Wheel cylinder Drum brake

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cut-away section of wheel cylinder.


one wheel cylinder operates brake on each wheel. 2 pistons operate shoes, 1 @ each end of wheel cylinder. leading shoe (closest front of vehicle) known primary shoe. trailing shoe known secondary shoe. hydraulic pressure master cylinder acts on piston cup, pushing pistons toward shoes, forcing them against drum. when driver releases brakes, brake shoe springs restore shoes original (disengaged) position. parts of wheel cylinder shown right.







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