Pontiac tempest 1968 Service Manual page 172

S T A N D A R D BRAKES
5 - 7
REAR CABLE ASSY
VIEW A
\
C O N N E C T O R
VIEW F
VIEW C
Fig. 5 - 8 Pontiac Parking Brake System
8. Remove the primary to secondary shoe spring
and the adjusting screw,
9. On rear brakes, remove the parking brake lever
from the secondary shoe.
INSPECTION AND CLEANING
1. Inspect brake drums for scoring. Road dirt
frequently cuts grooves in drums which do not im­
pair operation of brakes unless grooving is extremely
severe. When drums are badly scored, inspect brake
shoe linings carefully for imbedded foreign material.
Replace or recondition only if drums are badly
scored.
CA UTION: Removing material from brake drum
reduces the strength of the drum and also its abil­
ity to transfer heat. Never remove more than is
absolutely necessary and in no case remove more
than 0.030" (increasing diameter by 0.060'% After
a drum is turned, be sure it is free of all metal
particles. Whenever a drum is turned, the drum
on the opposite side should also be turned. If the
drum diameter is less than 0.030 n oversize
(11.030") after refinishing, standard linings may be
installed. If drum diameter is 11.030-11.060",
oversize linings must be installed.
NOTE: If new linings are installed on one wheel,
they must also be installed on the opposite side of
the car.
2. Inspect front wheel bearings and oil seals and
replace as necessary.
3. Inspect linings for wear or cracks. Clean brake
shoes, drums and backing plates, removing any for­
eign particles that may have become imbedded in
lining surface. Examine shoes for loose rivets which
must be replaced. Install new shoes or reline if lin­
ings are badly burned or worn nearly flush with
rivets or if linings show evidence of oil, grease or
brake fluid on the surface.
4. Carefully pull wheel cylinder links out of the
boots. Excessive fluid at this point indicates leakage
past piston cups.
NOTE: A slight amount of fluid is nearly always
present and acts as lubricant for the piston.
5. If an excessive amount of fluid is present, over­
haul wheel cylinder. See Hydraulic System.
6. Clean inner surfaces of brake backing plates
and all shoe contacting points. Apply a small amount
of petroleum base lubricant to pads where brake
shoes contact backing plates.
7. Clean exposed portions of parking brake cables.
8. Disassemble the adjusting screw assembly and
inspect as follows: