URO 93035255302 Disc Brake Caliper Piston Seal - Rear

Rear Brake Caliper Piston Seal for Porsche 911

This URO disc brake caliper piston seal is a direct-fit replacement for the rear brake system on 1978-1989 Porsche 911 models with a 38mm caliper piston. It addresses worn sealing surfaces that can affect brake performance and pedal feel. Part number 93035255302 is built to OE-style dimensions for proper sealing and low-friction operation.

Key Features

• Fits 1978-1989 Porsche 911, rear, 38mm
• OE-style profile and durometer for correct sealing
• Low-friction operation to support smooth caliper movement
• High-quality material resists intense braking heat
• Replaces hardened or cracking original piston seals
• URO part number 93035255302

Detailed Description

Built for rear brake service on the Porsche 911, this caliper piston seal is intended to restore the sealing interface inside the caliper when the original seal has aged, hardened, or begun to crack. The OE-style shape and material hardness help maintain proper hydraulic sealing while supporting consistent piston movement during braking. This URO 93035255302 seal is a practical choice for Porsche 911 rear brake rebuild work where correct fitment and heat resistance matter.

This part cross-references URO-007630 for the same application.

What It Helps Fix

• Brake fluid seepage at the caliper piston seal
• Cracked or hardened rear caliper seals
• Uneven caliper piston return after braking
• Loss of sealing integrity in a rebuilt rear caliper
• Brake performance issues caused by worn seal material

Installation Notes and Tips

Confirm the rear caliper piston size is 38mm before installation. Clean the caliper bore thoroughly and inspect the piston for scoring, corrosion, or wear before reassembly. Use proper brake assembly procedures and fresh brake fluid during service. Verify seal seating and system operation after installation.

Quality Assurance

URO lists this seal with guaranteed fitment, high-quality materials, and a 24-month unlimited mileage warranty. It is made to replace the original piston seal with an OE-style sealing profile suited for brake heat and regular service use.