Wheel Brake Cylinder, Front Right Upper. Porsche 356A / 356B 1950-65  ❭  69535151200

The Porsche Wheel Brake Cylinder 69535151200 is a replacement hydraulic brake cylinder used in the front right upper position of the drum-brake system on selected classic Porsche 356 models.

Fits:

• Porsche 356A 1955-59
• Porsche 356B 1959-63  

As a critical hydraulic braking component, correct cylinder condition is essential for consistent braking force, balanced front braking and dependable pedal response.

What This Product Does:
When the driver presses the brake pedal, the master cylinder generates hydraulic pressure in the brake-fluid circuit.

This pressure reaches the wheel brake cylinder, where internal pistons move outward and apply force to the brake shoes.

The wheel brake cylinder helps:

• Convert hydraulic brake pressure into mechanical braking force
• Push the front brake shoes against the brake drum
• Generate braking force at the front wheel
• Maintain consistent hydraulic operation
• Support balanced braking across the front axle
• Maintain predictable brake-pedal response
• Allow the brake shoes to release correctly when pedal pressure is removed

It is an essential part of the original drum-brake system.

Symptoms Of Wear Or Failure:
Common symptoms of a failing wheel brake cylinder include:

• Brake-fluid leakage around the brake drum
• Wetness behind the brake backing plate
• Brake fluid on the brake shoes
• Soft or spongy brake pedal
• Brake pedal requiring additional travel
• Reduced braking performance
• Vehicle pulling to one side under braking
• Uneven front braking
• One wheel braking more strongly than the other
• Wheel cylinder pistons sticking or seizing
• Brake shoes failing to apply correctly
• Brake shoes failing to release fully
• Uneven brake-shoe wear
• Low brake-fluid level
• Repeated need to top up brake fluid
• Corrosion or pitting inside the cylinder bore

Any unexplained loss of brake fluid should be investigated immediately.

Why Replacement Matters:
The wheel brake cylinder is a safety-critical component.

A leaking or seized cylinder can reduce braking force at the affected wheel and upset the braking balance across the front axle.

Continued operation with a failing cylinder can contribute to:

• Increased stopping distance
• Unpredictable vehicle behaviour under braking
• Loss of brake fluid
• Air entering the hydraulic system
• Brake-shoe contamination
• Accelerated brake-component wear
• Reduced pedal firmness
• Partial loss of braking performance

Replacing a worn cylinder restores proper hydraulic sealing and piston movement.