1989 MITSUBISHI GALANT Service Repair Manual

35-64SERVICE BRAKES - Service Adjustment Procedures
RUN-OUT CORRECTIONM35FTAB
1.If the run-out of the brake disc is equivalent to or exceeds
the limit specification, change the phase of the disc and hub, and then measure the run-out again.
(1) Before removing the brake disc, chalk both sides of the wheel stud on the side at which run-out is greatest.
14LOOB7
(2) Remove the brake disc, and then place a dial gauge asshown in the illustration; then move the hub in the axial
direction and measure the play.
Limit: 0.2 mm
(.008 in.)
If the play is equivalent to or exceeds the limit, disas-
semble the hub knuckle and check each part.
(3) If the play does not exceed the limit specification, and then check the run-out of the brake disc once again.Mount the brake disc on the position dislocated from
the chalk mark.
2.If the run-out cannot be corrected by changing the phase
of the brake disc, replace the disc or turn rotor with on the
car type brake lathe (MAD
DL-8700PF or equivalent).
THICKNESS CHECK
1.Using a micrometer, measure disc thickness at eight posi-
tions, approximately 45” apart and
10 mm (.39 in.) in from
the outer edge of the disc.
Brake Disc Thickness
Standard value: 24 mm (.94 in.)
Limit: 22.4 mm
(.882 in.)
Thickness Variation (At least 8 position)
The difference between any thickness measure-
ments should not be more than 0.015 mm
(.OOOS
in.).
2.If the disc is beyond the limits for thickness, remove it and
install a new one. If thickness variation exceeds the specifi-
cation, replace the disc or turn rotor with on the car type brake lathe (MAD, DL-8700PF
or equivalent).
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SERVICE BRAKES - Service Adjustment Procedures35-65’
14AO281
WA0204
grooves
Q
0 0
Projection
1410037I-
REAR DISC BRAKE PAD CHECK AND
REPLACEMENT
MBBFUAE
1. Check brake pad thickness through caliper body check port.
Limit: 2.0 mm
(.08 in.)
Caution
1.When the limit is exceeded, replace the pads at both
sides, and also the brake pads for the wheels on the
opposite side at the same time.
2.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, lock pin sleeve and
.guide pin sleeve.
2.Loosen the parking brake cable (from the vehicle interior),
and disconnect the parking brake end installed to the rear brake assembly.
3. Remove lock pin. Lift caliper assembly and retain with wires.
CautionDo not wipe off the special grease that is
on the lock
pin or allow it to contaminate the lock pin.
Remove the following parts from caliper support.
(1) Outer shim
(2) Pad assembly
(3) Pad clips
C
(4) Pad clips B
4.Measure hub torque with pad removed to measure brake
drag torque after pad installation.
NOT
E
To secure the disc to the hub, tighten the nuts.
5. Securely attach the pad clip to the caliper support.
Caution
Do not deposit grease or other dirt on pad or brake disc
friction surfaces.
6. Clean the piston; then use the special tool to thread the piston into the cylinder.
Be sure, at this time, that the stopper groove of the piston,
correctly fits to the projection on the pad’s rear surface.
7.Be careful that the piston boot does not become caught,
when lowering the caliper assembly and install the lock pin.
With the engine running, forcefully depress the brake pedal five or six times, and then check whether or not the
stroke of the parking brake lever is within the standard
value.
If there is a deviation from the standard value, adjust the
stroke of the parking brake lever.
(Refer to GROUP
36-Service Adjustment Procedures.)I) TSB RevisionI

35-66SERVICE BRAKES - Service
Adjustment Procedures
14AOO67
8. Check brake drag torque as follows.
(1) Start engine and hold brake pedal down for 5 seconds.
(2) Stop engine.
(3) Turn brake disc forward 10 times.
(4) Check brake drag torque with spring scale.
