Wilwood Rear FNSL4R Parking Brake Kit, Black Calipers and 14-Inch GT Rotors, GM G-Body 2.62-Inch Offset

Convert a measured GM G-Body rear axle with black four-piston calipers and 14-inch slotted rotors. Confirm the 2.62-inch offset and cable fit. The conversion combines the caliper, pad and rotor configuration specified for this axle and mounting arrangement. Founded by Bill Wood in 1977, Wilwood Engineering 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. Its motorsport, street-performance and specialized applications require individual components matched to the complete brake system.

Technical Details

• Manufacturer part number: 140-17659
• Brake assembly: rear conversion kit; Sold as a kit.
• Calipers: Forged Narrow Superlite 4R; 4 pistons per caliper; Black Powder Coat
• Caliper mounting: Radial
• Included pad compound: BP-10
• Piston material: Stainless
• Hydraulic caliper inlet: 1/8-27 NPT
• Rotor dimensions and construction: 14.00 × 1.10 inches; Spec-37 Iron; GT Slotted
• Wheel-size reference: 18 in; the complete wheel-clearance drawing determines fit
• Axle mounting interface: G-Body; measured axle offset 2.62 in
• Rotor / hat axle-flange drilling: 5 x 4.50; 5 x 4.75; 5 x 5.00 inches; this does not change the retained hub or axle wheel pattern
• Hydraulic flexlines: Not included; supply suitable hoses and fittings separately
• Mounting hardware: Included; verify the installed fastener engagement
• Not included: spindles, wheel hubs, master cylinder or brake booster
• Parking system: Internal shoe parking brake; cable connection must be configured for the vehicle

Fitment & Compatibility

Select this rear conversion by the GM G-Body housing flange and measured 2.62-inch axle offset. Installation requires substantial housing-flange material removal and drilling two holes as shown in DS-1571; a qualified machine shop is recommended. Parking-brake cables and their connection hardware are separate. Check shock-mount interference, axle registration and clearance around the 14-inch rotors and calipers.

Wilwood product specifications · Wilwood installation and compatibility information · Axle measurement worksheet · Wilwood installation and compatibility information

PMB Performance brings over 20 years of parts and fitment experience to component selection. Share the actual housing flange, axle offset, rotor registration and parking or hydraulic arrangement so we can help check the configuration before ordering.

Manufacturer warning — brake pads only: WARNING: Cancer and Reproductive Harm. www.P65Warnings.ca.gov.