MPA Electrical NM55091 Brake Master Cylinder

Brake Master Cylinder for Toyota 4Runner

Restore consistent brake pedal response with this MPA Electrical brake master cylinder for the 1996-2000 Toyota 4Runner with front disc brakes. Part number NM55091 is a standard replacement unit built with an aluminum body, integrated reservoir, and a 1-inch bore for direct hydraulic performance.

MPA Electrical’s New with front disc brakes product line focuses on replacement brake hydraulics that are tested against OE specifications using sample-based validation and controlled inspection processes. This NM55091 master cylinder is built for drivers servicing a Toyota 4Runner brake system that needs dependable fluid pressure and predictable pedal feel.

• Fits 1996-2000 Toyota 4Runner, N/A, New with front disc brakes
• Part number NM55091
• Standard replacement brake master cylinder
• Aluminum master cylinder construction
• 1-inch master cylinder bore diameter
• Reservoir included; master cylinder cap included
• Uses DOT 3 brake fluid
• Two mounting holes with 0.35-inch mounting hole diameter

Detailed Product Overview

This brake master cylinder is engineered for Toyota 4Runner brake hydraulics where the original unit has worn, leaked, or lost pressure. The aluminum housing helps keep weight down while the integrated reservoir and included cap support a clean replacement setup. Part number NM55091 also cross-references Toyota 472013D380 for the same application.

Because this unit is specified for 1996-2000 Toyota 4Runner models with front disc brakes, it is a direct-fit service part for common brake system repairs on this platform. The 1-inch bore size and DOT 3 fluid specification align with standard hydraulic brake service requirements.

Common Problems This Part Can Address

• Low or inconsistent brake pedal feel
• External or internal master cylinder fluid leakage
• Brake pedal sinking under steady pressure
• Reduced hydraulic pressure in the Toyota 4Runner brake system
• Brake warning symptoms related to master cylinder wear

Installation Notes and Tips

Before installation, verify the vehicle is a 1996-2000 Toyota 4Runner with front disc brakes and confirm the bore and mounting dimensions match the original unit. Transfer any required brake lines carefully, bench bleed the master cylinder before final installation, and flush the system with fresh DOT 3 brake fluid to remove air from the hydraulic circuit.

This part does not include mounting hardware, a brake booster, push rod, gasket or seal, sensor, mounting bracket, or brake pressure switch. Use clean brake fluid and inspect the rest of the braking system for contamination or wear during service.

Quality Assurance

MPA Electrical tests each brake master cylinder against OE specifications using proprietary procedures and strict inspection protocols to help ensure consistent braking performance after installation.