Saab 95 1967, Service Manual

Page: 436 / 610

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S7076
MASTERCYLINDER
AS FROM CHASSIS NO.
96722017571 AND 95722006475 RHD
FRONT WHEEL BRAKE
The front wheels are equipped with disc brakes with only
one cylinder.
The principal parts of this brake are the support bracket,
brake body assembly, cylinder body and friction pad as‘
semblies.
The support bracket, which is bolted to the steering
knuckle housing, keeps the brake in place and transmits
the
braking forces to the knuckle housing.
The brake body assembly is fitted to the support bracket
by means of a hinge pin and a friction unit. It is thus mov—
able in relation to the support bracket, the torsional cen-
tre being provided by the hinge pin.
The brake cylinder has an outer wiper seal, which pre
vents the entry of dust, and an inner fluid wal.
The friction pad assemblies consist of frictional material
which is glued to a pressure plate. The friction pads are
wedgeshaped in order to compensate for the irregular
wear which occurs on account of the movement taking
place around the hinge pin. The outer friction pad is
mounted in the brake body assembly whereas the inner
pad rests against the brake piston and is held in position
by the support bracket and the brake body assembly.
The hydraulic pressure is built up in the master cylinder
and is transmitted to the brake cylinder. The pressure ac-
tuates the brake piston, causing this to move outwards
and press the friction pad against the brake disc. The mov-
able brake unit is then influenced, so that the outer frio
tion pad is also pressed against the brake disc.
When the piston is being pressed outwards in the cylinder,
a certain resilience occurs in the piston seal which sur-
rounds the piston. This springiness is sufficient to pull
the piston back when the hydraulic pressure decreases.
thus providing a clearance between the friction pad and
the disc. The outer friction pad is moved back on account
of the movement of the brake body assembly in relation
to the support bracket. Wear on the brake linings is com
pensated for automatically, as the brake piston moves
outwards by means of the seal.
2 3
5 mo
FRONT AXLE ASSEMBLY WITH DISC BRAKE
1. Brake disc 3. Brake housing
2. Wheel hub 4. Brake pads
SAD h 1979