Disc Brakes; Lining Inspection; Shoe And Lining Replacement; Caliper - Pontiac Grand Prix Service Manual

DISC BRAKES
CONTENTS OF THIS SECTION
SUBJECT PAGE SUBJECT PAGE
. . . . . . . . . . . . . . . .
Lining Inspection 5E
-
1
Shoe and Lining Replacement
. . . . . . . . .
5E- 1
. . . . . . . . . . . . . .
Caliper
-
Remove. 5E-1
. . . . . . . . . . .
Cleaning and Inspection 5E
-
1
. . . . . . . . . . . . . . .
Caliper
-
Install 5E-2
Caliper
-
Overhaul
. . . . . . . . . . . . . . .
5E-3
Caliper
-
Remove
. . . . . . . . . . . . . .
5E-3
Caliper
-
Disassemble
. . . . . . . . . . . .
5E-3
Cleaning and Inspection
. . . . . . . . . . .
5E
-
5
Caliper
-
Assemble
. . . . . . . . . . . . .
5E-6
Caliper
-
Install
. . . . . . . . . . . . . . .
5E-6
LINING INSPECTION
Inspect the brake linings any time that the wheels are
removed (tire rotation, etc.). Check both ends of the
outboard shoe by looking in at each end of the caliper
(Fig. 5E-2). These are the points at which the highest
rate of wear normally occurs. However, at the same
time, check the lining thickness on the inboard shoe to
make sure that it has not worn prematurely. Look
down. through the inspection hole in the top of the
caliper to view the inboard shoe. Whenever the
thickness of any lining is worn within 1/8" of of the
metal shoe, all shoe and lining assemblies on the axle
set should be replaced (Fig. 5E-3).
Bleeding Disc Brakes
. . . . . . . . . . . .
5E-6
Brake Rotor
-
Remove and Replace
. . . .
5E-6
Rotor Service
. . . . . . . . . . . . . . . . .
5E -7
Lateral Runout Check.
. . . . . . . . . . .
5E-7
Parallelism Check
. . . . . . . . . . . . .
5E-7
Surface Tolerance and Finish
. . . . . . .
5E-7
Proportioning Valve.
. . . . . . . . . . . . .
5E-8
Removal and Installation.
. . . . . . . . .
5E-8
Specifications
. . . . . . . . . . . . . . . . .
5E
-
9
Torque Specifications
. . . . . . . . . . . .
5E -8
Special Tools
. . . . . . . . . . . . . . . . .
5E-9
4. Remove the two mounting bolts which attach the
caliper to the support bracket (Fig. 5E-4).
NOTE: It is not necessary to disconnect the brake hose
for shoe and lining replacement.
5. Lift the caliper off the rotor using equal force on
each end to prevent it fibm binding at the mounting
bracket flanges. Do not force caliper if it becomes
cocked. Dislodge both shoes and position the caliper
on the front suspension arm so that the brake hose will
not support the weight of the caliper.
6. Transfer the inboard shoe anti-rattle spring to the
new shoe and lining assembly.
NOTE: Wheel must be removed to inspect lining.
7. Using hand pressure, push the sleeves from the
SHOE AND LINING REPLACEMENT
inboard ears of the caliper. Next, remove the rubber
bushings from the grooves in each of the four caliper
CALIPER
-
REMOVE
1. Remove two thirds of the total fluid capacity from
the front master cylinder reservoir. This may be done
by breaking the front line connection at the master
cylinder and bleeding down the fluid level. Do not
remove the brake line or completely empty the
reservoir or it will be necessary to bleed the hydraulic
system. Discard
--
do not attempt to reuse
--
the brake
fluid removed.
NOTE: Removal of the fluid is necessary to prevent
reservoir overflow when the caliper piston is pushed back
in its bore during lining replacement.
2. Raise the car and remove the wheel covers and
wheel assemblies.
ears (Fig. 5E-5). &card these parts, new ones i r e
provided with new linings.
I
CLEANING AND INSPECTION
Thoroughly clean the holes and the bushing grooves in
the caliper ears. Wipe all dirt from the mounting bolts.
Do not use abrasives on the bolts since this will
damage the plating. If the bolts are corroded or
damaged, they must be replaced.
Examine the piston boot for evidence of fluid leakage.
If leakage is noted, the caliper should be overhauled.
(See Caliper
-
Overhaul.) Wipe the inside of the
caliper clean, including the exterior of the dust boot.
Check the boot for cuts, cracks or other damage.
Make
sure that the boot is properly engaged in the groove in
the piston and also in the caliper counter-bore (Fig.
5E-6).
3. Using hand pressure, move caliper outboard as far CAUTION: Do not use compressed air to clean the
as possible. This will push the piston to the bottom of
inside of the caljper since this
may
cause the dust bod to
the piston bore. become unseated.