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5 - 20
BRAKES
•
POWER B R A K E B O O S T E R — B R A K E P E D A L
INDEX
Page
Booster Installation . . . . . . . . . . . . . . . . . . . . . . . .
21
Booster Removal
20
Page
Brake Pedal Removal/Installation
. 21
General Information
20
GENERAL INFORMATION
Power brakes are s t a n d a r d o n a l l A D models. A
single or t a n d e m d i a p h r a g m , v a c u u m power brake
booster is used.
D a n d W100/150 models are equipped w i t h a 250
m m (9.84 i n ) , single d i a p h r a g m booster u n i t (Fig. 1).
D and W250/350 models are equipped w i t h a 200 m m
(7.87 i n ) , t a n d e m (dual) d i a p h r a g m booster.
The booster u n i t consists of a single housing d i -
vided i n t o separate chambers b y one or two i n t e r n a l
diaphragms. The outer edge o f the diaphragm is se-
cured t o t h e housing. T h e booster push rod, w h i c h
connects t h e booster t o t h e brake pedal and master
cylinder, i s attached t o t h e center o f the diaphragm.
A check valve is used i n the booster outlet connected
to the engine i n t a k e m a n i f o l d . Power assist is gener-
ated u t i l i z i n g a c o m b i n a t i o n o f vacuum and atmo-
spheric pressure to boost brake assist.
RESERVOIR
T h e p o w e r b r a k e booster i s n o t a r e p a i r a b l e
component. T h e booster m u s t b e r e p l a c e d a s a n
a s s e m b l y i f diagnosis i n d i c a t e s a m a l f u n c t i o n
h a s o c c u r r e d .
A suspended-type brake pedal is used for a l l a p p l i -
cations. T h e pedal is attached to t h e pedal support
bracket w i t h a pivot shaft. The pedal, b o l t a n d bush-
ings are a l l serviceable components.
BOOSTER REMOVAL
(1) Disconnect v a c u u m hoses f r o m booster check
valve.
(2)
Remove nuts a t t a c h i n g master
cylinder t o
booster a n d move cylinder away f r o m booster.
(3) Inside vehicle, remove clip t h a t secures booster
push rod t o brake pedal (Fig. 1). Use screwdriver t o
p r y clip off pedal pivot p i n .
(4) Remove locknuts f r o m booster m o u n t i n g studs.
PEDAL SHAFT
MASTER CYLINDER
AND BOOSTER ASSEMBLY
TIGHTENING TORQUE
(AS 200 IN.-LBS. (23 N-m)
V >
35 IN.-LBS. (4 N-ffi)
LOCKNUT
RK721
Fig. 1 Power Brake
Booster
And Pedal Mounting
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