A4 quattro brake problem..

[Kris Hansen]

Good morning all,

I have a problem with the driver's front brake, the caliper doesn't seem to
want to let go of the rotor. I took the caliper off, cleaned the guide pins,
retracted the piston (which didn't take any unusual force with the bleeder
cracked slightly) put it all back together again, and it still sticks. Has
anyone had an ABS pump unit go bad, where it wouldn't back flow fluid? My
initial thought was caliper, but I am now thinking because of the relative
ease with which the piston pushed in that the actual caliper is not the
problem. The pedal feels fine, though on the second push, it is firmer than
on the first. The only thing I did not do was crack the bleeder with the
caliper stuck, to see if it would release (and spew fluid out, I guess
indicating a blockage upstream?). This is scheduled for this evening.

An interesting note, on the drive home, before I noticed that the brake was
sticking, the car pulled heavily under braking. I gave it some very hard
stops, and it stopped pulling. Any help will be greatly appreciated!!

Kris


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