Brake Questions - Help

dennisonwj said

Attached is another picture of the block with labels.
On the car now there is no device rear of this one, there is only a device on the rear axle that the "TO rear drums" line goes to. It splits from there and goes to the rear drums. That COULD be a metering valve, but I am not sure. Today, I picked up a MC from AutoZone (https://www.autozone.com/brakes-and...master-cylinder-brake-system/4143_0_2558_2867). See pic. This was designed for front disc and the rear reservoir that goes to "FROM MC reservoir to front brakes" is larger than the one to the rear brakes by a little.

Is it possible this is a combination valve that does proportioning, distribution, and brake failure alert all in one? Note : there is no wire connected to it to throw the brake warning light on the dash, I have not gotten to fixing that yet. I mean, really, they light will go on to tell you that your brakes failed as you hit the pedal, you will feel the problem when you hit the pedal, is that light necessary?



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Well the prop valve should be on the that line. So it looks likethere is no proportioning valve on your car.
Correct - the rear brake line should go from the distribution block with the warning light switch, to the prop valve and then the hose with a Tee on the rear axle's vent. If you read the booklet, it explains the hydraulic pressure is not proportioned until something like 500 psi. So for light braking, whether it is present or not will not be noticed. At lower speed and dry pavement it will be harder to lock up than slick pavement and higher speed braking.

You can buy a texas shaped prop valve.
Yes, you can also buy a combo valve used on the later years. There are pictures of the same collection of Master Tech Bulletins. They are bigger and you'll not mistake them for the simple safety switch type.

That Master cylinder doesn't look correct. If it works, its only for the same reason the one you have works. They removed the residual valve.
All master cylinders for the a-body disk brakes used a bail retainer, not a bolt. There's a list on the last page of one of the master tech booklets.
All chrysler master cylinders use a different thread for the rear brake and front brake connections at the master cylinder.

Yea I know the brake light warning may be too late. LOL. But maybe in some cases it will help.