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5 - 32
BRAKES
•
BENDIX DISC B R A K E
INDEX
Page
Page
, . 36
General Service Information
32
. 35
Rotor Inspection And Service
. 39
. 37
Rotor Installation . . . . . . . . . . . . . . . . . . . . . . . . . .
41
. 34
Rotor Removal ; . . .
40
Brakeshoe Installation
Brakeshoe Removal
. . . . . . . . . . . .
Caliper Overhaul
Disc Brake Inspection
GENERAL SERVICE INFORMATION
The Bendix disc b r a k e assembly is used o n W250/
350 models w i t h t h e D a n a 60 f r o n t axle (Fig. 1). The
assembly consists o f a single piston sliding caliper, a
m o u n t i n g adapter attached t o t h e steering k n u c k l e , a
ventilated rotor and a rotor splash shield. T h e splash
shield, w h i c h is bolted to t h e adapter, protects t h e
bearings a n d inboard surface o f the rotor from road
splash. The wheel protects t h e outboard surface o f
the rotor and brake assembly.
The caliper slides l a t e r a l l y on surfaces machined
into t h e caliper a n d m o u n t i n g adapter. T h e adapter
is bolted to t h e steering k n u c k l e (Fig. 2). T h e caliper
is positioned i n t h e adapter w i t h a support k e y and
spring (Fig. 1). A r e t a i n i n g screw is used t o secure
the support key.
The inboard brakeshoe i s mounted i n t h e caliper
adapter. The outboard brakeshoe is mounted i n t h e
caliper. The l i n i n g s are r i v e t e d t o t h e shoes, a n d t h e
inner and outer shoes are n o t interchangeable.
Fig. 1 Bendix Disc Brake Caliper
Fig. 2 Caliper Mounting Adapter Attachment
DISC BRAKE
OPERATION
The s i g n i f i c a n t feature o f single piston caliper op-
eration i s t h a t t h e caliper is free to move l a t e r a l l y on
the adapter slide surfaces (Fig. 3).
A t b r a k e application,
fluid
pressure is exerted
equally against t h e caliper piston and a l l surfaces o f
the caliper piston bore.
Pressure applied t o t h e piston is t r a n s m i t t e d d i -
rectly t o t h e i n b o a r d brakeshoe pressing the shoe l i n -
i n g against t h e rotor. A t t h e same t i m e , pressure
applied t o t h e caliper bore surfaces, causes t h e cali-
per t o slide i n w a r d l a t e r a l l y . T h e i n w a r d movement
presses t h e l i n i n g o f t h e outboard shoe against t h e
opposite side o f t h e rotor t o complete b r a k i n g action
(Fig. 3).
A n y a p p l i c a t i o n or release o f brake fluid pressure
causes o n l y a very modest movement o f the caliper
and piston. A t b r a k e release, t h e piston a n d caliper
r e t u r n t o t h e non-appled position. The brakeshoes do
not r e t r a c t a n y appreciable distance f r o m t h e rotor.
The m i n i m a l r u n n i n g clearance provides t h e i m -
proved response a n d reduced pedal t r a v e l ; I t also
helps i n p r e v e n t i n g d i r t a n d foreign m a t e r i a l from-
lodging between t h e shoe a n d rotor surfaces.
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