Rear wheel brake cylinder. This is an ATE product

Fits
All Beetle models including 1302 and 1303

Wheel brake cylinders are a part of the braking system, they are important to the overall safety of the vehicle.
If your vehicle is displaying any of the following symptoms, spongey brake pedal, poor brake response, or fluid leaking underneath the car by the wheels it could be a sign that the wheel cylinders have come to the end of their life and need replacing.