carnuck said:
Later I'll be putting in an adjustable proportioning valve.
I was going to suggest that, sounds like a good plan.
For others, unless your doing brake upgrades both front and rear, and installing an adjustable proportioning valve, I'd say stick with the stock wheel cylinder.
If you've got big tires, but stock brakes and trouble stopping the big tires, at the very least, I'd get aftermarket pads/shoes that have greater stopping force than OEM and direct replacement pads/shoes.
If your getting into swapping in bigger brakes not designed for your particular application, then you most likely will need an adjustable proportioning valve.
8Mud, what I've read on P.U. extra proportioning valve, I agree with your assesment. My mini-vans have had the same thing and I've dealt with them before. You may know this, but that 2nd proportioning valve (connected to the rear suspension to change rear brake proportioning according to the load on the rear suspension) is designed to work with a specific 1st proportioning valve.
Basically the 1st proportioning valve has a much higher ratio biased toward the rear, than most single proportioning valves. The 2nd proportioning valve is designed to step down that higher pressure even more.
So, if you eleminate the 2nd proportioning valve, you have to replace the 1st proportioning valve with the appropraite proportioning valve that provides the correct step down in pressure. Vice-a-versa, you add a 2nd Proportioning valve, you got to swap in the appropraite 1st proportioning valve.
Some people rig up their
Adjustable Proportioning valve so that its in the passenger compartment, or it sticks thru the firewall with the knob in the passenger compartment. So that you can adjust the brake proportioning easily at any time, including while driving.