Yeppers.

 

Man you guys have some strange ideas. I know it is the standard now to use those adjustable proportioning valves but they are crap. Read this and then tell me what you think. http://www.mpbrakes.com/technical-su...nce-valves.cfm

 

I have only the prop valve for the rear, and a Roll Control splitting up the front. No problems whatsoever. I have the rears adjusted to just start locking up at max pedal pressure (matching the front...I love sticky tires). And...with factory disc/drum, it will outstop my '03 GT (once, anyway....don't know about road racing).

 

I reiterate, you want the fronts to lock up before the rears or you run the risk of having the rear come around. A rolling wheel stops the vehicle by static friction whereas a skidding wheel stops the vehicle by dynamic friction. All other things being equal, the coefficient of friction is greater for static than dynamic. A good example of this is when you're pushing a heavy box or piece of furniture across the floor. I don't know about the metering valves, but I'm pretty sure that the orignal disc/drum setup in the 65/66 was just a proportioning valve on the rear.

IMO, the drum brakes are fine for a street driven vehicle but require more maintenance to ensure they are adjusted properly (those auto adjusters blow) and are a bigger PITA to change the shoes versus the drop in pads.

 

OK One last time? Leave the distribution block, hook rear line of mc to it,[ front brakes ] plug rear line in dist block, and install proportioning valve between mc and rear brake line. Right? I have original dist block with one line in and two out. Or trash the dist block and install front brake line direct and tee off for the rears with the proportioning valve between the mc and the tee ? Thanks

 

^ pretty much.

Front line, leave as is.

Real line, drop off MC, connect to prop valve, sent to rear.

If using an adjustable (IMO, they aren't the greatest) you would have to find a quiet place to see how your brakes react and adjust accordingly. The OEM style prop works very well.

 

When you put in a proportion valve, you no longer need the distribution block. The distribution block is only used with a single reservoir MC to ensure that brake fluid gets to both the rear and the front brakes. The Prop valve is used to control the amount of pressure is applied to the rear brakes as opposed to how much is applied to the front. You want less pressure applied to the rear brakes so that the rear brakes do not lock up before the front brakes in an emergency situation. Here is a pic to show you how to hook it up. Again, this is not rocket science. This is just a visual. The rear line is hooked up to the front of the MC.

 

How would you T the front brakes off one fitting on the MC if you dont use the dist block then?

 

I'm talking about the distribution block that is located right next to the MC on a one bowl MC to distribute fluid to the front and back , not the T that is further down line to separate the front brakes.

 

I just now realized that we have some guys in high school on here who may be looking for a more simpler explanation about the physics of the front disk and rear drum brakes and what the proportioning valve really does.
The proportioning valve reduces the pressure to the rear brakes. Regardless of what type of brakes a car has, the rear brakes require less force than the front brakes.
The amount of brake force that can be applied to a wheel without locking it depends on the amount of weight on the wheel. More weight means more brake force can be applied. If you have ever slammed on your brakes, you know that an abrupt stop makes your car lean forward. The front gets lower and the back gets higher. This is because a lot of weight is transferred to the front of the car when you stop. Also, most cars have more weight over the front wheels to start with because that is where the engine is located.
If equal braking force were applied at all four wheels during a stop, the rear wheels would lock up before the front wheels. The proportioning valve only lets a certain portion of the pressure through to the rear wheels so that the front wheels apply more braking force. If the proportioning valve were set to 70 percent and the brake pressure were 1,000 pounds per square inch (psi) for the front brakes, the rear brakes would get 700 psi.