 64 N (14 pounds) or less
54 N (12 pounds) or less
6. If the brake drag force exceeds the standard value,
disassemble and clean the piston. Check for corrosion or
worn piston seal, and check the sliding condition of the lock
pin and guide pin.
INSPECTIONM1351008100046.
BRAKE DISC CHECK
Disc wear (Refer to P.35A-19).
Disc run-out (Refer to P.35A-19).
Page 1198 of 1500
