1989 MITSUBISHI GALANT Service Repair Manual

35-56SERVICE BRAKES - Service Adiustment Procedures
Pressurew-wPressure
Proportioning valve momi
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Split point ,,s*”
I’
I’
,’Outpur,’
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pressure
izl
Input pressure
14uoo55
PROPORTIONING VALVE FUNCTION TEST M~KKAK
1.Connect two pressure gauges, one each to the input side
and output side of the proportioning valve, as shown.
2.Bleed the air from the brake line and the pressure gauge.
3. While gradually depressing the brake pedal, make the following measurements and check to be sure that themeasured values are within the allowable range.
(1) Output pressure begins to drop relative to input pressure (split point).
Standard value:

ii:
3.95-4.45 Mpa (561-633 psi)
4.95-5.45 Mpa
(704-775 psi)
cl991 models>
FWD-SOHC3.95-4.45 Mpa (561-633 psi)
FWD-DOHC3.45-3.95 Mpa (491-561 psi)
AWD4.95-5.45 Mpa (704-775 psi)
(2) Ou;x~; fluid pressure when input fluid pressure are as
Standard value:
< 1989 models>
FWD5.15-5.65 Mpa (732-804 psi)
[at 8.2 Mpa (1,163 psi)] <1990, 1990.5 models>
FWD
5.55-6.05
Mpa (789-861 psi)
[at 8.2 Mpa (1,163 psi)]
AWD 6.55-7.05
Mpa (931- 1,003 psi)
[at 9.2 Mpa (1,309 psi)]

FWD-SOHC 5.55-6.05
Mpa (789-861 psi)
[at 8.2 Mpa (1,163 psi)]
FWD-DOHC4.65-5.15 Mpa (661-732 psi)
[at 7.7 Mpa (1,095 psi)]
AWD6.55-7.05 Mpa (931-1,003
psi)
[at 9.2 Mpa (1,309 psi)]
(3) Output pressure difference between left and right brake lines
Limit: 0.4
MPa (57 psi)
4. If the measured pressures are not within the permissible ranges, replace the proportioning valve.
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SERVICE, BRAKES - Service Adjustment Procedures35-57

4
1
2314AQ456

FWD
Delay valve L
flc ’
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i1
L
3
14AO4l
mit
14RD120
AWD
51
6 2414AO4E
BLEEDING M35FYAM
Because the master cylinder employed is the type without the
check valve, air should be bled from the master cylinder by
following the procedures described below (if there is no brake
fluid in the master cylinder).
(1) Disconnect the brake tube from the master cylinder.
(2) Two persons’ should conduct the air bleeding, one person
slowly depressing the brake pedal and holding the pedal
depressed.
(3) In this condition, the other person should use a finger to close the outlet part of the master cylinder, and then the
first person should release the brake pedal.
(4) Steps (2) and (3) should be repeated three or four times, and then the master cylinder should be filled with brake
fluid to the specified level.
I(]OTE
The air is completely bled from the master cylinder by
steps (1) to (4).
(5) Connect the brake tube to the master cylinder.
(6) Start the engine; then, in the sequence shown in the illustration, bleed the air from each wheel cylinder, delay
valve and hydraulic unit.
Specified brake fluid: Confoming to DOT3 or DOT4
Caution
1.Use the specified brake fluid. Avoid using a mixture
of the specified brake fluid and other fluid.
2. If brake fluid is exposed to the air, it will absorb moisture; as water is absorbed from the atmo-
sphere, the boiling point of the brake fluid will
decrease and the braking performance will be
seriously impaired. For this reason, use a hermeti-
cally sealed 1 dms (1.06 qt.) or 0.5 dms (0.52 qt.)
brake fluid container.
3. Firmly close the cap of the brake fluid container
after use.
4. For vehicles with the anti-lock braking system, be
sure to install a filter to the master cylinder
reservoir tank when supplying brake fluid.
NOTE
For FWD-vehicles with the anti-lock braking system, the
brake pedal will have a “heavier” feeling for air bleeding of
the rear brakes than for the front brakes, but this is the
result of the constriction of fluid pressure within the delay
valve, and is not a malfunction.
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35-58SERVICE BRAKES - Service Adjustment Procedures
14*ooat
Delay
valve Bleeder screw
(for the left rear brakes)i
Bleeder screw
I.LOO.1lheck valve bolt20-25 Nm (14-18 ft.lbs.)
ORDINARY AIR-BLEEDING PROCEDURES
(1) Depress the brake pedal several times until resistance is
felt; then, with the pedal depressed, loosen the bleederscrew
113 to l/2 turn and then tighten it before the fluid
pressure is all gone.
(2) Release the brake pedal. Repeat this procedure until there
are no more air bubbles in the brake fluid.
AIR BLEEDING FROM DELAY VALVE
4WD-ABS>
(1) Return the check valve bolt of the delay valve by about one turn and then bleed the air by following the steps
described above in “Ordinary air-bleeding procedures”.
Caution
There is a delay valve bleeder screw for the left rear
wheel brake and for the right rear wheel brake, ensure
the correct one is used.
(2) Be sure to tighten the check valve bolt at the specified
torque after completing the air bleeding.
AIR BLEEDING FROM HYDRAULIC UNIT A.B.S. >
(1) Attach the brake bleeder wrench to the bleeder screw.
(2) Using an offset (box) wrench 114 mm (55 in.)], loosen the
bleeder screw.
Caution
Use an offset (box) wrench to open and close the
bleeder, not a spanner wrench, because a spanner
wrench might cause deformation of the hexagonal part.
(3) Bleed the air by following the steps described above in “Ordinary air-bleeding procedures”.
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SERVICE BRAKES - Service Adjustment Procedures35-59
14 LO169
FRONT DISC BRAKE PAD CHECK AND REPLACE-
MENT 1990 models>M36FQAG
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. Remove lock pin. Lift caliper assembly and retain with wires.
Caution
Do not wipe off the special grease that is on the lock
pin or allow it to contaminate the lock pin.
3. Remove the following parts from caliper support. (1) Shim holder
(2) Inner shim
(3) Pad assembly
(4) Outer shim
(5) Pad clips
B
(6) Pad clips C
Cl989 models>< 1990 models>
(6)MAO523
14AOO361
4. Measure hub torque with pad removed to measure brake drag torque after pad installation.
NOTE
Tighten the nuts in order to secure the disc to the hub.
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35-60SERVICE BRAKES - Service Adjustment Procedures
Pad assembly
\
l4RO367
IWhen newWhen wornI
PadWea 5. Securely attach the pad clip to the caliper support.
6. Apply a coating of the specified grease to the pad, shim
and shim holder installation surfaces, and then install the
shim and shim holder.
Apply the grease so that the grease doesn’t ooze out from
the edges.
Specified grease: Brake grease SAE 5310,
NLGI No. 1
Caution
Do not deposit grease or other dirt on pad or brake disc
friction surfaces.
7.Be careful that the piston boot does not become caught,
when lowering the caliper assembly and install the lock pin.
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 IO 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 the 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
[4 Nm (3 ftlbs.)]
or less
FRONT DISC BRAKE PAD CHECK AND
REPLACEMENT Y35FaAH
NOTE
The brake pads have been equipped with wear indicators, so
that when the brake pad thickness reached 2 mm
(.08 in.), the
wear indicator touches the brake discs and produces a warning
squeaking sound.
Brake disc

