i cant figure out why some of my 70 chevelles have the extra little block in the rear brake line. i guess it is a pressure valve, but why do some have it and some dont. out of all my disc brake cars some do and some dont. if it is not needed, why have it? whats the piont or am i missing something. why and when was it used? or suposed to be used? does anyone know?
pete

I don't have an answer. I just wanted to say, hey! graemlins/waving.gif

From what I've read, the block in the very rear was only used on 70's and its to keep pressure in the rear brake lines to overcome the springs in the drum brakes.

why do only some 70's have it and why is it not neede in other years?

Originally posted by Herb:
I don't have an answer. I just wanted to say, hey! graemlins/waving.gif hey graemlins/waving.gif graemlins/beers.gif

hey pete i don't know the answer but if you happen to have an extra one i could really use it!!!

i dont have an extra one, all of them are on my cars. but if you dont know what it is for, how do you know you need it? :D graemlins/clonk.gif

Good point, Pete.

All kidding aside, I'll research it with a possible expert source I have, and get back to you if find anything.

to be honest pete i think that they are a residual valve that is used for the disc brake cars. i do beleive that rich in new jersey figured out that there are actually two different valves that were manufactured. he was researching info on restoring his 70 drop top.

and i need one to make the brake system at least to appear stock ;)

mine isnt disc brakes and has the rear block... dont know if that throws a wrench into your research

Originally posted by FIG:

and i need one to make the brake system at least to appear stock ;) No you don't, no one can see it anyways :D .

no more comments from the peanut gallery :rolleyes:

You know I can make that car disappear to NJ :D :D :D .

Originally posted by FIG:
to be honest pete i think that they are a residual valve that is used for the disc brake cars. i do beleive that rich in new jersey figured out that there are actually two different valves that were manufactured. he was researching info on restoring his 70 drop top.

and i need one to make the brake system at least to appear stock ;) You are more than welcome to mine. I already bought an LS1 disc setup for the rear of mine and last night when I was removing the brakes from the frame I was wondering what the hell that thing was!!!!! I assumed it was a check valve of sorts. I'll be shipping it from Las Vegas if you're serious....just pay the shipping on it. Email me your address.
graemlins/beers.gif

email has been sent smile.gif

All the 70 disc brake cars I've seen have had the rear residual pressure valve. I wonder if some of the cars without it are former drum cars that have been converted. Many people don't know that valve even exists. Unfortunately that doesn't explain Anthony's non-disc car with one...

well my question is, if it works good with it and it works good with out it, what good is it doing?

Originally posted by FIG:
email has been sent smile.gif Reply sent..... I dipped it overnight to clean it and I'll send it out to you tommorow. Good luck. :cool: