MPA Electrical NM55689 Brake Master Cylinder

Brake Master Cylinder for Volvo Front Disc Brake Applications

Restore consistent brake pedal response with this MPA Electrical brake master cylinder, part number NM55689. It is a standard replacement for Volvo vehicles with front disc brakes and is built with an aluminum body, a 1.002-inch bore, and a new seal for dependable hydraulic performance.

Compatible with Volvo XC60, XC70, S80, V70, V60 Cross Country, and S60 Cross Country applications listed below, NM55689 is engineered to match OE specifications using tested manufacturing processes for consistent braking performance right out of the box.

Key Features

• Brand: MPA Electrical
• Part number: NM55689
• Brake master cylinder for hydraulic brake systems
• Standard replacement grade
• Aluminum master cylinder construction
• 1.002-inch master cylinder bore diameter
• Gasket or seal included
• Two mounting holes
• New product condition
• Fits vehicles with front disc brakes

Detailed Description

MPA Electrical NM55689 is a brake master cylinder designed to restore hydraulic braking performance on Volvo platforms with front disc brakes. The aluminum housing helps keep weight down while maintaining the strength needed for everyday braking demands. With a 1.002-inch bore diameter and OE-based testing, this master cylinder is built to deliver consistent pedal feel and fluid pressure transfer for the listed applications.

This part cross-references Volvo OE numbers 8603741 and 36002450 for the same application. It is a direct-fit style replacement for Volvo XC60, XC70, S80, V70, V60 Cross Country, and S60 Cross Country models shown in the fitment data, and the NM55689 part number should be verified against the vehicle’s brake configuration before installation.

What It Helps Fix

• Low or inconsistent brake pedal feel
• Internal hydraulic leakage in the master cylinder
• Loss of braking pressure at the pedal
• Brake fluid bypass affecting stopping response
• Wear-related master cylinder performance decline

Installation Notes and Tips

• Confirm the vehicle has front disc brakes before installation.
• Verify mounting hole count and bore size against the original unit.
• Reservoir, cap, push rod, brake booster, sensor, and mounting hardware are not included.
• Inspect the brake system for contamination or leaks before bleeding the system.
• Bleed the hydraulic system thoroughly after installation to remove air.

Quality Assurance

MPA Electrical uses OE sample data and controlled testing protocols to check each master cylinder against OE specifications. That process supports consistent fit and braking performance for Volvo brake master cylinder replacement applications.