If the difference between brake drag torque and hub
torque exceeds the standard value, disassemble piston
and clean piston. Check for corrosion or worn piston seal,
and check the sliding condition of the lock pin sleeve and
guide pin sleeve.
Standard value: 70
N (15.4 Ibs.) or less
14 Nm (3 ft.lbs.)J or less
REAR BRAKE DISC THICKNESS CHECK
M35FVAB
1. Remove dirt and rust from brake disc surface.
2. Measure disc thickness at 4 locations or more.
Limit: 8.4 mm
(.331 in.)
Replace the discs and pad assembly for both sides left
and right of the vehicle if they are worn beyond the
specified limit.
REAR BRAKE DISC RUN-OUT
CHECKM35FWAB
1. Remove the caliper support, raise the caliper assembly, and secure it by using a wire, etc.
2. Place a dial gauge approximately 5 mm
(.2 in.) from the
outer circumference of the brake disc, and measure the run-out of the disc.
Limit: 0.08 mm
(.0031 in.)
NOT
E
To secure the disc to the hub, tighten the nuts.
REAR BRAKE DISC RUN-OUT CORRECTIONMFXAA
1.If the run-out of the brake disc is equivalent to or exceeds
the limit specification, change the phase of the disc and
hub, and then measure the run-out again.
NOTE
The procedures for checking by changing the installation
phase of the disc are the same as those for the front brake
discs. (Refer to
P.35-64.)
2.If the problem cannot be corrected by changing the phase
of the brake disc, replace the disc.
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SERVICE BRAKES - Service Adjustment Procedures35-67
BRAKE LINING THICKNESS CHECKM35FlAA
1. Remove the brake drum.
2.Measure the wear of the brake lining at the place worn the
most.
Limit:
1.0 mm (.04 in.)
Replace the shoe and lining assembly if brake lining
thickness is less than the limit and/or if it is not worn
evenly. For information concerning the procedures for installation of the shoe and lining assembly, refer to
P.35-108.
Caution
1.Whenever the shoe and lining assembly is replaced,
replace both RH and LH assemblies as a set to
prevent car from pulling to one side when braking.
2.If there is a significant difference in the. thicknesses
of the shoe and lining assemblies on the left and
right sides, check the sliding condition of the piston.
BRAKE DRUM INSIDE DIAMETER CHECK
Remove the brake drum.
M3!5FJAA
Measure the inside diameter of the hub and drum at two or
more locations.
Limit: 205 mm (8.1 in.) Replace brake drums and shoe and lining assembly when wear
exceeds the limit value or is badly
imbalanced.
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IlAR0170 1
14K664
BRAKE LINING AND BRAKE DRUM CONNECTION
CHECKM35FFAA
1. Remove the brake drum.
2. Remove the shoe and lining assembly. (Refer to
P.35-108.)
3.Chalk inner surface of brake drum and rub with shoe and
lining assembly.
4.Replace shoe and lining assembly or brake drums if very
irregular contact area.
For information concerning the procedures for installation
of the shoe and lining assembly, refer to
P.35-108.
NOTE
Clean off chalk after check.

35-68SERVICE BRAKES - Service Adjustment Procedures
A.B.S. warning light
Ignition switch
sT;!i;%
lARD175
Filter4
kR
14A0171
ANTI-LOCK BRAKING SYSTEM (A.B.S.) CHECK
(CHECKING BY THE A.B.S. WARNING LIGHT)
M35FOAK
By following the procedures described below, check whether
the system is good or not by checking the illumination and non-illumination of the A.B.S. warning light.
(1) Check to be sure that the A.B.S. warning light illuminates
when the ignition key is turned to the ON position, and
that it again illuminates two times during a short period of
time (approximately 0.5 second) after the engine is started, and that it then stops illumination.
(2) After checking that the A.B.S. warning light does not illuminate during a period of approximately 2 minutes
while the engine is left idling, test drive at a vehicle
speed of approximately 30 km/h (18.6 mph) or more for
about 30 seconds or longer and check that the A.B.S.
warning light does not illuminate during that time.
