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Suspension Questions Chassis, Brakes, Springs, Shocks, Swaybars, Tire, Rims Etc Suspension Questions Chassis, Brakes, Springs, Shocks, Swaybars, Tire, Rims Etc

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Old 07-16-2017, 09:05 AM   #1
Unkie
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Default Proportioning valve on disc/disc brakes ?

I was chatting with a friend yesterday, and he was telling me about an issue with his brakes on his 56 wagon.
He added disc brakes to the rear, and claims that the rear brakes tend to hang up and not release after a few applications.
Just wondering if the proportioning valve might be the problem, or maybe there's still some air in the system.
He does have vacuum power brake booster, but is unsure of his vacuum level, so that might be another issue, even though it might not be related to the brake release issue.
I just met this fella, and trying to help him out, and I did tell him to get on tri-five.com,join up, and find the answers.
I still think back to the proportioning valve as causing the block for the non release of the rear discs, but that's why I'm asking here.
Thanks for the help.

Later,
Jim
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Old 07-16-2017, 09:45 AM   #2
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Quote:
Originally Posted by Unkie View Post
I was chatting with a friend yesterday, and he was telling me about an issue with his brakes on his 56 wagon.
He added disc brakes to the rear, and claims that the rear brakes tend to hang up and not release after a few applications.
Just wondering if the proportioning valve might be the problem, or maybe there's still some air in the system.
He does have vacuum power brake booster, but is unsure of his vacuum level, so that might be another issue, even though it might not be related to the brake release issue.
I just met this fella, and trying to help him out, and I did tell him to get on tri-five.com,join up, and find the answers.
I still think back to the proportioning valve as causing the block for the non release of the rear discs, but that's why I'm asking here.
Thanks for the help.

Later,
Jim
If it's a disc/drum valve, it could have a residual valve to the rear brakes, causing the problem. It could also be the pedal push rod too long and preventing the fluid from returning, although that may also affect the front brakes the same way.
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Old 07-16-2017, 09:51 AM   #3
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Need to determine if it is a hydraulic problem or a mechanical problem first. If he has air the pedal will feel spongey which should not cause the brakes to engage as they should. Might jack up the car and press the brakes and see if they immediately release, if not open bleeder screw if they release then hydraulic problem if not mechanical. Check all mounting for proper alignment and make sure everything slides as it should. Hope this helps. Also make sure he has the correct proportion valve for his set up.
Also check the brake pedal "free play"
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Old 07-16-2017, 02:13 PM   #4
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Quote:
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If it's a disc/drum valve, it could have a residual valve to the rear brakes, causing the problem. It could also be the pedal push rod too long and preventing the fluid from returning, although that may also affect the front brakes the same way.
I agree with Don, if he had drums on the rear prior, and didn't switch the Prop Valve to a disc/disc at the same time he converted to rear discs that could be the problem.

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Old 07-16-2017, 05:03 PM   #5
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Quote:
Originally Posted by acardon View Post
If it's a disc/drum valve, it could have a residual valve to the rear brakes, causing the problem.
x 3
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Old 07-17-2017, 07:53 AM   #6
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Thanks fellers for the replies and info, I'll pass it on to him, I appreciate the help, and he will also.

Jim
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Old 07-17-2017, 11:37 AM   #7
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Was the MC changed at the same time disc brakes were installed??
The residual check valve is in the MC...
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Old 07-17-2017, 12:17 PM   #8
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Converting a combination valve. http://www.classicperform.com/Instru...structions.pdf
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Old 07-17-2017, 02:03 PM   #9
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Was the MC changed at the same time disc brakes were installed??
The residual check valve is in the MC...
That would depend on the MC right? If he already had discs on the front he might not have a residual valve in the MC. (for example my corvette style MC from CPP does not have one)

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Old 07-17-2017, 07:20 PM   #10
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That would depend on the MC right? If he already had discs on the front he might not have a residual valve in the MC. (for example my corvette style MC from CPP does not have one)

Ace
I'm assuming he had drum brakes on the rear before the disc were installed with a master cylinder for disc/ drum brakes...
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