Dorman M390148 Brake Master Cylinder

Reliable Brake Master Cylinder for Chevrolet and Toyota Models

The Dorman M390148 brake master cylinder is engineered to restore proper brake hydraulics for Chevrolet Paseo, Toyota Prizm, and Toyota Tercel vehicles. Designed with precision, this aluminum master cylinder includes a reservoir and sensor to ensure consistent braking performance.

• Master cylinder bore diameter: 0.875 inches for accurate hydraulic pressure
• Durable aluminum construction for corrosion resistance and longevity
• Includes reservoir and sensor for integrated brake fluid management
• Two outlet ports with rearward outlet size M10 x 1.0 and thread pitch 1.0
• Secondary outlet thread diameter of 10 mm for secure brake line connections
• Package contains the master cylinder unit; mounting hardware not included

Product Details and Specifications

The Dorman M390148 brake master cylinder is crafted from aluminum, providing a lightweight yet durable component essential for brake hydraulics. Its 0.875-inch bore diameter is designed to deliver precise hydraulic pressure to the braking system. This master cylinder comes with an integrated reservoir and sensor, allowing for efficient brake fluid monitoring and management. Featuring two outlets, including a rearward outlet sized M10 x 1.0 with a 1.0 thread pitch, it supports secure and reliable brake line connections. The secondary outlet thread diameter is 10 mm, ensuring compatibility with the brake system fittings on Chevrolet Paseo, Toyota Prizm, and Toyota Tercel models.

Compatible Vehicles and Applications

This brake master cylinder is compatible with the following vehicles:

• Chevrolet Paseo
• Toyota Prizm
• Toyota Tercel

It is designed to replace the original master cylinder in these models, restoring proper brake hydraulic function and safety.

Common Issues Addressed by This Master Cylinder

• Brake pedal sinking or sponginess due to internal leaks
• Brake fluid leaks from a worn or damaged master cylinder
• Inconsistent brake pressure affecting stopping performance
• Warning lights triggered by faulty brake fluid sensors
• Brake system failure caused by a malfunctioning reservoir or sensor

Installation Notes and Tips

• Ensure the brake system is properly bled after installation to remove air
• Verify compatibility with your vehicle’s brake line fittings before installation
• Mounting hardware is not included; reuse existing hardware or source separately
• Handle brake fluid carefully to avoid contamination and damage to painted surfaces
• Consult vehicle service manual for torque specifications and installation procedures

Quality Assurance and Warranty

Dorman manufactures the M390148 brake master cylinder to meet or exceed OEM standards for fit, form, and function. The aluminum construction and integrated sensor contribute to reliable brake system performance. While specific warranty details are not provided here, Dorman products typically come with a limited warranty covering defects in materials and workmanship. Refer to Dorman’s official documentation for complete warranty information.