90 vert left front caliper sticking
Pro
Joined: Apr 2008
Posts: 502
Likes: 37
From: Pine Barrens New Jersey
Pretty much only the ABS can isolate each front wheel by itself. It's one line in and a right and left out. So if the other side has no issue then the ABS is likely candidate (given the parts you have already replaced). As a long shot the hard line from the pump to the wheel is available for scrutiny. But that's unlikely given the mileage and probable good condition of the car and it's systems.
I would also ask, how do you know it's sticking since you say it doesn't pull?
I would also ask, how do you know it's sticking since you say it doesn't pull?
Pro
Joined: Apr 2008
Posts: 502
Likes: 37
From: Pine Barrens New Jersey
Pro
Joined: Apr 2008
Posts: 502
Likes: 37
From: Pine Barrens New Jersey
The first thing I would try is unplugging it electrically. Perhaps the self test causes the issue and it will actually function as a bypass unplugged. I can tell you from experience mine didn't.
Pro
Joined: Apr 2008
Posts: 502
Likes: 37
From: Pine Barrens New Jersey
Correct. Mine had all kinds of inconsistent behavior with sticking, no braking, pulling, etc. Unplugging it did nothing to change any of that.
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Pro
Joined: Apr 2008
Posts: 502
Likes: 37
From: Pine Barrens New Jersey
There is already a proportioning valve built into the master cylinder. To bypass the ABS you just need to connect all the lines. A tee for the front and a coupling for the rear. I don't have ABS and voila, I have a great breaking C4 Corvette.
Pro
Joined: Apr 2008
Posts: 502
Likes: 37
From: Pine Barrens New Jersey
The brake lines fittings into the ABS are 10mm bubble flare. So any auto part store has a coupling but this is the tricky piece. It's from an old VW
https://www.ebay.com/itm/METRIC-10MM...4383.l4275.c10
https://www.ebay.com/itm/METRIC-10MM...4383.l4275.c10
Melting Slicks
Joined: Jan 2014
Posts: 2,192
Likes: 381
From: Lunenburg MA
I was able to free mine up a couple years ago. I removed the unit and let it soak in WD-40 for a couple days. Then I figured out which wires under the relays went to which solenoids and activated them on-off with a battery charger until they were all free. Still working fine now. As always, your mileage may vary :-)
Racer
Joined: Dec 2017
Posts: 250
Likes: 41
From: Sydney NSW
I found a place in Australia that repairs Bosch ABS units. Not sure if they'll fix ours or not but I kept the link just in case one day mine goes nuts.
http://www.autoelectronics.com.au/abs_modules_2.html
http://www.autoelectronics.com.au/abs_modules_2.html
Melting Slicks
Joined: Mar 2003
Posts: 2,512
Likes: 49
From: Franklin IN
The rubber brake line to the caliper can degrade over time and prevent the fluid from returning through the system. The line can appear ok on the outside but coming apart on the inside. I had one do this. Easy to check remove the line blow compressed air backwards through the line.