Discussion Starter · #1 ·
Got a problem with my brakes - hopefully you guys can help. First off, it's the truck in my sig. Within the past year I have changed the following in my brake system: Vacuum pump, front calipers, brake lines, slotted rotors, hawk pads, and brake booster about 4 or 5 months ago. Just recently (about 3 weeks ago) I began to have issues with my brake pedal being sucked to the floor when I barely touched the brakes. This would automatically lock up the brakes. It was so forceful that I would have to take my truck out of gear and hold the back of the brake pedal with my clutch foot and apply the brake with my brake foot to keep the truck from coming to a screeching hault - not safe. I drive a big rig for a living, so I left the truck with a garage I used to work at for them to diagnose and fix the problem while I was away these past two weeks. They have replaced everything again, including a new master cylinder with no fix at all. The whole system bleeds out just fine, so I would think the proportioning valve is OK as well. Any suggestions as to what to check next? Thanks for any and all input. I've got to get this truck back on the road so I can go pick up an IH travelette for a buddy this weekend. Anybody have issues like this before?