Disc Brakes - Opel 1900 1973 Service Manual

DESCRIPTION AND OPERATION:
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . * . . . . . . . . . . . . . . . . . .
DIAGNOSIS:
Disc Brake Trouble Diagnosis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MAINTENANCE AND ADJUSTMENTS:
Disc Brake Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Checking Disc Brake Friction Pads for Wear . . . . . . . . . .
Replacing Friction Pads
Checking Brake Disc for Lateral Runout
MAJOR REPAIR:
Removing and Installing Brake Caliper . . . . . . . . . . . . . . . . . . . . . .
Removing and Installing Brake Disc . . . . . . . , . . . . . . . . . . . . . . . . . .
Removing and Installing Brake Disc Shield . . . . . . . . . . . . . .
Disassembly and Assembly of Brake Caliper . . . . . . . . . .
SPECIFICATIONS:
Disc Brake Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DESCRIPTION AND OPERATION
DESCRIPTION
The front wheel disc brake consists of two major
parts: The brake disc and the brake caliper with the
two friction pads. See Figure 5B-20.
The brake disc is attached to the inside of the wheel
hub flange by four bolts and centered on a shoulder
of the hub. The brake caliper consists of two halves:
the mounting half, arranged on the inside of the
brake disc, and the rim half. The two halves are
firmly attached to each other by four bolts. Two
flanges on the mounting half serve as attachment of
the brake caliper to the steering knuckle. The brake
caliper is positioned behind the front suspension
cross member at steering knuckle spindle level. It is
attached to the steering knuckle by two bolts. Both
caliper halves act as brake cylinders and each houses
a piston and a fluid seal. The fluid seal, of square
cross section, is positioned in an annular groove of
the caliper bore, preventing fluid leakage past the
piston and entry of water and dirt. The pistons and
caliper half bores are protected against entry of water

DISC BRAKES

CONTENTS
Subject
Figure 58.20 Left Front Disc Brake Assembly
and dirt in brake disc direction by a rubber seal, held
on the caliper half collar by a clamp ring and against
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