I went out and looked at a 48 Suburban and 53 sedan. Suburban looks level, and the sedan looks like the master cylinder is lower. But I don't believe the elevation makes any difference. Brakes are a closed hydraulic system, if the wheel cylinder cups would hold pressure, they will hold air under a little vacuum. Try draining a wheel cylinder by unhooking the hose and sticking it in a cup of brake fluid. It won't drain. On the positive side, if the wheel cylinders are high it should make bleeding much simpler. You don't have to force the air down hill, you just have to encourage it to go up.(quoted from post at 14:51:31 01/01/16) Now OLD if you think about the old chev the master cylinder was just a little above the wheel. Not much but a little. Hope this finds you finding your goats alive and things looking up.
I'm always surprised when Guido is right!(quoted from post at 16:13:38 01/01/16) Hello DIM,
Old style drum and shoe brakes have a residual presure of 7#. Location of the master cylinder does not matter!
Guido.
(quoted from post at 20:23:49 01/01/16) Hello rustred,
The answer to his question Is a resounding NO! A have some questions for you though.
1: Do you know what a residual pressure valve is.?
2: Do you know what is its purpose.?
3: Where is it located.?
4: Is it even part of the braking system.?
Most importantly: could you answer all the above questions on a multiple question test?
Guido.
Not arguing, I just don't understand how brake fluid could drain downhill into a master cylinder unless there was an air leak or air in the brake fluid. Vapor pressure of brake fluid has got to be pretty high, it wouldn't break into a vapor until well over 30 ft of elevation change.(quoted from post at 19:46:45 01/01/16) the lines being higher than the master cyl. is part of the problem. lines connect to btm of master and never are looped higher than the cyl.the master cyl. fluid compartment is the highest point in the brake system. the fluid is draining back into the master which causes you to pump the brakes to get the fluid back to brakes. that is where the residual valve comes in ... to stop this and keep a bit of pressure on the line.
(quoted from post at 18:17:05 01/01/16) Hello Andy Martin,
Anecdotal vs factual. Got to love it!
Guido
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