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Jul 21st, 2025 | | | | Joined: Jan 2009 Posts: 54 'Bolter | | 'Bolter Joined: Jan 2009 Posts: 54 | I just converted my 56 chevy pickup to disc brake conversion from CPP. The problem I have is the front passenger side caliper locks up when pedal is depressed and wheel will not turn when I let off the pedal. Do I need a proportioning valve?
| | | | | Joined: Jan 2016 Posts: 631 'Bolter | | 'Bolter Joined: Jan 2016 Posts: 631 | You do need a proportioning valve in the system ..........but not to solve your current problem.
Will not turn when you let off the pedal..........sounds like pressure is being trapped or held in the caliper or mechanical binding.
Brake master not returning completely after application would cause caliper lock.
Did you install pressure check valves in the caliper lines ?
Last edited by showkey; 05/05/2018 12:58 PM.
| | | | | Joined: Jan 2013 Posts: 2,194 Moderator: Interiors, Texas Bolters, Name that Part | | Moderator: Interiors, Texas Bolters, Name that Part Joined: Jan 2013 Posts: 2,194 | Trucknut,
I would check a couple things, Order doesn’t matter. How is the brake peddle return spring? Check linkage for binding and correct setting (peddle to master cylinder linkage might be too tight) Double check brackets that hold your disk brake caliper. (Mine was not true and I had similar issues with cpp conversion kit.) consider rebleeding your system. You should have portioning valve if you are running disk (front) and drum (back) set up.
Just a few thoughts after having a similar issue.
Chris | | | | | Joined: Feb 2004 Posts: 28,674 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 28,674 | If only one wheel is locking the problem is in the caliper or the flex line going to that side. Try loosening the bleeder screw to the locked-up brake and see if it releases. If so, replace the flex line. If not, replace the caliper. "New" doesn't always mean "good".
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Mar 2010 Posts: 10,059 Renaissance Man | | Renaissance Man Joined: Mar 2010 Posts: 10,059 | "New" doesn't always mean "good".
Any more these days, 50% chance of being "good" is becoming the new normal.
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
| | | | | Joined: Jan 2009 Posts: 54 'Bolter | | 'Bolter Joined: Jan 2009 Posts: 54 | Hey ndkid275 what did you do to fix the problem you had with cpp mounting? | | |
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