Wheel cylinder is the second important hydraulic brake
system. It consists of two pistons which can move in opposite directions by the
fluid pressure. It is rigidly mounted on the brake shield or backing plate. The
boots protect the cylinders from foreign substances. Bleeder valves are
provided in the cylinder to permit air and liquid to be pumped out of the
system during of the bleeding operation .
Piston cup fits tightly in the cylinder against each piston and seal themechanism against leakage of the brake fluid. A Spring serves to hold the
cups against the piston when the pressure is decreased.
When the brakes are applied the brake fluid enters the cylinder from a
brake line connection inlet between the two pistons. It causes to force out
the two pistons in opposite directions. This motion is transmitted to the brake
shoe. Directly or through links force them against the brake drum, thus
applying the brake.
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