URO 91135501112 Brake Master Cylinder

Porsche 911 Brake Master Cylinder

This URO brake master cylinder is a direct-fit replacement for classic Porsche 911 brake hydraulics. It is built to OE dimensions for proper clearance and pedal performance, with EPDM piston seals that resist glycol-based brake fluid.

Key Features

• Fits 1977-1989 Porsche 911, N/A
• OE-dimensioned brake master cylinder for correct fit and function
• EPDM piston seals resist corrosion from glycol-based brake fluid
• Aluminum or cast iron cylinder construction for durability
• Quality control performed throughout production
• Part number 91135501112 for direct identification

Detailed Description

URO 91135501112 is a brake master cylinder for Porsche 911 models from 1977 through 1989. It is manufactured to OE dimensions to maintain proper clearances in the brake hydraulic system and support consistent pedal response. The cylinder body uses high-quality alloy aluminum or cast iron construction, depending on application, and the internal seals are made from EPDM for compatibility with standard glycol-based brake fluid. This part cross-references 911 355 011 11 and 911 355 011 12 for the same application.

Common Brake System Issues It Can Address

• Brake fluid leaking into the pedal area or onto carpeting
• Soft, inconsistent, or sinking brake pedal feel
• Internal master cylinder seal wear causing hydraulic pressure loss
• Brake warning concerns related to master cylinder leakage
• Restoration or maintenance of Porsche 911 brake hydraulics

Installation Notes and Tips

Before installation, inspect the brake lines, reservoir connections, and surrounding hydraulic components for contamination or wear. Bleed the brake system thoroughly after replacement to remove trapped air and restore proper pedal feel. Verify that the application matches your Porsche 911 year and brake configuration before installation.

Quality Assurance

URO Parts manufactures this master cylinder with production-stage quality control and backs it with a 24 Month Unlimited Mileage Warranty. The part is engineered for guaranteed fitment on listed Porsche 911 applications.