The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1969 - 1972 Blazers and Jimmys Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 05-31-2018, 08:25 AM   #1
6768chevylover
Registered User
 
6768chevylover's Avatar
 
Join Date: May 2007
Location: nepa
Posts: 698
Wilwood Caliper issue

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
6768chevylover is offline   Reply With Quote
Old 05-31-2018, 09:09 PM   #2
cleszkie
Senior Member
 
cleszkie's Avatar
 
Join Date: Feb 2003
Location: Santa Ana, CA
Posts: 2,086
Re: Wilwood Caliper issue

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.
cleszkie is offline   Reply With Quote
Old 05-31-2018, 09:16 PM   #3
6768chevylover
Registered User
 
6768chevylover's Avatar
 
Join Date: May 2007
Location: nepa
Posts: 698
Re: Wilwood Caliper issue

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.
6768chevylover is offline   Reply With Quote
Old 05-31-2018, 09:58 PM   #4
hemi43
Registered User
 
hemi43's Avatar
 
Join Date: Mar 2015
Location: Newcastle Ontario Canada
Posts: 1,013
Re: Wilwood Caliper issue

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.
__________________
The one that dies with the most tools, wins !
hemi43 is offline   Reply With Quote
Old 06-04-2018, 01:20 PM   #5
cleszkie
Senior Member
 
cleszkie's Avatar
 
Join Date: Feb 2003
Location: Santa Ana, CA
Posts: 2,086
Re: Wilwood Caliper issue

Quote:
Originally Posted by hemi43 View Post
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.
cleszkie is offline   Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 06:28 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2018, vBulletin Solutions Inc.
Copyright 1997-2013 67-72chevytrucks.com