Every SL4 caliper incorporates new and adapted performance features from other Wilwood designs. Each caliper is equipped with replaceable SRS stainless steel bridge wear plates. SRS plates eliminate the bridge wear caused by pad gouging to extend the service life of the caliper. The spring-loaded action of the SRS plates eliminates pad rattle and dampens the vibration harmonics that contribute to pad squeal. The bodies are machined with recesses to protect the fluid crossover tubes and bleed screws. The fluid tubes are dampen mounted and two piece bleed screw assemblies assure reliability in harsh conditions and round out the total performance package. The full range of Wilwood brake pad compounds is available in the 7420 type pads to match the brake response and heat range of any competition application.