Ask a Classic Car Question, Get an Answer ASAP!
We have tryed the vacuum pump, we down to by passing the equalizeler vaule from front to back to see if is working the way it should.
we have tryed all of your anwsers so far. the equalizeler vaule is between front and back so we though it could make trouble????
We had three people working on the brake at same time. one master, tokeep full, one pumping brakes, one bleeding at the bleeder. we still get air.
Hi, I can help you with this. The very first thing is to bench bleed the master cylinder before installing on vehicle. If you continue to get air while bench bleeding, the master is defective. Fill master in vise and push rear of piston all the way in, put finger over ports to prevent air being sucked in before releasing or you can use a bleeding tool that screws into the ports with a hose attached going into master reservoir below fluid level. Keep pushing piston in & out until there is a steady stream of fluid with no air comming out both outlet ports and inside reservoir. If you continue to get air, the master is defective. Once master is bench bled, install on vehicle and bleed at outlet ports where lines attach, then bleed at both sides of proportioning valve starting at inlet side, then outlet side before going to wheels. Rule #1, Never release brake pedal with line or bleeder open. Always close line or bleeder before releasing brake pedal. If you do, this will suck air back into the system. Once you get to the wheels, run a hose from bleeder into a jar of brake fluid. Hose must be submerged in the fluid in jar. Continue bleeding until there are no air bubbles present before going to next wheel. Start at right rear, then left rear, then right front, then left front. If you cannot get pressure out the outlet port of proportioning valve or pressure to rear brakes, let me know.
I said that we had tryed everthing your people tolded me we have tryed. I was hoping you could come up with something to help us along. We are taking the wheel cylineder apart to see if something is wrong.
I am a different expert. First of all what I have told you in detail was not mentioned in any of the replies. It's one thing to say you've done everything, but did you do it exactly as I explained it, in the order that I explained it. Did you first bench bleed the master with no air and a steady stream of fluid appearing in reservoir and outlet ports? After installing master did you bleed first at outlet ports where the lines connect at master then, did you bleed at combination valve, inlet first, outlet last before going to wheels? Did you then connect a hose from bleeder into and submersed in a jar of brake fluid and bled brakes until there was no air bubbles in jar?
Tell me about the lines you installed. Did you replace all steel brake lines? Are they all double flared fittings connected properly. Have you checked with a soapy solution where the lines connect while pumping brake pedal to check for air bubbles at connections? I am willing to help you solve your problem. Please do not give feedback until you are satisfied.