MPA Electrical NM55405 Brake Master Cylinder

Brake Master Cylinder for Reliable Pedal Response

MPA Electrical NM55405 is a new brake master cylinder built as a standard replacement for vehicles with front disc brakes. It is engineered to restore hydraulic braking performance with a 0.875-inch bore, aluminum housing, plastic reservoir, and included cap, gasket, and seal.

For drivers searching for a brake master cylinder for Toyota applications, NM55405 provides a direct replacement option that supports consistent pedal feel and dependable fluid pressure. This part cross-references 5110054G60 and 5110054G61 for the same application.

Key Features

• Brand: MPA Electrical
• Part number: NM55405
• Brake master cylinder for front disc brake applications
• Standard replacement grade
• 0.875-inch master cylinder bore diameter
• Aluminum master cylinder body with plastic reservoir
• Reservoir, cap, gasket, and seal included
• Uses DOT 3 or DOT 4 brake fluid
• Two mounting holes with 0.353-inch mounting hole diameter
• New condition

Product Details

MPA Electrical’s New with front disc brakes product line focuses on replacement brake hydraulics for restoring OE-style braking performance. NM55405 is built from OE sample references and tested to match OE specifications, helping ensure proper hydraulic operation after installation. This brake master cylinder is a practical choice for Toyota brake repair work where the original master cylinder has worn seals, internal bypass, or inconsistent pedal pressure.

Use NM55405 when servicing a Toyota brake master cylinder application that requires a 0.875-inch bore and DOT 3 or DOT 4 fluid compatibility. The aluminum construction and included reservoir assembly support a clean replacement on front disc brake systems.

Common Problems This Part Addresses

• Low or sinking brake pedal
• Internal fluid bypass in the master cylinder
• Brake fluid leaks at the master cylinder body or seals
• Uneven or inconsistent hydraulic brake pressure
• Loss of braking response after master cylinder wear

Installation Notes and Tips

Before installation, confirm bore size, mounting hole spacing, reservoir style, and fluid specification against the original unit. Bench bleed the master cylinder before connecting brake lines, then bleed the full hydraulic system after installation. Replace contaminated brake fluid and inspect the booster, lines, and wheel cylinders or calipers for related wear. This part does not include a brake booster, push rod, mounting hardware, or mounting bracket.

Quality Assurance

MPA Electrical tests each unit against OE specifications using controlled processes and reference samples from its OE library to support consistent braking performance out of the box. NM55405 is a new replacement brake master cylinder built for dependable hydraulic restoration in Toyota brake service applications.