R & R ABS Pump/Module.
Racer
Joined: Oct 2008
Posts: 299
Likes: 1
From: Ottawa Ontario
I was looking at mine the other day and it looks simple to replace. Everything is all in one spot and somewhat easy to get out as a unit. Mine doesn't appear to work yet doesn't throw any codes so I've been wondering if I should replace it or not.
Thread Starter
Safety Car
Joined: Feb 2000
Posts: 3,771
Likes: 0
From: MANDEVILLE, LA La
I wonder how hard it is to bleed it> I read in the FSM there's a self bleed mode?
Team Owner
Joined: Dec 1999
Posts: 34,873
Likes: 487
From: Lacey WA RVN 68-69
NCM Sinkhole Donor
Once you replace the module, the best way to bleed it is with a GM Tech II Scan tool with the necessary brake module. To properly bleed the ABS pump, it has to be running and that is what the scan tool is for operates the ABS pump).
Because there is no bleed valve like the calipers have, it will be a messy job. Also from I remember, they are pricey.
Because there is no bleed valve like the calipers have, it will be a messy job. Also from I remember, they are pricey.
Thread Starter
Safety Car
Joined: Feb 2000
Posts: 3,771
Likes: 0
From: MANDEVILLE, LA La
Once you replace the module, the best way to bleed it is with a GM Tech II Scan tool with the necessary brake module. To properly bleed the ABS pump, it has to be running and that is what the scan tool is for operates the ABS pump).
Because there is no bleed valve like the calipers have, it will be a messy job. Also from I remember, they are pricey.
Because there is no bleed valve like the calipers have, it will be a messy job. Also from I remember, they are pricey.
I guess you break the lines to bleed it? Must be quite messy.
New they are very expensive.I bought a Good Used one for $85.00
Drifting
Joined: Sep 2003
Posts: 1,483
Likes: 4
From: middle TN
Bled mine about two years ago and don't remember it being messy. Just a hassle to climb back in there while having someone in the driver's seat to work the brakes.
FSM spells out the procedure pretty clearly.
FSM spells out the procedure pretty clearly.
Thread Starter
Safety Car
Joined: Feb 2000
Posts: 3,771
Likes: 0
From: MANDEVILLE, LA La
Le Mans Master
Joined: Dec 2000
Posts: 7,839
Likes: 22
From: San Diego, Ca
Pump only works when activated moving fluid from accumulators back to line pressure so there's nothing to bleed. You can bleed the brakes as usual or crack lines at the Module to speed things up.
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Thread Starter
Safety Car
Joined: Feb 2000
Posts: 3,771
Likes: 0
From: MANDEVILLE, LA La
We changed it out yesterday took about 45 Min. then another 30 or so to bleed at the wheels.Brakes feel pretty good. We thought that air would be introduced into the system from the pump cycling? I guess that's not the case?????
Last edited by CAJUN C4; Jun 8, 2009 at 01:05 PM.
Le Mans Master
Joined: Dec 2000
Posts: 7,839
Likes: 22
From: San Diego, Ca
You'd only churn air if it was in the system - it doesn't add anything. Pump only works when activated and since everything that gets to a cylinder goes through the Module first, bleeding each wheel takes care of it. I'm beginning to wonder if anyone knows how it works? ABS doesn't increase line pressure. It blocks/reduces pressure to prevent lockup and the fluid is shunted to an accumulator and pumped back to line pressure. It's pretty simple really and we seem to get our hair in a knot over what needs to be done. Of course early users - like Law Enforcement - didn't get it either and when they started crashing into people and cars - because they were still pumping the pedal - they sued the OEMS for defective design.
