The Wilwood 150-40-7420K is a BP-40 compound pad in the 7420 bridge-bolt pattern, which Wilwood lists for Superlite w/Bridgebolt, FSL, SL4 and SL6 calipers. The BP-40 compound is a high-friction race formula with a high friction pad with aggressive initial response and low wear rate during sustained high heat braking. Against stock or street-oriented pads, the case for this set is heat fade resistance on a dedicated track car. Wilwood places road course and oval work usually in the over-1000°F range, so match the compound to your actual pad temperatures before buying. Search terms this pad answers include Wilwood 7420 FSL pads, BP-40 track pads, and Superlite 6 bridge-bolt race pads.
Fitment is straightforward when your calipers are in the supported list: FSL calipers use the same 7420 type bridge bolt brake pad used in all Superlite 6 piston calipers. For installation, the manufacturer's process starts by removing the caliper center bridge retainer bolt, nut and tube, then seating the pads with the friction material facing the rotor. Check that the top of the pad is flush with the outside diameter of the rotor, and adjust with shims if it is not. If you bleed the system afterward, Wilwood recommends Hi-Temp 570 grade fluid or higher, and the pad and rotor contact surfaces must never be contaminated with brake fluid.
The manufacturer rates the BP-40 compound for racing only and not for street use. Its guidance warns against using high-temperature race pads for low to medium temperature driving on the street.
Yes. The manufacturer's bedding steps call for a series of hard decelerations from roughly 55-65 MPH down to 25 MPH, performed only at a race track or other safe location. Wilwood also offers factory dyno-bedded pads as an alternative when track time is limited.
The manufacturer's pad documentation for the 7420 pad lists Superlite w/Bridgebolt, FSL, SL4 and SL6 calipers. Radial-mount variants are not confirmed in that documentation, so confirm fitment with the manufacturer before ordering for those calipers.
Pad installation is a moderate DIY job that involves removing the caliper and the center bridge retainer hardware, so plan on the full brake service workflow. Per the manufacturer's steps, seat the pads with the friction side facing the rotor and confirm the pad tops sit flush with the rotor's outside diameter. Keep brake fluid away from the pad and rotor faces and use a catch bottle with a hose when bleeding. After installation, complete the manufacturer's bedding cycle on a track before running hard laps, since putting new pads into hard service right away can cause fractures or accelerated deterioration from extreme temperature variations.
