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Re: 1970 GMC 2500 2WD 8 Lug disc brake conversion
A couple of things that I don't think I touched on.
Master Cylinder
When converting from drum/drum to discs/drum you have to keep in mind that where on the drum/drum MC the leading port goes to the front and the rear port goes to the rear, on Disc/Drum MCs this is flipped. Front port is for the rear drums and the rear port(closest to the firewall) is for the front discs.
Metering, proportional, and pressure differential valves, oh my!
On my neighbors '70 GMC it does not have a combination valve as I had posted earlier. What it does have is a Pressure Differential Warning Valve. All this is a simple shuttle valve inside, if one of the systems fail the pressurized side will push on the shuttle which will then activate the brake warning light inside the cab. That's it. It does not close off the leaking side, nor is there any kind of metering valve inside.
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-Michael
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