Dorman M39584 Brake Master Cylinder

Reliable Brake Master Cylinder for Select GM Vehicles

The Dorman M39584 Brake Master Cylinder is engineered to restore proper brake hydraulics in various Buick, Cadillac, Chevrolet, Oldsmobile, and Pontiac models. Designed with precision, this master cylinder ensures consistent brake fluid pressure for safe and responsive braking performance.

• Master cylinder bore diameter of 24 mm for accurate fluid displacement
• Durable aluminum construction for corrosion resistance and longevity
• Includes reservoir and sensor for integrated brake system monitoring
• Four outlet ports with specific thread sizes for secure brake line connections
• Compatible with multiple GM models including Buick Century, Chevrolet Cavalier, Pontiac Grand Am, and more

Product Details and Specifications

The Dorman M39584 master cylinder features a 24 mm bore diameter, crafted from aluminum to provide a lightweight yet robust component that withstands the demands of brake hydraulics. This unit comes complete with an integrated reservoir and sensor, allowing for seamless fluid level monitoring and brake system feedback. It includes four outlets with rearward outlet sizes of M11 x 1.5 and M13 x 1.5, and secondary outlet thread diameters of M10 x 1.0 and M12 x 1.0, ensuring compatibility with the brake lines on your vehicle. This master cylinder is designed specifically for select Buick, Cadillac, Chevrolet, Oldsmobile, and Pontiac models such as the Buick Century, Chevrolet Corsica, Pontiac Sunbird, and Cadillac Calais.

Compatible Vehicles and Applications

This brake master cylinder is compatible with a range of GM vehicles, including:

• Buick Century, Skylark, and Regal
• Cadillac Calais
• Chevrolet Cavalier, Corsica, Lumina APV, and Celebrity
• Oldsmobile Cutlass Calais, Cutlass Ciera, and Firenza
• Pontiac Grand Am, Sunbird, and Trans Sport

Common Brake System Issues Addressed

• Spongy or unresponsive brake pedal
• Brake fluid leaks from the master cylinder
• Brake warning light activation due to sensor faults
• Uneven brake pressure causing pulling or reduced stopping power
• Brake fluid reservoir damage or contamination

Installation Notes and Tips

When installing the Dorman M39584 master cylinder, ensure the brake system is properly bled to remove air and maintain hydraulic integrity. Verify that the outlet thread sizes match your vehicle’s brake lines for a secure fit. Since mounting hardware is not included, retain original fasteners or source compatible hardware. Check sensor connections carefully to maintain brake system monitoring functionality.

Quality Assurance and Warranty

Dorman manufactures this brake master cylinder to meet or exceed OEM specifications, using high-quality aluminum for durability and corrosion resistance. The included sensor and reservoir are designed for reliable operation within the brake hydraulic system. While specific warranty details are not provided here, Dorman products typically come with a limited warranty covering defects in materials and workmanship.