MPA Electrical NM55646 Brake Master Cylinder

Brake Master Cylinder for Tacoma

Restore consistent brake pedal feel with this MPA Electrical brake master cylinder for Toyota Tacoma models equipped with front disc brakes. Part number NM55646 is a new, standard replacement unit built with an aluminum body, plastic reservoir, and DOT 3 fluid compatibility for direct hydraulic service.

MPA Electrical’s New with front disc brakes line focuses on replacement brake hydraulics for specific vehicle applications. This NM55646 master cylinder is tested against OE specifications using controlled processes and sample-based validation to help deliver proper braking performance from the start.

Key Features

• Fits 2009-2023 Toyota Tacoma, N/A, with front disc brakes
• Brake master cylinder for hydraulic brake system service
• Aluminum master cylinder body with plastic reservoir
• 0.815 bore diameter for application-specific brake response
• Reservoir, cap, and gasket/seal included
• Standard replacement grade for direct repair work
• DOT 3 brake fluid type
• Part number NM55646

Detailed Description

This brake master cylinder is engineered for Toyota Tacoma trucks in the 2009-2023 range with front disc brakes. It is a direct hydraulic replacement for worn or leaking master cylinders and is built with a 2-hole mounting pattern, 0.354 mounting hole diameter, and an aluminum housing paired with a plastic reservoir. The unit includes the reservoir, cap, and gasket/seal, while the brake booster, push rod, mounting hardware, sensor, brake pressure switch, and mounting bracket are not included. Cross-reference part numbers include 4720104150 and 4720104170 for the same application. NM55646 is a practical choice when servicing a Tacoma brake system that needs restored pedal pressure and reliable fluid control.

Common Problems This Part Can Address

• Low or sinking brake pedal
• External brake fluid leakage at the master cylinder
• Uneven or inconsistent hydraulic pressure
• Brake pedal travel that feels excessive
• Loss of braking performance caused by internal seal wear

Installation Notes and Tips

Bench bleed the master cylinder before installation to reduce trapped air in the hydraulic circuit. Verify the vehicle uses front disc brakes and confirm bore size, mounting pattern, and reservoir configuration before installation. Use fresh DOT 3 brake fluid and inspect the brake lines, booster interface, and related hydraulic components for wear or contamination during service.

Quality Assurance

MPA Electrical tests each brake master cylinder against OE specifications using proprietary procedures and strict validation protocols. That process helps ensure consistent braking performance out of the box for Toyota Tacoma applications. Part number NM55646 is a new replacement component built for standard brake system service.