brake proportioning valve

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brake proportioning valve

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Corvette >> Corvette Models >> Corvette C3 Forum >> brake proportioning valve

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brake proportioning valve - 4/11/2008 9:16:16 AM

hedgehognj

Posts: 16
Joined: 12/3/2006
Status: offline

Hey Guys,
Help!
1978 Corvette- No brake fluid getting to rear calipers.
How to I reset the proportioning valve?
Thanks in aavance.

Post #: 1

RE: brake proportioning valve - 4/11/2008 10:27:58 AM

Rich G.

Posts: 109
Joined: 1/12/2007
Status: offline

That should reset itself. Try cracking the lines on the master cyl. one at a time while someone steps on the pedal to see if you getting any fluid out there first. Sounds like a bad master cyl. If you changed the master and didn't bench bleed it first you'll never get it to work.

(in reply to hedgehognj)

Post #: 2

RE: brake proportioning valve - 4/11/2008 10:48:17 AM

extanker

Posts: 236
Joined: 1/7/2007
Status: offline

is the pedal very low

(in reply to Rich G.)

Post #: 3

RE: brake proportioning valve - 4/12/2008 5:18:28 AM

hedgehognj

Posts: 16
Joined: 12/3/2006
Status: offline

Hello Extanker and Rich G.

A Little History.
I bought this vette 10 years ago, used it on the street for about a year, then tucked it away. The brakes were always a little spongy, even then.
I'm bringing it out of hibernation now and replaced all calipers, rotors, pads and rubber brake lines.
Master cyclinder bleeds fine as well as the front calipers.
I guess I'll have to just do it right and buy the complete brake line kit and proporting valve from Ecklers.

Thank-You guys for you're time.

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< Message edited by hedgehognj -- 4/12/2008 5:53:58 AM >

(in reply to extanker)

Post #: 4

RE: brake proportioning valve - 4/12/2008 6:14:43 AM

extanker

Posts: 236
Joined: 1/7/2007
Status: offline

do put a new master but i doubt the valve is bad.to get the light off [if it doesnt go out after bleeding] have some one hold psi on pedal then open any front bleeder enuf to SLOWLY let fluid out ,inside guy will tell you when light goes out ,close bleeder right away.if its still on go to any rear and repeat. the trick is to close that bleeder quickly when the light goes out

(in reply to hedgehognj)

Post #: 5

RE: brake proportioning valve - 4/13/2008 4:43:47 AM

Texas Jim

Posts: 451
Joined: 12/15/2005
Status: offline

My 3/4 ton van sat for awhile prior to my buying it and when I replaced the pads, calipers and cylinders, front disc and rear drum, I wasn't getting any fluid to the back brakes. I had to blow the lines out w/ my compressor. There was a clog somewhere in the metal lines going to the rear. I just went through the whole thing from front to back as I figured if it had crud in one place it may have some in another. A semi-time-consuming chore, but the only way to do it right. Good Luck.

(in reply to extanker)

Post #: 6

RE: brake proportioning valve - 4/16/2008 6:41:42 PM

hedgehognj

Posts: 16
Joined: 12/3/2006
Status: offline

Hey Guys,

Thanks for all your advice.
I tried bleeding the master cylinder one more time and you guessed it,nothing but little spirts of air coming out.
Put the new one on tomorrow and see what other trouble I can find.

(in reply to Texas Jim)

Post #: 7