How a car works

All partsBMW M4 CSLWheel assembliesRear left wheel › Caliper pistons

Caliper pistons

Part of Rear left wheel · about $160 to replace

What it is

Pistons inside the caliper.

What it does

Convert hydraulic pressure into clamping force.

How it fails

Corrosion behind the dust seal seizes them.

MaterialStainless steel, titanium heat shields
Spec1 piston
Caliper pistons highlighted on the car

Appears at

Rear left wheelRear right wheel

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