Brake Bleeding Question (HELP PLEASE)
Thread Starter
Staging Lane
Joined: Jan 2004
Posts: 82
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Brake Bleeding Question (HELP PLEASE) I have a 69 Camaro with late model LS1 calipers, new lines, SS brake hoses, new master cylinder , new proportioning valve and new SS power brake booster. I bench bleeded the master cylinder and started the process of bleeding the individual calipers starting with the rear passenger side first. I just finished assembling everything and did have a couple of leaks that I fixed in the front part of the brake system.
Problem...when the brakes are pumped and held down (wife helping me out), there is no air or brake fluid escaping through the bleeder valve when I open it. I've tried both sides with the same results. I then used a vacuum pump and I was able to get some fluid out but minimal. it seem as if there is no pressure at the calipers.
Question....I have the proportioning valve adjusted all the way to towards the "increase" direction on the rear brakes...I went the other direction all the way to "decrease".... there no change. Logic tells me it should be adjusted all the way to the "increase" seeting to allow more pressure. It seems as if the sytem is blocked but I can still remove fluid with the vaccum pump. Also, the pedal has no resistance at this point after pumping several times.
The front brakes have the same symptoms. No pressure of fluid and air escaping when the bleed valve is released after pumping and holding the brake pedal in the down position. I checked the brake rod and everything seems to be in order in terms of linkage and the booster rod seems to be located in the right position to move the master cylinder piston......anyone got any suggestions for trouble shooting? I'm stumped!
PS..all bleeders are located on top of calipers!
Anyone got any suggestions.
Problem...when the brakes are pumped and held down (wife helping me out), there is no air or brake fluid escaping through the bleeder valve when I open it. I've tried both sides with the same results. I then used a vacuum pump and I was able to get some fluid out but minimal. it seem as if there is no pressure at the calipers.
Question....I have the proportioning valve adjusted all the way to towards the "increase" direction on the rear brakes...I went the other direction all the way to "decrease".... there no change. Logic tells me it should be adjusted all the way to the "increase" seeting to allow more pressure. It seems as if the sytem is blocked but I can still remove fluid with the vaccum pump. Also, the pedal has no resistance at this point after pumping several times.
The front brakes have the same symptoms. No pressure of fluid and air escaping when the bleed valve is released after pumping and holding the brake pedal in the down position. I checked the brake rod and everything seems to be in order in terms of linkage and the booster rod seems to be located in the right position to move the master cylinder piston......anyone got any suggestions for trouble shooting? I'm stumped!
PS..all bleeders are located on top of calipers!
Anyone got any suggestions.
TECH Resident
Joined: Oct 2004
Posts: 807
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From: TAMPA by way of MIAMI!!!
Did you get any of this from Stainless Steel Brakes or have it shipped in by UPS/FedEx? If so I had the same problem when I did the conversion on my dads '65 C-10 what had ended up happening was the master cylinder had gotten beat up in shipping and the seals were fugged and it acted the exact same way we got a new Master and it works great. Also it bench bled fine so I thought it was good it just couldn't get all the way to the calipers, and you might want to gravity bleed them a little bit to keep from having to do a quad work out to bleed the damn things.
Teching In
Joined: Dec 2005
Posts: 15
Likes: 0
try opening the bleeder screw then have sombody lightly press the brake pedal down slowly to force fluid out. SLOWLY AND LIGHTLY PRESSING PEDAL DOWN. then close bleeder before pedal reaches full depressed position. i work on brakes all day everyday and somtimes this works if there is an air lock in the system by some chance. just another option for you.