SERVICE BRAKES - Service Adjustment Procedures35-61
ICM-R44V, M-R46V>
MAO563
14AOO23
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 on
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 and guide
pin.
2. Remove guide pin. Lift caliper assembly and retain with
wire.
Caution
Do not wipe off the special grease that is on the guide
pin or allow it to contaminate the guide pin.
3. Remove the following parts from caliper support.


14Lo293(414N0284
(1) Pad and wear indicator assembly
(2) Pad assembly
(3) Outer shim
(4) Pad clips
(5) Inner shim
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35-62SERVICE BRAKES - Service Adjustment Procedures
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II
I
Pad
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bly
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4. With the pad removed, use a spring balance to measure
the rotation sliding resistance of the hub in the forward di-
rection.
NOTE
Tighten the nuts in order to secure the disc to the hub.
5.Securely attach the pad clip to the caliper support.
6.Clean piston and insert into cylinder with tool.
7. Be careful that the piston boot does not become caught, when lowering the caliper assembly and install the guide
pin.
8.Apply repair kit grease to both sides of the inner shims.
Specified grease: Brake grease SAE 5310,
NLGI No.1
Caution
1. Make sure that the friction surfaces of pads and
brake discs and free of grease and other contami-
nants.
2.The grease should never squeeze out from around
the shim.
9.Check the disc brake drag force as follows.
(1) Start the engine, and after depressing the brake pedal hard two or three times, stop the engine.
(2) Turn brake disc forward
10 times.
(3) Use a spring balance to measure the rotation sliding re- sistance of the hub in the forward direction.
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hevision

SERVICE BRAKES - Service Adjustment Procedures35-63
(4) Calculate the drag torque of the disc brake (difference
between measured values in 3 and 4).
Standard value: 70 N (15.4 Ibs.) or less
10. If the disc brake drag force exceeds the standard value,
disassemble piston and clean the piston. Check for corro-
sion or worn piston seal, and check the sliding condition of
the lock pin and guide pin.
Front Disc Brake Rotor Inspection
CAUTION
When servicing disc brakes, it is necessary to exercise caution to keep \
the disc brakes within the allowable service values in order to maintain normal brake operation.
Before re-finishing or re-processing the brake disc surface, the followi\
ng conditions should be checked.
Inspection items
Scratches, rust, saturated lining materialsand wear
Run-out or drift
Change in thickness (parallelism) Inset or warping (flatness) Remarks
lIf the vehicle is not driven for a certain period, the sections of the d\
iscs
that are not in contact with lining will become rusty, causing noise and\
shuddering.
lIf grooves resulting from excessive disc wear and scratches are not re-
moved prior to installing a new pad assembly, there will momentarily
be inappropriate contact between the disc and the lining (pad).
Excessive run-out or drift of the discs will increase the pedal depressi\
on
resistance due to piston knock-back.
If the thickness of the disc changes, this will cause pedal pulsation, s\
hud-dering and surging.
Overheating and improper handling while servicing will cause inset orwarping.
RUN-OUT CHECKM35F5AB
1.Remove the caliper support; then raise the caliper assem-
bly upward and secure by using wire.
2.Inspect the disc surface for grooves, cracks, and rust. Clean
the disc throughly and remove all rust.
3. 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:

Up to 1991 models
0.08 mm (.0031 in.)
From 1992 models
0.07 mm (.0028 in.)

*1989 models
0.10 mm (.0039 in.)
Up to 1991 models 0.08 mm
(0031 in.)
From 1992 models 0.07 mm
(.0028 in.)
NOTE
Tighten the nuts in order to secure the disc to the hub.
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