Break Problem? Need Help.
Thread Starter
Melting Slicks
Joined: Mar 2002
Posts: 3,252
Likes: 6
From: The Colony Tx
Break Problem? Need Help.
I am beginning to feel like I should move over here, or at least sub-let, from the C4 area. Again my son is having problems and needs some advice.
He has replaced all 4 calipers and the master cylinder and he is still having problems. A couple of days ago he drove the car on approx. a 100 mile roundtrip and by the time he got home, the break light was on full time and he had no pedal. He says the fluid in the master was full.
I think he has air trapped somewhere in the system and have suggested he take it to someone and have it bleed again. I seem to remember from a long time ago that the calipers have a problem trapping air and when bleeding you need to tap them with a rubber hammer to get the air out.
Does this problem ring a bell with anyone. Again thanks in advance for any assistance.
He has replaced all 4 calipers and the master cylinder and he is still having problems. A couple of days ago he drove the car on approx. a 100 mile roundtrip and by the time he got home, the break light was on full time and he had no pedal. He says the fluid in the master was full.
I think he has air trapped somewhere in the system and have suggested he take it to someone and have it bleed again. I seem to remember from a long time ago that the calipers have a problem trapping air and when bleeding you need to tap them with a rubber hammer to get the air out.
Does this problem ring a bell with anyone. Again thanks in advance for any assistance.
Le Mans Master
Joined: Jan 2000
Posts: 8,918
Likes: 27
From: New Hill NC
Re: Break Problem? Need Help. (aj1988)
There should be tons in the archives on this one. It is THE most common brake problem with these cars other than leaking. You have runnout on the rear rotors. They must be trued to .005 or less to assure that air is not pumped into the calipers.
Melting Slicks
Joined: Oct 2000
Posts: 3,023
Likes: 2
From: TEXASTEXASTEXASTEXAS TEXASTEXASTEXASTEXAS
St. Jude Contributor
Re: Break Problem? Need Help. (wombvette)
:iagree: If he had a firm pedal and lost it over 100 miles, I'd say the problem is the rotors, not trapped air. (That's assuming there aren't any leaks).
JB
[Modified by JB, 5:19 PM 10/22/2003]
JB
[Modified by JB, 5:19 PM 10/22/2003]
Le Mans Master
Joined: Apr 2001
Posts: 5,000
Likes: 1
From: Minneapolis, Mn USA
Re: Break Problem? Need Help. (427V8)
Check rotors for warpage.
If they look good then reinstall on car and check again for runout - side to side - movement. Once these are proven good to within spec by either luck or with shimming under the lugs.
Then take all 4 SS sleeved calipers apart and replace OEM seals with O-ring seals. These will dramatically reduce the effects of any future run-out and car will drive for years without problems with brakes due to sitting over the any period of time.
For even more solid brakes, replace rubber hoses with SS sleeved hoses.
Brent...
If they look good then reinstall on car and check again for runout - side to side - movement. Once these are proven good to within spec by either luck or with shimming under the lugs.
Then take all 4 SS sleeved calipers apart and replace OEM seals with O-ring seals. These will dramatically reduce the effects of any future run-out and car will drive for years without problems with brakes due to sitting over the any period of time.
For even more solid brakes, replace rubber hoses with SS sleeved hoses.
Brent...
