Yet another brake question
Thread Starter
Le Mans Master
Joined: Jan 2003
Posts: 6,575
Likes: 1
From: Tuttle OK
Cruise-In VIII Veteran
Yet another brake question
OK, here's my dilemma. Changed all calipers. Changed front brake lines. Bled the dayum things 3 times (gettin’ a power bleeder to try the 4th). Brakes want to go to the floor. I get air out every time, they'll run 20 miles or so, and back to the floor.
I cannot find a leak and it's beyond me how I can get more air in without pushing fluid out. The air can't be coming in with more than a couple of pounds of pressure and when you push the brakes you are applying several hundred pounds. Have I not gotten all the air out or how can I have a leak (caliper, line, etc.) without seeing fluid somewhere.
:banghead: :banghead: :banghead:
I cannot find a leak and it's beyond me how I can get more air in without pushing fluid out. The air can't be coming in with more than a couple of pounds of pressure and when you push the brakes you are applying several hundred pounds. Have I not gotten all the air out or how can I have a leak (caliper, line, etc.) without seeing fluid somewhere.
:banghead: :banghead: :banghead:
Race Director
Joined: Feb 1999
Posts: 19,659
Likes: 34
From: Lenoir City Tennessee
Ci 6, 8 & 10 Veteran
St. Jude Donor '05-'06-'07-'08-'09-'10-'11-'12-'13-'14-'15
Re: Yet another brake question (Avette4me)
Did you have your rotors trued when you put the new calipers on? They may be pumping air in while you are driving.
Burning Brakes
Joined: Nov 2001
Posts: 1,191
Likes: 1
Re: Yet another brake question (Avette4me)
I had them turned. Can they suck air without pumping fluid out?
Your rotors may be true to themselves and still wobble installed on the car. That would get air into the system.
Melting Slicks
Joined: Feb 2001
Posts: 3,330
Likes: 13
From: Europe , Luxembourg
Re: Yet another brake question (Avette4me)
Hi
The brake caliper O-ring kit ( from VBP ) for about 120 $ will eliminate the air pumping problem.
Check out previous posts on this.
Best safety conversion I did so far on my 68 big block.
I also had the aft discs turned and they where OK, but when installed , the drivers aft disc had runout, obviously coming from the spindle ?
I underlayed it with high speed alu tape until runout was minor.
The car brakes like never B4 and no more air sucking at all.
Good luck Gunther :seeya
The brake caliper O-ring kit ( from VBP ) for about 120 $ will eliminate the air pumping problem.
Check out previous posts on this.
Best safety conversion I did so far on my 68 big block.
I also had the aft discs turned and they where OK, but when installed , the drivers aft disc had runout, obviously coming from the spindle ?
I underlayed it with high speed alu tape until runout was minor.
The car brakes like never B4 and no more air sucking at all.
Good luck Gunther :seeya
Thread Starter
Le Mans Master
Joined: Jan 2003
Posts: 6,575
Likes: 1
From: Tuttle OK
Cruise-In VIII Veteran
Re: Yet another brake question (WESCH)
Thanks to all - I'll be working on her this weekend.
While I agree with ou, it is still beyond me how I can suck air without leaking fluid. Perhaps some things are not meant for me to understand, just fix!
Thanks again. :cheers:
While I agree with ou, it is still beyond me how I can suck air without leaking fluid. Perhaps some things are not meant for me to understand, just fix!
Thanks again. :cheers:
Burning Brakes
Joined: May 2002
Posts: 998
Likes: 1
From: Frisco TX
Re: Yet another brake question (Avette4me)
Its not a sealed system... the spring pushes on the pad into the disk. As the disk turns, if the runout is out, one side of the pad will be pushed out (and this 1/2 of the pistons) and then the other side will be pushed out. This action turns the pistons/pads into an airpump, pushing air into the lines (and making the fluid level probably go up?).
That's my understanding at least.
Some people say to just get rid of the spring. Others say the oring is the solution (the oring makes the most sense to me).
That's my understanding at least.
Some people say to just get rid of the spring. Others say the oring is the solution (the oring makes the most sense to me).
Racer
Joined: Jan 2003
Posts: 397
Likes: 0
From: Morganton GA
Re: Yet another brake question (goofygrin)
What has been described as "pushing air into the system" is not really exactly that... what happens is when the rotor is not trued to the spindle, it has a wobble effect. After a few miles, it pushes the pads into the pistons similar to when you do this by hand before removing the pads. Ever notice that you have to pump the brakes a few times before they get firm again after changing pads? Same thing.
Good luck with your new ride... :cool:
Good luck with your new ride... :cool:
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Thread Starter
Le Mans Master
Joined: Jan 2003
Posts: 6,575
Likes: 1
From: Tuttle OK
Cruise-In VIII Veteran
Re: Yet another brake question (goofygrin)
Interesting. Thanks for the lesson, I'm always out to better understand. Funny, I had the entire suspension apart without much of a problem and am getting eaten alive by a simple hydraulic system.
Dayum :banghead: :D
Dayum :banghead: :D
Melting Slicks
Joined: Dec 2000
Posts: 3,407
Likes: 2
From: Carmichael CA
Re: Yet another brake question (Avette4me)
I had them turned. Can they suck air without pumping fluid out?
Here's my help URL:
http://67.116.80.82/Vette/BrakeHelp/BrakeHelp.html
Instructor
Joined: May 2003
Posts: 125
Likes: 0
From: Lexington KY
Re: Yet another brake question (Avette4me)
I have just been through one hell of a fire drill with C-3 brakes. At this point I consider myself an expert. If you have no luck this weekend feel free to e-mail me and I will try to help you out. iniguy@direcway.com
Melting Slicks
Joined: Feb 2001
Posts: 3,330
Likes: 13
From: Europe , Luxembourg
Re: Yet another brake question (Avette4me)
While I agree with ou, it is still beyond me how I can suck air without leaking fluid.
The O-ring convesrion fixed it.
I think it's just the setup of the lip seals that make it so easy to get air into the caliper, but no fluid out as the seal lips seal on pressure builup.
The O-rings do a positive sealing both ways.
Gunther