Chevrolet 10 Series 1970 Service Manual page 260

BRAKES 5-22
F ig . 39 —In s ta llin g P ull Back Springs Using Tool J -2 2 3 4 8
12. If old brake pull back (retu rn ) springs a re nicked,
distorted, o r i f strength is doubtful, in sta ll new
springs.
13. Hook springs in shoes using T o ol J-8049 by installin g
the p rim a ry sprin g fro m the shoe o v e r the anchor
pin and then spring fro m secondary shoe o v e r the
w ire link end.
14. P r y shoes away fr o m the backing plate and lubricate
shoe contact su rfa ces with a thin coating o f brake
lube.
CAUTIO N: Be ca refu l
fa cin g s .
15. A fte r com pleting installation, make certain the actu­
ator le v e r functions e a s ily by hand operating the
self-ad ju stin g featu re.
F ig . 4 0 —B acking P late C o n ta c t Surfaces
to keep lubricant o ff
F ig . 4 1 —Using D ru m -to -B ra k e C le a ra n c e G auge
16. F o llow the above procedu re fo r a ll brakes.
17. Adjust the s e rv ic e brakes as outlined below , then
adjust the parking brake.
Adjustment
Although the brakes a re s e lf adjusting a p relim in a ry o r
in itia l adjustment may be n ecessary a fter the brakes have
been relin ed o r replaced, o r whenever the length o f the
adjusting screw has been changed.
is made by using the s e lf adjusting feature.
1. With brake drum off, disengage the actuator fro m the
star wheel and rotate the star wheel by spinning o r
turning with a sm all screw d r iv e r .
Recommended M ethod of Adjustm ent (Figs. 4 1 -4 2 )
a. Use sp ecia l T o o l J-21177 o r J-22364, Drum to
B rake Shoe C learance
F ig . 4 2 —C h e c k in g Brake Shoe L in in g C le a ra n c e Using Tool J -2 1 1 7 7
The fin al adjustment
Gauge, to check the
CHEVROLET TRUCK SERVICE MANUAL