94 C-1500 ABS system

big2bird

big2bird

Charter Member, Founder Bird-Run, Cruise-In Bird-R
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So I'm doing a brake job on a 94 Chevy C-1500 truck with ABS today. The right front caliper is dragging REALLY bad, but the hose was just changed. I figure it's the caliper or hardware hanging up. I started with draining the system out the bleeders, like I always do. As soon as I pop the hose on the right front, the pads loosen right up. The master is open, because the reservoir bled right out. Is there a residual valve in these systems?
There might be a obstruction in the old caliper, but this kinda has me stumped.
 
big2bird said:
So I'm doing a brake job on a 94 Chevy C-1500 truck with ABS today. The right front caliper is dragging REALLY bad, but the hose was just changed. I figure it's the caliper or hardware hanging up. I started with draining the system out the bleeders, like I always do. As soon as I pop the hose on the right front, the pads loosen right up. The master is open, because the reservoir bled right out. Is there a residual valve in these systems?
There might be a obstruction in the old caliper, but this kinda has me stumped.
Click to expand...

Is this a 4W ABS? (My '93 1500 just had the rear wheel ABS.)
 
69427 said:
big2bird said:
So I'm doing a brake job on a 94 Chevy C-1500 truck with ABS today. The right front caliper is dragging REALLY bad, but the hose was just changed. I figure it's the caliper or hardware hanging up. I started with draining the system out the bleeders, like I always do. As soon as I pop the hose on the right front, the pads loosen right up. The master is open, because the reservoir bled right out. Is there a residual valve in these systems?
There might be a obstruction in the old caliper, but this kinda has me stumped.
Click to expand...

Is this a 4W ABS? (My '93 1500 just had the rear wheel ABS.)
Click to expand...

Yes. This AM I found some tin foil, no doubt from a brake fluid can seal, at the bottom of the reservoir circuit in question. I am going to replace the master, and power flush the whole system before adding the slaves.
I believe firmly the foil worked its way down the system. perhaps scoring the M/C lip seals as it went. I can even see some foil debri stuck at the M/C intake.:suicide:
 
there should probably be another section of threads devoted to why you don't let someone else work on your vehicles. bubba strikes again!
 
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