lock MAZDA 626 1987 Workshop Manual

POWER BRAKE UNIT 1 1
76G11X-071
Disassembly Note
Front and rear shells
1. Secure the front shell studs in a vise after attach-
ing suitable nuts to them to prevent damage to the
studs.
2. Before separating the front and rear shell assem-
blies, make matching marks to be used in reas-
sembly.
3. Fit a wrench onto the rear shell studs; then fasten
two of them with suitable nuts.
4. Rotate the rear shell counterclockwise to unlock.
Caution
The rear shell is spring loaded; loosen it
carefully.
Retainer key
Depress the plunger rod fully; then remove the re-
tainer key.
86U11X-049
86U11X-050
Assembly Note
Application of Grease
Before assembly, coat the parts shown in the figure
with silicon grease.
(1) Entire surface of reaction disc
(2) Dust seal lip
(3) Push rod
(4) Diaphragm-to-shell contacting surfaces
(5) Power piston
(6) Valve plunger oil seal
Retainer key
1. Push down the plunger rod.
2. Align the groove of the valve plunger with the slot
of the power piston.
3. Insert the retainer key.
86U11X-051
11—31

1 1 POWER BRAKE UNIT
Diaphragm
Install the diaphragm to the power piston and plate.
Caution
Check that the diaphragm is well seated in the
groove.
86U11X-052
Rear shell assembly
Assemble the rear shell assembly; carefully guiding
the tube end of the power piston through the dust
seal of the rear shell.
86U11X-053
Front shell and rear shells
Press down the rear shell assembly, and rotate it
clockwise until the matching marks are aligned.
Caution
Fit suitable nuts to two studs of the rear shell
and tighten them to mount the wrench.
76G11X-072
INSPECTION
1. Inspect all rubber parts. Wipe free of fluid and care-
fully inspect all rubber parts for cuts, nicks, and
other damage.
2. Check the power piston for cracks,distortion, chip-
ping, and damaged seats.
3. Inspect the reaction disc rubber for deterioration.
4. Check that the seats of the valve rod and plunger
are smooth and free of nicks and dents.
5. Inspect the front and rear shells for scratches,
scores, pits, dents, and other damage.
6. Check the diaphragm for cuts and other damage.
11—32

1 1 FRONT DISC BRAKE
76G11X-073
86U11X066
76G11X-074
FRONT DISC BRAKE
SIMPLE INSPECTION OF DISC PAD WEAR
1. Loosen the front wheel lug nuts.
2. Jack up the front of the vehicle and support it with
safety stands.
3. Remove the wheels.
4. Look through the caliper inspection hole and check
that the remaining thickness of the pad is 2 mm
(0.08 in) min.
Note
When the remaining thickness becomes 2 mm
(0.08 in), the wear indicator informs that the
pad should be replaced by creating a squeal-
ing noise before any disc plate damage
occurs.
REPLACEMENT OF DISC PAD
Caution
Replace the left and right pads at the same
time.
1. Loosen the front wheel lug nuts.
2. Block the rear wheels firmly.
3. Jack up the front of the vehicle and support it with
safety stands.
4. Remove the wheels.
5. Remove the lower mounting bolt.
6. Pivot the caliper on the top bolt and support it.
7. Remove the V-springs.
Note
V-springs are equipped for non-asbesto pad
type.
8. Remove the pads and shims.
Warning (Asbesto pad type)
Asbestos dust is a health hazard. Do not blow
away brake dust with compressed air.
9. Apply the grease supplied in the pad attachment
set to the new shims, and attach them to the new
pads.
10. Push the piston inward with the SST and the old
pad.
11. Install the new pads and shims into the mounting
support.
12. Install the V-springs (non-asbesto pad type).
76G11X-075
11-40

