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Re: Replacing ABS system (long) Posted by Shaun [Email]  (#683) [Profile/Gallery]
(more from Shaun) on Thu, 3 Apr 2003 07:52:12
In Reply to: Re: Replacing ABS system, Ari  [Profile/Gallery]
, Thu, 3 Apr 2003 07:07:14
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Thanks Ari, this is what I have done. 8 monhts ago, I determined that the pump worked fine, but it was not being told when to turn on. I discovered that by grounding terminal 85 on the ABS relay, the pump worked fine. I got a new relay. Still did not work. I connected a rocker switch in the cabin back to 85 and a ground, and I become the pressure switch. Here's how that system works: When pressure is low in the system, the ABS/TCS lights come on. I turn on the rocker and the pump operates, AND the brake fluid light comes on. In about a minute, the break fluid light first goes out, and then the ABS/TCS lights go out. I use the brakes and the whole system repeats itself.
I took the car to Charles River Saab for a proper diagnosis, telling them about my circuitry going around the ABS pressure switch. The came back with a code that said my left front ABS valve was blocked and I needed a $1476 pump. I then "real-world" tested this theory (which made no sense to me from an electrical standpoint, and took the car to a Wal-mart parking lot early the next morning and did several, controlled "high" speed emergency stops. The ABS worked fine. I would have predicted the left front wheel would have locked, but it didn't.
Happy with my switch, the car stayed this way for several months. I then took it to Mecca Motors and told them about my "fix" and that I thought the pressure switch was bad. They put a new one in, but that did not fix the problem. That was 3 months ago.
There is one problem with the switch, and that is sometimes you forget to turn it off, leaving the pump on. The pump still works fine, but it seems like the pressure drains very fast, and as I have read, that may by the accumulator. Finding a complete, working system from another 92 turbo, I jumped at the $100 price and thought that it may be most prudent just to do a complete swap.
To wrap it up: pump works, accumulator may be bad, circuit to replenish pressure is bad.
That's my story. What do you think?
Shaun
posted by 204.68.173...
, Wed, 2 Apr 2003 13:47:29, Thu, 3 Apr 2003 07:07:14, Thu, 3 Apr 2003 07:52:12 <-- Viewing This Message, Thu, 3 Apr 2003 13:36:21, Fri, 4 Apr 2003 14:43:51, Wed, 2 Apr 2003 19:01:08
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