Smokey73
Full Access Member
I just added another truck to the fleet 
. A '92 3/4ton 4x4. The po told me about all the problems before I bought it ($1500). One of the problems was the brake pedal was real hard and didn't stop well at all. After I got it, I noticed that you could hear the vacum pump hissing as it ran. I pulled the line off of the brake booster and plugged the line with my thumb and the hissing stopped. I put a new booster on it and the brakes worked good, not great, for a day or two. Now they work good, sometimes, but only if the RPM's are up, like going down the road but the pedal gets hard after you pump it more than once or twice or if you're at a stop sign. I'm thinking that it's the vacum pump but what are the symptoms of a master cylinder going out?
. A '92 3/4ton 4x4. The po told me about all the problems before I bought it ($1500). One of the problems was the brake pedal was real hard and didn't stop well at all. After I got it, I noticed that you could hear the vacum pump hissing as it ran. I pulled the line off of the brake booster and plugged the line with my thumb and the hissing stopped. I put a new booster on it and the brakes worked good, not great, for a day or two. Now they work good, sometimes, but only if the RPM's are up, like going down the road but the pedal gets hard after you pump it more than once or twice or if you're at a stop sign. I'm thinking that it's the vacum pump but what are the symptoms of a master cylinder going out?