REAR DISC BRAKE 1 1
REAR DISC BRAKE
SIMPLE INSPECTION OF DISC PAD WEAR
1. Loosen the rear wheel lug nuts.
2. Jack up the rear of the vehicle and support it with
safety stands.
3. Remove the wheels.
4. Look through the caliper inspection hole and check
that the remaining thickness of the pad is 1 mm
(0.04 in) min.
76G11X-082
86U11X-084
REPLACEMENT OF DISC PAD
Caution
Replace the left and right pads at the same
time.
1. Loosen the wheel lug nuts.
2. Release the parking brakes.
3. Jack up the rear of the vehicle and support it with
safety stands.
4. Remove the wheels.
5. Remove the parking brake cable from the cable
bracket and the operating lever.
6. Remove the upper mounting bolt; then pivot the
caliper.
7. Remove the V-springs.
8. Remove the pads and shims.
Warning
Asbestos dust is a health hazard. Do not blow
away brake dust with compressed air.
86U11X-085
86U11X-086
9. Apply the grease supplied in the pad attachment
set to the new shims; then attach them to the new
pads.
10. Turn the piston fully inward by rotating the SST
clockwise. Align the piston groove as shown in the
illustration.
Note
The piston groove and inner pad alignment pin
must be aligned when the inner pad is in-
stalled.
11. Install the pads and shims to the mounting support.
12. Install the pad clip.
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1 1 REAR DISC BRAKE
86U11X-087
86U11X-088
13. Lift the caliper assembly onto the mounting
support.
14. Tighten the mounting bolt to the specified torque.
Tightening torque:
16—24 Nm (1.6—2.4 m-kg, 12—17 ft-lb)
15. Connect the parking cable end to the operating
lever; then tighten the locknut.
Tightening torque:
20—28 N-m (2.0—2.9 m-kg, 14—21 ft-lb)
Caution
There must be no clearance between the ca-
ble end and the operating lever.
16. Mount the wheels.
17. Apply the brakes a few times; then check that the
brakes do not drag excessively while the wheels
are being rotated.
18. Lower the vehicles.
19. Tighten the wheel lug nuts.
Tightening torque:
88—118
N
m (9—12 m-kg, 65—87 ft-lb)
76G11X-083
11-48

1 1 REAR DISC BRAKE
DISASSEMBLY AND ASSEMBLY
1. Disassemble the caliper in the sequence shown in the figure, referring to disassembly note for spe-
cially marked parts.
2. Inspect all parts, referring to inspection note.
3. Assemble in the reverse order of disassembly, referring to assembly note for specially marked parts.
76G11X-0B5
1. Guide pin
2. Pin boot
3. Bushing
4. Retaining ring
5. Dust seal
6. Piston
7. Piston seal
8. Snap ring
9. Adjuster spindle
10. Stopper
11. O-ring
12. Connecting link
13. Return spring
14. Operating lever
15. Boot
16. Boot clip
17. Needle bearing
18. Cable braket
Disassembly Note
Piston
Remove the piston with the SST.
Note
The piston can be removed by turning the SST
counterclockwise.
86U11X-092
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REAR DISC BRAKE 1 1
86U11X-101
4. Move the operating lever and check that the ad-
juster spindle moves smoothly.
Piston
1. Clean the piston.
2. Install the dust seal in the piston groove.
3. Turn the piston into the caliper cylinder while rotat-
ing the SST clockwise.
Note
Turn the piston in fully, and align the piston
grooves as shown in the illustration.
4. Fit the dust seal into the caliper cylinder.
87U11X-102
11—53

REAR DISC BRAKE 1 1
INSTALLATION
1. Install in the reverse order of removal, referring to installation note for the specially marked parts.
2. Tighten all nuts and bolts to the specified torque, referring to torque specifications.
3. After installation:
(1) Add brake fluid and bleed air. (Refer to page 11—9.)
(2) Adjust the parking brake lever stroke. (Refer to page 11 —65.)
(3) Depress the brake pedal a few times and check that the rear brakes do not drag excessively
while the wheels are being rotated.
Note
Refer to page 11—47 for pad installation.
Torque specifications
1. Parking brake cable
Installation Note
Parking brake cable
Connect the parking brake cable end onto the oper-
ating lever; then fix it to the bracket by the locknut.
Caution
There must be no clearance between the ca-
ble end and the operating lever.
86U11X-107
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1 1 REAR DRUM BRAKE
REAR DRUM BRAKE
REMOVAL
1. Loosen the wheel lug nuts.
2. Release the parking brakes.
3. Jack up the rear of the vehicle and support it with safety stands.
4. Remove the wheels.
5. Remove in the sequence shown in the figure, referring to removal note for the specially marked parts.
Caution
Do not damage the wheel cylinder dust boots when removing the brake shoes.
86U11X-108
1. Hub cap
2. Locknut
3. Brake drum
4. Parking brake cable
5. Return spring
6. Dust cover
7. Return spring (upper)
8. Hold pin and spring
9. Brake shoe (leading side)
10. Return spring (lower)
11. Anti-rattle spring
12. Hold pin and spring
13. Brake shoe (trailing side)
14. Operating lever assembly
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REAR DRUM BRAKE 1 1
15. Brake pipe
16. Wheel cylinder assembly
86U11X-109
17. Gasket
18. Backing plate
Removal Note
Locknut
Uncrimp the locknut, and remove it.
Caution Do not reuse the locknut.
86U11X-110
Brake drum
If the drum is difficult to remove, push the operating
lever stopper (at backing plate) upward to release the
operating lever and increase shoe clearance.
86U11X-111
11-57