Is the poroportioning valve needed? - Team Camaro Tech
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post #1 of 4 (permalink) Old Feb 5th, 06, 02:09 PM Thread Starter
Join Date: Jan 2001
Location: 115 Hidden Bay Dr. Sumter, SC
Posts: 26
Question Is the poroportioning valve needed?

I just upgraded to 4 wheel power disc brakes on my 69 camaro. I have a proportioning valve that came with the kit but it keeps tripping every time I push on the pedal and it won't let fluid get to the back brakes. I removed the valve inside of it (which made it a junction block) and I was able to get fluid to the back because now the dual master cylinder feeds both the front and back at the same time. I don't want to leave it this way because if I have a brake failure I'll loose all my brakes. How can I eliminate the proportioning valve and still have a safe system? Any help will be greatly appreciated since the Hot Rod Power Tour is coming soon and I have to be ready, going for the long hauler this year first timmer. Thanks

ZFINE69/69Z (Clone) Hondorus Maroon W/Black Stripes, Original White Interior, 350 W/Edelbrock Crossram, 4 Speed, 355 12 Bolt, S/S Cragers
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post #2 of 4 (permalink) Old Feb 5th, 06, 08:01 PM
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Join Date: Jun 1999
Location: Ewing, NJ 08560
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Re: Is the poroportioning valve needed?

Take a good picture of your master cylinder and valve setup so we know exactly what you're referring to. Post it here so we can make sure we're talking about a proportioning valve vs the check valve.

Jeff H
69 Z28 Hugger Orange original factory JL8 brakes, being restored
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post #3 of 4 (permalink) Old Feb 5th, 06, 08:27 PM
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Join Date: Apr 1999
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Re: Is the poroportioning valve needed?

On a disc/disc setup typically a prop valve of some sort to reduce pressure to the rear brakes allowing the fronts to lock first is required. It's about finding a balance and one of the reasons to put a smaller rotor and caliper in the back. Using an adjustible prop valve allows you to really dial your braking compared to a fixed valve.

Pic's of what you have would really be a good idea as Jeff suggests...


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post #4 of 4 (permalink) Old Feb 6th, 06, 08:36 AM
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Re: Is the poroportioning valve needed?

For front to rear bais you can use a dial type valve and do the same thing.

SUM-G3905 Summit Brake Proportioning Valves
Brake Proportioning Valve, Knob Adjustment, 1/ 8 in. NPT, Single Inlet/ Outlet, Aluminum, Natural, Each

68 Camaro~LSx ~all motor
1.54 60'--6.95 @ 98.45 660'--10.96 @ 121.53
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