brake bleeding hell!
Thread Starter
Racer
Joined: Nov 2009
Posts: 486
Likes: 1
brake bleeding hell!
I have never had good brake since I replaced my brake system 2 years ago. The vette been worked on for the past 2 years as well but I am starting to street it a little more.
Installed are stainless steel lines, braided lines, wilwood mc (bench bled) and calipers. I am using a vacuum bleeding kit and been through 2 big bottles of dot 3 trying to bleed the calipers but still pull air. I keep pulling air no matter what I try. I just don't get it. I did find out that the shop installed two different calipers on the front.... which ticks me off. I am not sure if that would be the cause of the vette pulling to one side under hard braking or not..... but if the sizing is a little different between the brakes I think one would apply more pressure than the other
Anyways,
If air is getting into the system I should see a leak somewhere and the mc would get lower?
I don't know what to do anymore. I have had people pump the pedals for me, vacuum bleed brakes... even on the old mc I had the same problem. I hate this...... grrrrrr
Installed are stainless steel lines, braided lines, wilwood mc (bench bled) and calipers. I am using a vacuum bleeding kit and been through 2 big bottles of dot 3 trying to bleed the calipers but still pull air. I keep pulling air no matter what I try. I just don't get it. I did find out that the shop installed two different calipers on the front.... which ticks me off. I am not sure if that would be the cause of the vette pulling to one side under hard braking or not..... but if the sizing is a little different between the brakes I think one would apply more pressure than the other
Anyways,
If air is getting into the system I should see a leak somewhere and the mc would get lower?
I don't know what to do anymore. I have had people pump the pedals for me, vacuum bleed brakes... even on the old mc I had the same problem. I hate this...... grrrrrr
Drifting
Joined: Aug 2005
Posts: 1,372
Likes: 4
From: Springfield VA
Do you still have the lip seals? If so check all the calipers.
I use reg metal brake lines, but many here say the stainless are harder to seal, another area to check.
And one I have seen is the MC will leak into the booster but you will not see the leak. More rare compared to the other issues above but once you rull out everything else...
I use reg metal brake lines, but many here say the stainless are harder to seal, another area to check.
And one I have seen is the MC will leak into the booster but you will not see the leak. More rare compared to the other issues above but once you rull out everything else...
Thread Starter
Racer
Joined: Nov 2009
Posts: 486
Likes: 1
Do you still have the lip seals? If so check all the calipers.
I use reg metal brake lines, but many here say the stainless are harder to seal, another area to check.
And one I have seen is the MC will leak into the booster but you will not see the leak. More rare compared to the other issues above but once you rull out everything else...
I use reg metal brake lines, but many here say the stainless are harder to seal, another area to check.
And one I have seen is the MC will leak into the booster but you will not see the leak. More rare compared to the other issues above but once you rull out everything else...
I honestly could not tell you on the lips seals. I don't see any fluid from the seals on the calipers when I checked the two fronts. I think the calipers were bought from advance auto parts by the shop. I am sure they are the cheap of the cheap. I want to buy the re-done set from Vette brake products but don't have the cash right now.
Drifting
Joined: Aug 2005
Posts: 1,372
Likes: 4
From: Springfield VA
Yea the ones from advance are lip seal. They are stainless steel sleaved but lip seal.
So pretty good rebuild btu i am nto a lip seal fan.
Also what you see if not the fluid seal on the caliper but a dust seal. Pop that off and there could be fluid behind it.
Mine were leaking a little at one but when i removed the outer seal 2 other lip seals were also leaking.
Got a O-ring rebuild kit for mine to fix that problem.
So pretty good rebuild btu i am nto a lip seal fan.
Also what you see if not the fluid seal on the caliper but a dust seal. Pop that off and there could be fluid behind it.
Mine were leaking a little at one but when i removed the outer seal 2 other lip seals were also leaking.
Got a O-ring rebuild kit for mine to fix that problem.
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,112
From: Crossville TN
You really shouldn't use different calipers with any "set" of wheels (front or back sets). If the piston area is different at all, the clamping load of the pads will be different and cause what you are describing. There are other reasons for 'pulling in one direction', of course, but they shouldn't have given you two different calipers for your front wheels.
Thread Starter
Racer
Joined: Nov 2009
Posts: 486
Likes: 1
You really shouldn't use different calipers with any "set" of wheels (front or back sets). If the piston area is different at all, the clamping load of the pads will be different and cause what you are describing. There are other reasons for 'pulling in one direction', of course, but they shouldn't have given you two different calipers for your front wheels.
Does anyone think a leak can occur at a connection point in the brake lines but not seep fluid? nothing was tefloned taped.
Race Director
Joined: Apr 2011
Posts: 11,183
Likes: 3,333
From: North of Toronto - Ontario
One thing to be careful about is vacuum bleeding lip seals, it can suck air in past the seals (they are designed to stop stuff going out, not in)
I've done regular old pump and hold bleeding, gravity bleeding and now use the Motive power unit (which I really like) but certainly not a fan of vacuum bleeding vette brakes
Let the arguments begin
Mooser
I've done regular old pump and hold bleeding, gravity bleeding and now use the Motive power unit (which I really like) but certainly not a fan of vacuum bleeding vette brakes
Let the arguments begin
Mooser
Thread Starter
Racer
Joined: Nov 2009
Posts: 486
Likes: 1
One thing to be careful about is vacuum bleeding lip seals, it can suck air in past the seals (they are designed to stop stuff going out, not in)
I've done regular old pump and hold bleeding, gravity bleeding and now use the Motive power unit (which I really like) but certainly not a fan of vacuum bleeding vette brakes
Let the arguments begin
Mooser
I've done regular old pump and hold bleeding, gravity bleeding and now use the Motive power unit (which I really like) but certainly not a fan of vacuum bleeding vette brakes
Let the arguments begin
Mooser
Have a link of the motive power unit?
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Melting Slicks
Joined: Nov 2001
Posts: 2,668
Likes: 43
From: Eastern US XX
One thing to be careful about is vacuum bleeding lip seals, it can suck air in past the seals (they are designed to stop stuff going out, not in)
I've done regular old pump and hold bleeding, gravity bleeding and now use the Motive power unit (which I really like) but certainly not a fan of vacuum bleeding vette brakes
Let the arguments begin
Mooser
I've done regular old pump and hold bleeding, gravity bleeding and now use the Motive power unit (which I really like) but certainly not a fan of vacuum bleeding vette brakes
Let the arguments begin
Mooser
Buy a Motive and be done with it!
Race Director
Joined: Apr 2011
Posts: 11,183
Likes: 3,333
From: North of Toronto - Ontario
They are sold all over the place, I think motive products is the company. Do a search here in the forums on motive power bleeder (or google it)
It's kind of a glorified bug sprayer and has some drawbacks, I like it because I work by myself mostly and don't seem to ever have the time for gravity bleeding.
I bought mine from one of the distributors here in Ontario. Don't know where you are located but corvette central sells them, probable lots of places around you somewhere.
I'd lend you mine if your close
Mooser
It's kind of a glorified bug sprayer and has some drawbacks, I like it because I work by myself mostly and don't seem to ever have the time for gravity bleeding.
I bought mine from one of the distributors here in Ontario. Don't know where you are located but corvette central sells them, probable lots of places around you somewhere.
I'd lend you mine if your close
Mooser