I changed my rear shoes/wheel cylinders and they were fine, two months later, I changed the front pads/rotors. Got in the car and the brake didn't activate until the pedal hit the floor, I bled the **** out of those brakes trying to get pedal pressure, nothing happened. Found out there was a leak in the diaphragm of my booster, so I upgraded to the GSR brake booster/master cylinder. I bench bled the master prior to install, then bled the system all around after install. Nothing helped my brakes, it still engages when the pedal is almost to the floor. Today, I opened the front right and left rear bleeder valves and let it gravity bleed for a while, then I did the same with the front left and the right rear, added new fluid, still the same. Next, I moved on to using a pressure bleeder to try to bleed the system and it's still the same. I reverse bled the master cylinder by opening the fittings that go to the master while someone pumped and held the brake, still nothing. I just pulled the calipers and inspected them for leaks as well as the rear wheel cylinders, nothing wrong. Next, I moved on to the brake lines, visually inspecting the ones I could see, no leaks.

I am confident that there is absolutely NO air in my brake system, all components of the system are new except for the lines and the front calipers which are just fine. Any ideas on what could be wrong?

 

How about the adjustment of the pushrod length??

 

hey this thing kind of happend to a friend of mine. bleed the brakes once around once done start all over again and bleed the brakes again you should get air to come out each time you bleed them. see when the whole system is drained and you try and fill it again you cant just bleed it like you would if you changed the caliper on one side. you have to start to bleed the system doing one wheel at a time once you get all the way around start over again. you should keep gettin bubbles everytime till all the air is out. this took my friend about 9 passed to get all the air out it has something to do with the valve that sends fliud to all four corners once you get ari out of one and do another it kind of send air to the side you were right one so you have to keep going around till its all out.

wear a back brace doing this by the 5 pass your back is going to be killin you

 

Yeah I agree with Jim, even if you R&R original Master you normally should adjust the pushrod. If you tried it already, did it work?


[Modified by fmaxturbochic, 10:24 PM 3/19/2003]

 

Been away for a while, adjusted the pedal freeplay and bled the brakes for about an hour. Three bottles of DOT3 later, they were workin fine, thanks guys.