Wilwood Rear Aluminum Parking Hat with 1.540-Inch Offset

This aluminum Wilwood rear hat uses a 7.23-inch parking-shoe bore and 1.540-inch offset. Match the hub flange and complete parking mechanism. Wilwood Engineering’s work covers the design and manufacture of disc brake systems for motorsport, street-performance and specialized applications. Bill Wood founded the company in 1977 in a business now based in Camarillo, California. Its calipers, master cylinders, brake rotors, brake lines, valves and fittings must be selected around the complete system.

Technical Details

• Manufacturer part number: 170-13539
• Hub-flange mounting/clearance pattern(s): 5 x 4.50, 5 x 4.75, 5 x 5.00 inches; verify the actual hub and wheel-stud clearance
• Center register diameter: 3.06 inches
• Rotor mounting hole/thread designation: 1/4-20
• Parking-shoe bore: 7.23 inches
• Internal clearance diameter: 6.85 inches
• Mounting-face thickness: 0.18 inches
• Hub-side hole clearance diameter(s): 0.520 inches; these are clearance dimensions, not wheel-stud thread sizes
• Manufacturer-listed attachment hardware reference: 230-8008; verify the specific rotor and attachment arrangement before ordering hardware
• Manufacturer installation note: 3.06 " diameter register with counterbore for register ring.
• Component: Parking-Brake Rotor Hat
• Material: Aluminum
• Surface finish: Black E-Coat
• Rotor mounting method: Fixed Mount
• Position in the specified brake assembly: Rear
• Hat offset: 1.540 inch
• Rotor attachment interface: 12 x 8.75 inches; rotor attachment, separate from the hub flange

Fitment & Compatibility

Select this hat for the exact Matched big-brake parking systems and installed hub arrangement. Compare the original part, rotor mounting circle and required hardware before replacing any component. 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

PMB Performance brings over 20 years of experience to brake-component selection. Provide the actual hardware specification when the brake system has been modified.