Brakes; Hydraulic Brakes - Chevrolet CHEVY VAN G10 SERIES Service Manual

General D escription ....................................................................... 5-1
M aintenance and A d ju s tm e n ts ....................................................5-3
Brake Inspection ............................................................................ 5 4
H ydraulic Brake F l u i d ............................................................. 5 4
Bleeding B r a k e s ..........................................................................5 4
Pressure M ethod .................................................................. 5 4
Manual M e th o d .....................................................................5-5
Hydraulic Brake L i n e s ............................................................. 5-6
Hoses ......................................................................................5-6
Tubing ................................................................................... 5-6
Brake Drum A djustm ent ........................................................ 5-8
Push Rod to Master Cylinder C le a ra n c e ............................. 5-9
Parking Brake ............................................................................ 5-9
Stop Lam p Switch A djustm ent ............................................ 5-9
All m odels are equipped w ith a split brake system . The
system is designed w ith a separate hydraulic system for the
fro n t and rear brakes using a dual m aster cylinder (Fig. 1 and
Fig. 2).
T he split system consists basically o f tw o separate brake
systems. When a failure is encou n tered on either, the o th e r is
adequate to stop the vehicle. I f one system is n o t functioning,
it is norm al for the brake pedal lash and pedal effo rt to
substantially increase. This occurs because o f the design o f the
m aster cylinder which incorporates an actuating piston for

BRAKES

The following caution applies to one or m ore steps in the assembly
procedure o f com ponents in this p o rtio n o f the m anual as indicated at
appropriate locations by the term inology " See C aution on page 1 of this
S ection" .
C A U T IO N : T H IS F A S T E R N E R IS A N IM P O R T A N T A T T A C H IN G P A R T
IN T H A T IT C O U L D A F F E C T T H E P E R F O R M A N C E O F V IT A L C O M ­
P O N E N T S A N D S Y S TE M S , A N D /O R C O U L D R E S U L T IN M A JO R RE
P A IR EX P E N S E . IT M U S T BE R E P L A C E D W IT H O N E O F T H E S A M E
P A R T N U M B E R OR W IT H A N E Q U IV A L E N T P A R T IF R E P L A C E M E N T
BEC OM ES N E C E S S A R Y . DO N O T USE A R E P L A C E M E N T P A R T O F
LESSER Q U A L IT Y O R
M U S T BE U S E D AS S P E C IF IE D D U R IN G R E A S S E M B L Y TO ASSU RE
PRO PER R E T E N T IO N O F T H IS P A R T .
CONTENTS OF THIS SECTION
H ydraulic Brakes ............................................................................ 5-1
Pow er B r a k e s ................................................................................. 5-26
Special Tools ................................................................................. 5-28

HYDRAULIC BRAKES

GENERAL DESCRIPTION
SECTION 5
S U B S T IT U T E D E S IG N . T O R Q U E
INDEX
Page
C om ponent Replacem ent ....................................................5-10
Drums, Shoes & Linings-Rear Brakes .........................5-10
A nchor P i n ..........................................................................5-13
Wheel C y l in d e r .................................................................. 5-13
Brake Drum S e rv ic in g ......................................................5-14
Shoes and Linings-Front Disc Brakes .........................5-15
Caliper O v e rh a u l................................................................5-19
Disc S e rv ic in g .....................................................................5-20
Master C y lin d e r.................................................................. 5-21
Brake C om bination V a l v e ...............................................5-23
Brake P e d a l..........................................................................5-24
Parking Brakes .................................................................. 5-25
Pedal .............................................................................. 5-25
C a b le s........................... j ................................................5-25
each system . When th e rear system loses fluid, its piston will
b o tto m against the fro n t piston. When the fro n t system loses
fluid, its piston will b o tto m on th e end o f the m aster cylinder
body. The pressure differential in one o f the system s causes an
uneven hydraulic pressure balance betw een the fro n t and rear
systems. The brake pipe d istribution and sw itch assembly or
com bination value, near the m aster cylinder, detects the loss
o f pressure and illum inates the brake alarm indicator light on
the in stru m en t panel. The pressure loss is felt at the brake
pedal by an apparent lack o f brakes for m ost o f the brake
V A L U E S
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C H E V Y V A N SH O P M A N U A L
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