Opel 1900 1973 Service Manual page 284

PISTON
BLEEDER VALVE
cups are of a special heat resisting rubber. The
inlet port for brake fluid is located between the
pistons so that when fluid pressure is applied,
both pistons move outward in the wheel cylin-
ders. The pistons impart movement to the brake
shoes of the rear wheel brakes by bearing directly
CYLINDER HOUSING
Figure 5C-47 Wheel Cylinder Exploded View
against the ends of the shoes. Rubber boots en-
close both ends of the cylinder to exclude foreign
matter. A valve for bleeding brake pipes and
wheel cylinder is located in the back of the cylin-
der casting and extends through the brake backing
plate assembly. See Figure 5C47.
DRUM BRAKES
SC-47