Dorman M101262 Brake Master Cylinder

Reliable Brake Master Cylinder for Buick, Chevrolet, Oldsmobile, and Pontiac

The Dorman M101262 Brake Master Cylinder is engineered to restore proper brake hydraulics in select Buick, Chevrolet, Oldsmobile, and Pontiac models. Designed with a cast iron body and an included reservoir, this master cylinder ensures consistent brake fluid delivery for safe and effective braking performance.

• Master cylinder bore diameter: 24 mm for precise hydraulic pressure
• Durable cast iron construction for long-lasting service
• Includes reservoir for brake fluid storage
• Two outlet ports with rearward outlet size 1/2-20 and secondary outlet thread diameter 9/16-18
• Package contains the master cylinder only; mounting hardware not included

Technical Details and Compatibility

The Dorman M101262 master cylinder features a 24 mm bore diameter, which is critical for maintaining the correct hydraulic pressure in the brake system. Its cast iron material provides strength and resistance to wear, suitable for the demands of brake hydraulics. The included reservoir allows for proper brake fluid containment and circulation. This master cylinder has two outlets: a rearward outlet sized 1/2-20 and a secondary outlet with a 9/16-18 thread diameter, ensuring compatibility with the brake lines on your vehicle.

This part is compatible with a range of vehicles including Buick Century, Chevrolet Malibu, Oldsmobile Cutlass Supreme, Pontiac Grand Prix, and others such as the El Camino, LeMans, Monte Carlo, Regal, Riviera, and Toronado. The Dorman M101262 is designed specifically for these models to meet factory specifications.

Common Applications and Problem Resolution

• Restores brake pressure loss due to worn or leaking master cylinder
• Eliminates spongy or unresponsive brake pedal feel
• Prevents brake fluid leaks that can cause system failure
• Addresses brake warning light issues related to master cylinder failure
• Replaces damaged or corroded master cylinders in older Buick, Chevrolet, Oldsmobile, and Pontiac vehicles

Installation Notes and Tips

• Ensure brake system is properly bled after installation to remove air
• Mounting hardware is not included; reuse existing hardware or source separately
• Verify outlet thread sizes (1/2-20 rearward, 9/16-18 secondary) match brake line fittings
• Inspect brake lines and hoses for wear during installation
• Follow vehicle-specific service manual instructions for master cylinder replacement

Quality Assurance and Warranty

Dorman manufactures the M101262 master cylinder to meet or exceed OEM standards for fit, form, and function. The cast iron construction and included reservoir are designed for durability and reliable brake system performance. While specific warranty details may vary, Dorman typically offers a limited warranty covering defects in materials and workmanship. Refer to Dorman’s warranty policy for complete information.