'75 Duster B body front brake upgrade impressions wanted

340fourspeedDuster said

I am looking at doing this one step at a time. 11.75" first. My rear brakes on the 8 3/4" are 10" x 1.75". I do have a backing plate to drum set of 10" x 2" in the garage. So it sounds like the Dr. Diff stage 2 setup will be what I am looking for. The tires are the BFG G Force Comp 2 A/S 215/45ZR17 up front. These clear the fender. Putting large drum brakes on the rear (more coefficient of friction) means that there needs to be more rear pressure bleed-off, yes?

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If you upgraded the rear brakes without upgrading the front, yes, you'd need to use an adjustable valve to lower the pressure to the rears to keep them from locking up first. But, if you upgrade the front brakes first it may not be necessary. The bias needed front to rear depends on a lot of things, the size of the brakes is one. The weight balance of the car, size of the caliper pistons and rear wheel cylinders, tire sizes front and rear, even the suspension set up changes what the bias needs to be.

I know on my cars, when I was running 11.75's up front with 11x2.5" drums out back they were pretty well balanced for brake bias with the factory combination valve.

10x1.75" rear drums? So you're still running SBP axles out back?