Rear disc brakes

[gremlin]

I was at the junkyard yesteday and a 93 Mercury Marquis caught my eye. It has a disc brake rear end. Any body know if this set up will fit an 8 1/4 or 8 3/4? I couldn't get the disc to come off so I couldn't measure from axle flange to housing flange. I will go back this week with a few extra tools and get that sucker apart to measure. Is the A body 8 3/4 and 8 1/4 axle flange to backing plate measurements the same? If no one answers this I will update ya'll. :salut:

 

[gremlin]

Well it looks like I am going to have to move/open up the hole spacing to match the flange on my housing. Other than that it looks like everything else will fit.

Now, should I use the disc/drum master cylinder for the Mopar or the disc/disc master cylinder and proportioning valve from the Ford?

 

[GotDart]

Cool find. What is the diameter and thickness of the rotors? Are they solid or vented? Are the calipers single piston?

Not sure what master cylinder to use. But you should be able to use a disk/drum I would think. One thing to watch out for is that there is usually a residual pressure valve somewhere in the drum brake hydraulic system. Sometimes it's part of the wheel cylinders, but it can be built into the master or an add on check valve somewhere in the line. You will also probably need an adjustable proportioning valve to set the biasing properly.

Ohh, and what kind of parking brake setup did the donar car have? I'm pretty sure TxDOT requires a functioning parking brake for safety inspections.

 

[gremlin]

Solid rotors, single piston. Didn't measure the dia. or thickness. I figure if it will stop a Marquis, it ought to stop a Dart. I stuck a 15" rim off of a Fury on it and saw no clearence issues. It probably should use approx. 1/2 longer wheel studs. I have 14 ralley rims so I will put a 14 rim on there before tearing it apart out of hopes I don't have to buy bigger rims. The emergency brake uses a cable. It looks like it should be fairly easy to hook up, but some how it never ends up too easy. It is part of Tx safety regs.