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Major brakes problem 1994 940T 900

posted by  rduke411 on  Sun Dec 22 13:31 CST 2013
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last visit: Sat Mar 1 09:36 CST 2014
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Hi all,

I could really use some help, so if anyone has some suggestions I would appreciate it.

Problem: 1994 940 Turbo was pulling hard to the right. I jacked it up and had my son hit the brakes while spinning each front tire. The right tire stopped immediately. The left tire kept spinning as he pressed the brakes.

I assumed both calipers should be replaced, so I ordered a set. I swapped out the left (non-working caliper) first. I also changed the caliper flexible brake line.

Once changed, I could not get any brake fluid to bleed from the freshly replaced caliper. I ended up doing all kinds of things to try to determine why. Here is what I have determined so far.
1. The line from the ABS block to the caliper is clear of obstruction, fluid flows easily through it.
2. I disconnected all lines from the ABS. Fluid flows easily from the master cylinder lines to the ABS block.
3. There seems to be excessive restriction through the ABS. With my turkey baster, I can pump fluid from the line at the non-working caliper back through the ABS although it seems a bit restrictive. I was able to pump fresh fluid through it until clear. The original fluid was fairly dirty looking.

When I connected everything back up, nothing will come out the line going to the caliper. Even when I take the caliper line and put a lot of suction on it while pumping the brakes - not a drop.

I assume I have a problem with the ABS assembly or the master cylinder or both. I just assumed the problem was the caliper originally. but I suppose that was wrong. Since the right front caliper works, I have to assume I need to change the ABS assembly.


FYI, I have not ever removed lines from the ABS so I don't know if it is supposed to be restrictive or not. Please advise. I would have assumed that it would not be restrictive during normal operation.

Thanks for any tips. I am trying to fix my sons car to save him some money. Looks like I got myself into a mess this time.

Thanks,

Randy






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