Classic Performance combination brake proportioning valve tools save you the headache of resetting your valve. Designed for use with CPP proportioning valves, these tools lock the valve in place and keep it from tripping when bleeding your brakes. You simply remove the warning light switch (white plug) on the valve and screw in the tool while bleeding your brakes. After the process is finished replace the warning light switch. Thanks to Classic Performance proportioning valve tools bleeding your brakes is now easier.