Wilwood Caliper issue

[6768chevylover]

I had installed the d52 calipers on my 71 blazer 4wd. I Think They work great when they work. My issue is that my one caliper seems to be partially seized. I can move the piston in with a C clamp. When I install it back on and step on the break, the caliper will not release from the rotor once I release the pedal. Any ideas on why this is happening? Thanks, Mike

[cleszkie]

Are you running rubber soft lines to the calipers? Have you replaced them recently? When these lines get old, the interior plies can delaminate and a flap will form. This can cause a blockage in the line that either won't let the fluid pressure release, or won't let the pressure get to the caliper, depending on which way the flap is positioned in the line. I've seen this before. Just a thought.

[6768chevylover]

Cleszkie, almost everything on my braking system is about a yr old except the Proportioning valve. It might be original. Hoses are braided ss. Could pro valve be going?I just noticed the other side is rubbing on the rotor and has some drag when I spin the wheel.

[hemi43]

Next time the caliper stays locked onto the rotor, loosen the banjo fitting at the caliper or loosen the bleed nipple. If the caliper then releases, then you know you have a problem further up. If the caliper doesn't release, then you'll know you have a seized caliper.

[cleszkie]

Originally Posted by hemi43

Next time the caliper stays locked onto the rotor, loosen the banjo fitting at the caliper or loosen the bleed nipple. If the caliper then releases, then you know you have a problem further up. If the caliper doesn't release, then you'll know you have a seized caliper.

X2 - This is a good way to further isolate the problem.