Im getting ready to Plumb my brakes on my 36,,I bought the master and pedal from speedway,it looks like a GM master,,si the bigger of the 2 resevoirs for the front brakes??
thanks jim
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http://community.webshots.com/user/jimcaf12

Jim, I have asked this question myself to one of this industry's guru's. Here is what I was told:

1.) GENERALLY, the larger reservoir is plumbed to the DISC brake circuit.

2.) GENERALLY, the reservoir closest to the push-rod end of the master cylinder is for the PRIMARY brakes, which is normally considered the FRONT brakes.

......I look forward to reading other responses to your question. While I do not doubt the info I was given, it seems to me there are no hard-and-fast rules, as the different manufacturers had their own theories.

It is important to know if your m/c has built in residual pressure valves, or not. ....If it does have them, they may not be correct for your application. ....If it does NOT have them, you MAY need them for your application.

Also, there is a difference between power and non-power master cylinders, so use the right m/c for your application.

> Also, there is a difference between power and non-power
> master cylinders, so use the right m/c for your
> application.

What is the difference? I asked for a non-power master for the car my brakes are from. I was given a master the seems to work just fine. Later I tried to look up the non-power master, and can't prove it was ever offered without power brakes.
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Steve@OldSub.com

Steve, the way I understand it, the depth of the recess (in the piston) for the actuating rod may be different for a power and non-power application.

I do not know for certain if that is the only difference.

In a brake parts catalog which I have, there are different master cylinder part numbers for power and non-power brakes for SOME applications. ... Other applications use the same part number, regardless if power or non-power.

I agree with Bruce on the mc. The larger res. would be for the disk brakes, which have a larger size piston.
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phil


It's not a NOMAD, it's a Yeoman!
Not an engineer, but I DO drive a train.

the big is for the front,,i suspected that being the front calipers look like they would hold more fluid,,
Thanks,,,now i know for sure,,jim
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http://community.webshots.com/user/jimcaf12

The front brake systems have always been larger for the front for both drum and disc and I've assumed from that that the larger resevoir of the mc should be used for the front...I've never figured out how to tell if they have the proportioning valve built in or not but someone once said that it doesn't matter if you install them in the lines and they are also in the mc except you use 2 lb for disc and 10lb for drums...it was also mentioned not to use a mc for front drums in a front disc system.. anyhow, when I followed the instructions on the boot heel, everything worked well using Master Power Brakes universal power system.
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Fred P.