Wilwood Left Anodized MC4 Mechanical Caliper for 0.39-Inch-Wide Parking-Brake Rotors

Wilwood's left-hand MC4 separates cable-operated parking from the hydraulic service brakes. In this anodized 0.39-inch nominal rotor-width form, a floating caliper and manually adjustable piston work against pads supplied with noise-control shields. Wilwood Engineering was founded by Bill Wood in 1977 and is based in Camarillo, California. The company designs and manufactures disc brake systems and components, including calipers, brake rotors, master cylinders, valves, fittings and brake lines for motorsport, street-performance and specialized applications.

Technical Details

• Manufacturer part number: 120-17272. Type: MC4 Mechanical caliper.
• Mechanical piston count: 1. Bore: 1.19 inch; piston material: aluminum. Cable applied, with dust boot: yes.
• Rotor channel: 0.39-inch nominal width. Specified width limits: 0.31–0.39 inch; rotor outside diameter: 11.00–14.00 inches.
• Mounting: floating, 4.75-inch centers; orientation: left hand. 0.67-inch holes.
• Actuation: parking-brake cable with a 0.310-inch barrel end. Manual wear adjustment and a cable return spring are provided.
• Caliper body: die-cast aluminum body with a forged aluminum anvil; finish: Type III Anodize.
• Brake pad shape: 6407. Choose pad dimensions and friction material for the brake system.
• Assembly: one mechanical parking caliper, supplied with pads, noise-control shields and a steel mounting bracket. The service-brake system is separate.
• Caliper component weight: approximately 3.8 lb.

Fitment & Compatibility

Measure rotor thickness and compare the bracket's 4.75-inch centers with the planned mounting points. Confirm the lever can move through its required stroke without contacting the wheel, suspension or cable housing.

Manufacturer warning, brake pads only: Cancer and Reproductive Harm. P65Warnings.ca.gov.

PMB Performance has over 20 years of brake-component experience. Send the existing caliper identification, rotor measurements and mounting details for help comparing this configuration.