How to tell if a caliper piston is still good? (Page 1/1)
tjoudrey
FEB 10, 11:25 PM
I am in the process of rebuilding the rear calipers on my 85. Upon visual inspection the internal nut is extruding farther out than the other, as well the inner mechanisim appears to be slightly crooked. How do I test if this piston is still any good?
The piston is early version unit w/o 4 notches on front to accept stamped SS clip for the inner pad. (Should have a wire clip doing this.) I think this version is part of brake recall.
Is started to "blown out" the back because can't self adjust. Front should have vent plug to keep out most crap makes worse rust problems when is missing.
More proof? put piston in the bore w/ park screw and everything on it except the big spring and "o-ring" seals. Very likely you can't "retract" the piston fully by hand even w/o the big spring so new pads and rotor can fit. IOW piston height ≥ 5mm - 3/16in
Get rebuilt caliper from AZ etc w/ a good warranty. AZ uses Phone # to track warranty nation wide.
------------------ Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should. (Jurassic Park)
