Hey guys, I’ve been using the Book of Kirby for a couple years now, so this is my long-overdue first post.
After a mechanical refresh, the first couple test drives in my car (1989 V12, with ABS) showed that the left front brake was dragging. I rebuilt the calipers and replaced the pads, rotors, and hoses. I found some sort of scale or crystals inside the calipers, which I cleaned out.
Surprisingly, this has not fixed the problem. The left front caliper does not release when you take your foot off the brake. The interesting thing is that relieving the pressure by opening the bleed screw or even cracking the line at the ABS unit causes the caliper to release as it should.
I can take another shot at rebuilding that caliper, but it seems like the caliper is working. I can also try rebuilding the master cylinder in case it’s afflicted with the same deposits as the calipers, but it seems strange that only one wheel would be affected. Last option would be to disassemble the ABS module.