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In addition, the caliper piston can also be moved out of its’ bore mechanically by a cable lever arrangement so this type of caliper can be used as a parking brake。 For this reason, the hydro-mechanical calipers are most commonly found in rear disc applications。 These calipers are expensive to manufacture and repair and the service procedures can be very difficult。 Careful study of the repair manual is required before attempting service on this type of disc brake。 Diagnosis of problems caused by brake calipers is straightforward。

If the inboard brake pad is worn thinner than the outboard pad it indicates a hydraulic problem that is holding pressure on the piston。 Look for: frozen pistons, defective hoses, plugged lines, or master cylinders that don’t return fully to the released position。 If the outboard pad is worn thinner than the inboard pad a mechanical defect that would prevent the caliper from sliding is indicated。 Areas of concern are: caliper guide pins, bushings, sleeves, support keys or other sliding suces。

If inspection reveals evidence of fluid inside the dust boot, the caliper seal is leaking and the caliper should be replaced。 If the dust boot is torn, the part of the piston between the seal and the boot will be rusted。 Pushing the piston back into the caliper will either cause the caliper piston to stick or damage the seal。Most wheel cylinders are small hydraulic cylinders that have pistons at each end。 Then the brakes are applied, hydraulic pressure forces the pistons outward and their motion is transmitted to the drum brake shoes through push rods。

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