Wilwood HM5 Left Rear Hydra-Mechanical Caliper, Clear Anodize / 1.19-Inch Piston

This left-hand HM5 rear caliper pairs a 1.19-inch hydraulic piston with a mechanical actuator. Its cast aluminum floating body is clear anodized, with a nominal 0.19-inch rotor-width channel for an appropriately specified utility brake system. Wilwood Engineering, founded by Bill Wood in 1977, is based in Camarillo, California. The company makes and designs disc brake components and systems for motorsport, street-performance and specialized applications, including calipers, brake rotors, master cylinders, valves, fittings and brake lines.

Technical Details

• Manufacturer part number: 120-11028. Component: HM5 Hydra-Mechanical caliper.
• Supply: one brake caliper, not a complete axle brake kit. Match the mating rotor, pads, bracket and connection hardware to the installation.
• Hydraulic inlet thread: M10 x 1.00. Use a fitting with the correct thread and sealing seat.
• 1 stainless steel piston with 1.19-inch bore diameter. The specified effective area is 1.06 sq in.
• Caliper weight: approximately 2.4 lb.
• clear anodize finish on a cast aluminum caliper body.
• Brake pad profile 6407; select friction material for the actual operating conditions.
• 3.00-inch floating mounting pattern, left hand; hole size 0.67 inch.
• The rotor channel is specified for 0.19-inch nominal width. Rotor outside diameter: 6.00 to 11.20 inches. Specified rotor-width limits: 0.15–0.19 inch.
• Piston dust boots: included.

Fitment & Compatibility

Check the installed linkage direction and ensure the mechanical mechanism releases fully. Bracket spacing, rotor diameter and the M10 x 1.00 line connection all need to match this left-side assembly.

Ask PMB Performance to check the complete brake arrangement before ordering. Our team brings over 20 years of experience; photographs and measured bracket and rotor dimensions make that check more useful.