Brake Issue on Re-assembly
Le Mans Master
Joined: Aug 2006
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From: mount holly NC
2025 c3 ('74-'82) of the Year Finalist - Unmodified
2019 C3 of Year Finalist (appearance mods)
Safety Car
Joined: Jun 2004
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From: Lakeland Florida
It sounds as if the rear brake calipers should be inspected to see that they have the 2 bleeder screws. On my vettes I know I have them. That may be part of the problem you are having with getting all the air out.
kdf
kdf
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From: Visalia CA
To gravity bleed just take the cover off the master and open the bleeder and wait until fluid starts running out.
Did you try bleeding all 4 screws on the rear calipers yet? If you've been able to pump fluid through the master by bleeding it then I can't see you needing to bench bleed. Typically, you can't get any fluid flow when you need to bench bleed.
Did you try bleeding all 4 screws on the rear calipers yet? If you've been able to pump fluid through the master by bleeding it then I can't see you needing to bench bleed. Typically, you can't get any fluid flow when you need to bench bleed.
Le Mans Master
Joined: Aug 2006
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From: mount holly NC
2025 c3 ('74-'82) of the Year Finalist - Unmodified
2019 C3 of Year Finalist (appearance mods)
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From: Visalia CA
I'm sorry, I thought I'd mentioned that. Yes, the rears DO have both inners and outers.
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From: Visalia CA
OK, I'm back. Replaced all four hoses and one metal line, refilled master cylinder, bled it, and went thru bleeding sequence on rears (inners & outers) plus fronts. I used a buddy to help by sitting in car, pumping brake pedal and then holding down while I popped open bleeders and closed them. Did this many, many times. Went thru darn near 2 qts of new brake fluid and yet contine to see air in rears. Fronts seem to be ok with no visible air seen. But with rears, I see 1-2 cycles with no air, but then the next cycle produces air. I detect no fluid leaks anywhere in the system. I think I need to keep trying, but do so with no better results. Am thinking bad master cylinder???
All of the bleeding is done with engine off. During the process, we do start to get a hard pedal (approx 50% travel but when we start the engine (power brakes), the pedal goes almost to floor. Whassup w/that?
Any thoughts/ideas?
thanks in advance!
Wayne
All of the bleeding is done with engine off. During the process, we do start to get a hard pedal (approx 50% travel but when we start the engine (power brakes), the pedal goes almost to floor. Whassup w/that?
Any thoughts/ideas?
thanks in advance!
Wayne
Le Mans Master
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From: melbourne florida
2023 C3 of the Year Finalist - Modified
well, this should have been said before. it helps to tap on the calipers to break up the air bubbles and move them through. some may try to take exception to that but the guy who taught brakes at the G.M training centers told me that years ago.
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From: Visalia CA
Did that as well . . . didn't help.
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Drifting
Joined: May 2012
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From: Calgary Alberta
Lip seals are the seals that surround the pistons on the calipers. When they deteriorate they can allow air past them and into the system.
100% sure you don't have any small leaks anywhere?
100% sure you don't have any small leaks anywhere?
Drifting
Joined: May 2012
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From: Calgary Alberta