(3) If any abnormal condition is discovered during steps (1) and (2) above, check the system by following the anti-
skid brake system troubleshooting procedures.
Caution
Before checking the anti-lock braking system by the
A.B.S. warning light as described above, first check
the ordinary brake system that there are no problems
such as leakage of the brake fluid, incorrect connec-
tions of the brake tubes, etc.
WHEEL SPEED SENSOR OUTPUT VOLTAGE
CHECK
M3sFoAE
(1) Jack up the vehicle and release the parking brake.
(2) Disconnect the electronic control unit harness connector,
and measure the speed sensor output voltage at the
vehicle side harness connector.
(3) Rotate the wheel to be measured at a speed of about
one-
half to one rotation per second and while doing S
O
measure the speed sensor output voltage by using a
voltmeter or oscilloscope.
(4) If an oscilloscope is used, use the filter shown in the
figure at the left.
Speed sensor1-1 Standard value
1 Front left15-4 (22-4 I50 mV or more 1IIIII
IFront rightI1 23-21 1 23-21 1IIIII1 Rear right1 24-26 1 24-26 1II IIIIII Rear left( 7-9 18-9 1IIII1
NOTE
1. A voltmeter with AC mV range indication should be used
for measurement.
2. When disconnecting the adaptor from the body harness connector, attach a cord to the male connector and then
pull to disconnect.
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SERVICE BRAKES - Service Adjustment Procedures35-69
(5) The probable cause if the output voltage is 50 mV or lower, or if the one-side deflection width of the
oscilloscope’s waveform is 70
mV or lower
Probable causes Remedy
Excessive clearance between the speed sensor pole
piece and rotor Adjust to the standard value.
Foreign material attached to the speed sensor pole
pieceRemove the foreign material.
Damaged speed sensor pole pieceReplace the speed sensor.
Damaged rotor teeth~~~ rReplace the rotor.
Loose speed sensor or rotor installation bolt I
Tighten to the specified torque.
1
NOTE
The speed sensor internal resistance and harness side are normal.
Caution
It is conceivable, because the movement of a speed-sensor cable “foll\
ows” the movement of the front
or rear suspension, that the damaged wiring condition may be apparent on\
ly during travel on poor
road surfaces, and may be normal on better road surfaces. Therefore, whe\
n measuring the output
voltage of a speed sensor, recheck the condition of the cable connection\
s by removing the clamp and pulling the cable and bending it near the clamp position in order to che\
ck for the existence of damaged
wiring.
1/21314j51617)61Q~10~11~12)13~14~15)16~17~1~~19~20~21~22~23~24~25~26(27~26~2Q~30(31~32~33~34~35~
Check connector
74=f=n
ECU
*
Body harnessMB991 356fl 14N018C
MEASUREMENT OF WHEEL SPEED SENSOR
OUTPUT VOLTAGE
IWSFOAQ
1. Lift up the vehicle and release the parking brake.
2. Disconnect the ECU harness connector and measure with the adapter harness (MB991
356) connected to the harness
side connector.
Caution
1. Never insert a probe, etc. into the connector as it
may result in poor contact later.
2.Do not connect the connector (Special Tool) marked
with u*nexcept when recording the waveform on a
driving test. In such a case, connect the connector
to the ECU.
Terminal No. (same for AWD and
FWD)
FL
RR FRRL
4
24218
5
2623 . 9
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35-70SERVICE BRAKES- Service Adjustment Procedures
I, ! I ! I4 IO II IIWhen turned manually :---;---i-.-l---L--.I 8 ! IaI 1 11 1 II ’I 1’ I I I;-;--1---:--‘---+---t---i ’I IL---)-.-i---+--.II ’ I I 1 , 1 ,I
--:--~---;---:---~--~--
POINTS IN WAVEFORM MEASUREMENT
3. Manually turning the wheel to be measured by
l/2 to 1
turn/second, measure the output voltage with a circuit
tester or oscilloscope. Output voltage: When measured with circuit tester: 70
mV or more
When measured with oscilloscope (max. voltage): 100
mV or more
Probable causes of low output voltage
0 Speed sensor pole piece-to-rotor clearance too large
l Faulty speed sensor
4. Then, in order to observe the output state of the wheel
speed sensors, shift into low gear
(AWD vehicle) and drive
the wheels, observe the output voltage waveform of each
wheel speed sensor with an oscilloscope.
