power master trouble

[dwmoore]

2 month old P/M , brakes been great untill yesterday light came on hard pedalpump not running unpluged pump then pluged back in pump runs and light goes out but pump wont stop running good pedal good brakes no light but pump wont stop unless unplug it or un plug the pressure switch or turn off the key. HELP

 

[Turbo1dr]

Probably switch.

Or you can get a Hydraboost set-up OR a vacuum set-up to replace that pesky old Power Master.