All Cobalt Friction XR-Series Racing Brake Pads feature true 100% "no-bedding required" to achieve full frictional performance, unlike most traditional race pads which require very specific bedding instructions for proper function. Unmatched friction vs. temperature stability and consistency. Additionally, Cobalt Friction materials exhibit unmatched disc finish and life as compared to any competing racing friction.
Cobalt XR4 is a medium torque compound sharing a similar application basis as our popular XR3 material, but at lower overall friction levels. With a slightly rising torque curve at low to moderate line pressures, transitioning to a virtually flat profile at higher line pressures and temperatures, the XR4 is primarily a rear-axle compound for vehicles under 2800lbs. However, the excellent cold performance, friction stability and consistency of the XR4 also make it a class-leading autocross compound on vehicles up to 3200lbs.
Note: Lotus Cup AP 4-Pot refers to the 4 piston AP calipers found on Cup 255-260 Exiges, Exige S240, etc... Applicable to front OEM Lotus 4 pot calipers in those applications
Please see our brake pad tech article here for further information about which compound to select.