Hey i just bought my first vehicle yesterday and its a 1993 Ford F250. The truck has a 7.3L Diesel and 5 Speed. The only problem with the truck is the brakes. When im driving and i come up to a red light the first time i apply the brakes they work very well and grab really good. But if i take my foot off the brakes and put them on again...i get nothing...the brakes dont want to grab no matter how hard i push the pedal. Say im driving down the road and somebody pulls out infront of me and i slam the brakes they grab well and work...but again if i take my foot of the pedal and apply the brakes i get nothing. The guy i bought the truck off of says he was told that it could be a problem with the pump on the front of the motor that produces the vacuum. That pump connects to the brake booster. I was wondering if anybody knows whats wrong with my brakes or what i can do to fix it. Thanks.

 

Yeah I dont know a whole lot about diesels but I can tell you its definitely a vacuum issue. May either be a bad vacuum pump or a vacuum leak.