No rear Brakes
03-05-2009, 07:35 AM
#1
No rear Brakes If you find out please let me know, As I was driving home one of my rear calipers came off shearing the break line and the E-cable, I installed new Cal's and cable, bled the entire system. When I went to a muffler shop you know when they drive the front wheels on a ramp to slide forward, when the mech tried to stop with the rear brakes there was none, he had to use the E brake to stop the car from rolling forward. I re-bled the brakes, bled the proportioning valve all with no luck, still little to no rear brake..
09-02-2009, 10:22 AM
#6
My car still has the ABS and its a 95. I know they worked before because I have had it at the muffler shop and they never said anything about it until the last time. with the front wheels on the skiff only the rear tires are rolling and when he tried to stop he said it kept going. Had to pull the E-brake to get it to stop..
09-02-2009, 06:18 PM
#7
Have you tried bleeding the ABS unit under the hood?
Also, on a "long shot", after you bleed the ABS unit, re-bleed the rear brakes with the ignition in the "on" position. Some cars need to have the ABS/traction control system energized to properly get all the air out of the system.
Also, on a "long shot", after you bleed the ABS unit, re-bleed the rear brakes with the ignition in the "on" position. Some cars need to have the ABS/traction control system energized to properly get all the air out of the system.
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09-03-2009, 06:27 AM
#8
Have you tried bleeding the ABS unit under the hood?
Also, on a "long shot", after you bleed the ABS unit, re-bleed the rear brakes with the ignition in the "on" position. Some cars need to have the ABS/traction control system energized to properly get all the air out of the system.
Also, on a "long shot", after you bleed the ABS unit, re-bleed the rear brakes with the ignition in the "on" position. Some cars need to have the ABS/traction control system energized to properly get all the air out of the system.
09-09-2009, 11:48 PM
#10
No need for said method. Your ABS controller has it's own bleeder valves. Bleed the ABS unit using the bleeder screws.
10-12-2009, 08:06 AM
#13
My car is still in the build process so I haven't had the chance to do anything with the brakes. But a couple of people that I spoke to that had the same problem just replaced the Proportioning valve with a manual and they said that fixed the rear brake problems...I might have to do the same...
12-18-2010, 10:38 PM
#14
Bringing this one back.
I am just now getting back to trying to solve this problem on my brother's 95 Camaro again. There is absolutely, positively no air in the system. It has been bled from both bleeders on the ABS module along with all 4 wheels. It gets plenty of fluid to the rear when bleeding, but when running it's got nothing.
Tried a new master cylinder, no luck. Also changed it over to LT1 disc brakes tonight (car used to be a sixxer, Z28 clone now, everything correct). The problem is still there. The ABS module is the only thing it can be. I am going to try swapping it with another ABS module tomorrow. If it were my own car, I would ditch the ABS (which I have on several of my own cars). But, he is younger and less experienced and I want him to have ABS.
I am just now getting back to trying to solve this problem on my brother's 95 Camaro again. There is absolutely, positively no air in the system. It has been bled from both bleeders on the ABS module along with all 4 wheels. It gets plenty of fluid to the rear when bleeding, but when running it's got nothing.
Tried a new master cylinder, no luck. Also changed it over to LT1 disc brakes tonight (car used to be a sixxer, Z28 clone now, everything correct). The problem is still there. The ABS module is the only thing it can be. I am going to try swapping it with another ABS module tomorrow. If it were my own car, I would ditch the ABS (which I have on several of my own cars). But, he is younger and less experienced and I want him to have ABS.
12-20-2010, 07:07 AM
#16
Changed the ABS module, no difference. Bench bled the master cylinder again to make sure it was functioning properly, it was. Put it back on and bled the whole system, no change. The only thing I can figure now is that the real brake hose is internally collapsed. Everything else in the system has been changed
12-20-2010, 09:07 AM
#17
This comment applies to 93-97 ABS-VI ABS otherwise known as LT1 brakes. If the rear brakes appear to have totally failed, its possible that the metal gear has fallen off of the rear circuit piston in the ABS module.
If you pull the ABS module out of the car and pull the plastic cover off of the bottom, you will see 3 large metal gears. One gear is fro the rear brakes and the other two are for the two fronts. The gears are keyed and held on by a nut that tends to back off and when that happens, the gear falls off and voila, no brakes. GM should have loctited these nuts but never did.
The middle gear nut did fall off of in mine but the gear was captured by the other two gears so I did not have a total failure. When the gear falls off, the piston in the cylinder will not operate the check valve and therfore no brake fluid flow will occur.
This is the most common failure of ABS-XI brake modules and the reason many pull their ABS but it is a very easy fix.
If you pull the ABS module out of the car and pull the plastic cover off of the bottom, you will see 3 large metal gears. One gear is fro the rear brakes and the other two are for the two fronts. The gears are keyed and held on by a nut that tends to back off and when that happens, the gear falls off and voila, no brakes. GM should have loctited these nuts but never did.
The middle gear nut did fall off of in mine but the gear was captured by the other two gears so I did not have a total failure. When the gear falls off, the piston in the cylinder will not operate the check valve and therfore no brake fluid flow will occur.
This is the most common failure of ABS-XI brake modules and the reason many pull their ABS but it is a very easy fix.
