Replacement RF27090019 Brake Master Cylinder with Reservoir 1 In. Bore 4-Wheel ABS No Traction Control

The Replacement RF27090019 is a new brake master cylinder assembly engineered as a direct OEM-quality replacement for Ford Crown Victoria, Lincoln Town Car, and Mercury Marauder applications. Designed for vehicles equipped with 4-wheel ABS without traction control, this master cylinder restores proper hydraulic brake system function and delivers confident, reliable stopping power.

The brake master cylinder is the heart of your vehicle's hydraulic braking system. When the brake pedal is pressed, the master cylinder converts that mechanical force into hydraulic pressure, sending fluid through the brake lines to actuate the calipers and wheel cylinders at each corner of the vehicle. A worn or leaking master cylinder can result in a soft, spongy, or sinking brake pedal — a serious safety concern that warrants immediate replacement.

Key Specifications:

• Bore Diameter: 1 inch
• Rearward Outlet Size: M12 x 1.0
• Secondary Outlet Thread Diameter: M12 x 1.0
• Material: Aluminum alloy construction
• Includes: Integrated fluid reservoir and cap
• ABS Compatibility: 4-Wheel ABS
• Traction Control: Without traction control

OEM & Cross-Reference Part Numbers:

• Ford OEM: 1W1Z-2140-BA, 6W1Z-2140-BA
• Also cross-references: M630054, MC390693, 130.61118, BM51262, MCA630054, 132942, BRMC62

This replacement brake master cylinder is built to original equipment specifications for a precise, trouble-free installation. The unit ships complete with the fluid reservoir, eliminating the need to transfer components from the old assembly.