Wilwood Rear Backdraft Cobra Parking Hat with 6.31-Inch Shoe Bore

This Wilwood Backdraft Cobra rear hat uses iron construction and 2.080-inch offset. Check the 6.31-inch shoe bore and matching parking assembly. Wilwood Engineering designs and builds disc brake systems in Camarillo, California. Bill Wood established the company in 1977; it supplies brake rotors, calipers, master cylinders, valves, fittings and lines for specialized applications, street performance and motorsport. The complete brake system determines which individual components are appropriate.

Technical Details

• Manufacturer part number: 170-10961
• Rotor mounting hole/thread designation: 1/4-28
• Parking-shoe bore: 6.31 inches
• Internal clearance diameter: 5.87 inches
• Mounting-face thickness: 0.25 inches
• Hub-side hole clearance diameter(s): 0.550 inches; these are clearance dimensions, not wheel-stud thread sizes
• Manufacturer-listed attachment hardware reference: 230-7011; verify the specific rotor and attachment arrangement before ordering hardware
• Component: Parking-Brake Rotor Hat
• Material: Iron
• Surface finish: Black E-Coat
• Rotor mounting method: Fixed Mount
• Position in the specified brake assembly: Rear
• Hat offset: 2.080 inch
• Rotor attachment interface: 8 x 7.78 inches; rotor attachment, separate from the hub flange
• Hub-flange mounting/clearance pattern(s): 5 X 4.72 inches; verify the actual hub and wheel-stud clearance
• Center register diameter: 3.42 inches

Fitment & Compatibility

Use this replacement only within the specified Backdraft Cobra brake conversions. Compare the hub, caliper position and rotor attachment to the complete assembly drawing. The parking-shoe diameter, anchor arrangement and complete drum-in-hat mechanism must match. A bare hat is not a complete parking-brake assembly.

Manufacturer Reference

Wilwood component specifications and dimensions

With more than 20 years of parts and fitment experience, PMB Performance can help compare the existing brake assembly with the required component.