Hey guys my buddy just bought a 1992 Chevy Silverado, it's his first truck, it has a new engine in it with 21,000 miles on it. He got it for 1900 pretty damn good and nice truck!
When he presses on the break you hear the engine rev, and whenever the truck is on the Parking Brake light is illuminated. What is the cause? He heard from a friend it could be a vacuum leak. What would you say?