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5-36
1977 PONTIAC SERVICE MANUAL
WHEEL BOLT REMOVAL A N D
INSTALLATION
Disc Brakes
1. Remove hub and rotor assembly from car.
2. Mark rotor to hub location and remove 5 bolts
attaching hub to rotor.
3. The wheel bolts on disc brakes can be pressed out from
the outside of the hub and installed from inside the rotor by
pressing into place. No drilling or cutting is required.
4. Reinstall assembly and adjust wheel bearings.
DRUM BRAKES
REPLACE OR RELINE BRAKE SHOES
Removal and Inspecting
See warning page 5-1
1. Jack up car and remove wheel and brake drum (rear).
It may be necessary to back off the brake shoe adjustment
before the brake drums can be removed. T o back off shoe
adjustment, rotate shoe adjusting screw upward.
2. Unhook the primary and secondary shoe return
springs using large pliers.
3. Remove shoe hold down springs.
4. Lift up on actuator, unhook actuating link from
anchor pin, then remove.
5. Spread shoes to clear wheel cylinder connecting links,
remove parking brake strut and spring, disconnect cable from
parking brake lever, remove shoes from the backing plate.
6. Spearate the brake shoes by removing adjusting-screw
and lock spring. Remove parking brake lever and secondary
brake shoe.
7. Clean all dirt out of brake drum, using care to avoid
getting dirt into front wheel bearings. Inspect drums and
replace or recondition if required.
8. Clean all dirt from brake assemblies and inspect for
any unusual condition.
9. Wheel cylinders having torn, cut, or heat-cracked
boots should be completely overhauled.
Inspection for leakage may be accomplished at the boot
center hole after removal of link pin. Fluid coatings on piston
within cylinder and on end of link pin removed from boot
are normal, as cylinder contains a porous DUREX PISTON
WHICH IS IMPREGNATED WITH A CORROSION
INHIBITING FLUID. Fluid spilling from boot center hole,
after link pin is removed, indicates cup leakage and necessity
for completely over-hauling cylinder.
10. If working at rear wheels, inspect backing plate for
oil leak past wheel bearing oil seals. Correct any leak by
installation of new seals (Group 4).
11. Check all backing plate attaching bolts to make sure
they are tight. Using fine emery cloth, clean all rust and dirt
from shoe contact surfaces on plate.
Relining Brake Shoes
If old brake shoes are to be relined, inspect shoes for
distortion and for looseness between the rim and web, these
are causes for discarding any shoe. If shoes are serviceable,
be governed by the following points in installing new linings:
1. Remove old linings by drilling out rivets. Punching
rivets out will distort shoe rim. Thoroughly clean surface of
shoe rim and file off any burrs or high spots.
2. Use Pontiac brake lining or equivalent and the rivets
included in lining package which are of the correct size. The
rivets must fit the holes with the solid body of rivet extending
through the shoe rim, but no farther.
Keep hands clean while handling brake lining.
3. Start riveting at center of shoe and lining and work
toward the ends. Use a roll set for riveting, a star set might
split the tubular end and then the rivet would not fill the hole.
The primary lining is shorter than secondary lining;
therefore, the rivet holes at each end of the shoe rim are not
used.
4. After riveting is completed, lining must seat snugly
against shoe with no more than .005" separation midway
between rivets. Check with a
.004"
(go) and a .006" (No GO)
feeler gage.
Installation and Adjustment
1. Lubricate fulcrum end of parking brake lever with
Delco Brake Lubricant or equivalent, then attach lever to
secondary shoe. Make sure that lever is free moving.
2. Connect brake shoes together with adjusting screw
spring, then place adjusting screw in position. When
installing the adjusting screw spring and adjusting screw,
make sure the spring does not touch the starwheel portion
of the adjusting screw; and, also, when installing adjusting
screw, make sure right hand thread adjusting screw is on left
side of car and left hand thread adjusting screw is on right
side of car. Make certain starwheel lines up with adjusting
hole in backing plate.
3. Lubricate shoe contact surfaces on backing plate with
a thin coating of Delco Brake Lubricant or equivalent. On
rear brakes, sparingly apply same lubricant where brake cable
contacts backing plate.
4. Place brake shoes on backing plate, at the same time
engaging shoes with wheel cylinder links. The primary shoe
(short lining) goes toward front of car. On rear brakes,
connect cable to parking brake lever and install strut and
spring between lever and primary shoe. On B Series the right
side rear brake the strut spring installs between the lever and
the secondary shoe.
5. Install actuator, actuator return spring and actuating
link. If old brake shoe return springs are nicked, distorted or
of doubtful strength (discolored from heat), it is advisable to
install new parts.
6. Install shoe hold down springs.
7. Install the primary and secondary shoe return springs
using large pliers. Be careful not to distort springs.
8. Measure brake drum I.D. using inside caliper portion
of Tool J 21 177. Adjust brake shoes to dimension obtained
on outside caliper portion of Tool J 21 177.
9. Install brake drums and wheels.
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