In the case of the FWD vehicle, observe the waveform with
an oscilloscope; for the front wheels, shift into low gear and
drive the wheels; for the rear wheels, turn the wheels manually at a constant speed.
NOTE
1.Waveform may also be observed by actually driving the
vehicle.
2.The output voltage is low when the wheel speed is low
and increases as the wheel speed increases.
Symptom
Too small or zero waveform amplitude Probable causes
Faulty wheel speed sensor Remedy
Replace sensor
Incorrect pole piece-to-rotor clearanceAdjust clearance
Waveform amplitude fluctuates Axle hub eccentric or with large runoutReplace hub
excessively (this is no problem if
the minimum amplitude is 100 mVor more)
Noisy or disturbed waveformOpen circuit in sensor Replace
sensor
Open circuit in harness
Correct harness
Incorrectly mounted wheel speed sensorMount correctly
Rotor with missing or damaged teeth Replace rotor
NOTEThe wheel speed sensor cable moves following motion of the front or rear\
suspension. Therefore, it is likely that it
has anopen circuit only when driving on rough roads and it functions normally \
on ordinan/ roads. It is, therefore, recommended
to observe sensor output voltage waveform also under special conditions,\
such as rough road dnvlng.
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INSPECTION OF HYDRAULIC UNIT
INSPECTION BY FEEL
(1) Jack up the vehicle and support the vehicle with rigid racks
placed at the specified jack-up points.
(2) Release the parking brake and determine the drag force(drag torque) of each wheel by feel.
(3) Set the scan tool through the adapter harness
(MB991 377)
as illustrated.
(4) After confirming that the shift lever or selector lever is in the neutral position, start the engine.
The ABS warning light lights up, it goes into the scan tool mode. In the scan tool mode, ABS does not function.
I

SERVICE BRAKES - Service Adjustment Procedures35-71
(5) Operate the scan tool to force the actuator to operate (item
No.04, 05, 06).
(6) Turning the wheel manually, check the change of thebraking force when the brake pedal is depressed.
The change should be as shown in the following illustration.
NOTE
While the ABS is in the fail safe mode, the scan tool actua-
tor test cannot be made.
Pressure decrease
-Pedaloperation Depress
Release
Drag force whenpedal is released Scan tool actuator
/test start
I
1 3sec. y
Pedal operation
Pedal operationpattern @pattern @
//r”-“““““----
I
I
I
I--m-e- e-m- --------_---------d
16 sec.
14FOOS6
(7) If any abnormality is found in the check, take corrective
action according to the following “Judgement in Inspectionby Feel” table:
Judgement in Inspection by Feel 05'
FL VALVEM
06”Rear VALVEM”
Operation
(1) Depress brake pedal to
lock wheel.
(2)Using the scan tool,
select the wheel to be
checked and force the
actuator to operate.
(3)Turn the selected wheelmanually to check the
change of brake force. Judgement
Normal
Brake force
released for 6
seconds after
locking. Abnormal
Wheel does not lock when
brake pedalis depressed.
Brake force is
not released Probable
cause
Clogged brake /JII
other than
Clogged hy-
draulic circuit
in HU
Incorrect HU
brake tube
connection
HU solenoid
valve not
functioningcorrectly Remedy
Check and
clean brake
line
Replace HUassembly
Connect
correctly
Replace HUassembly
NOTEl : FWD
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