Ryan, make sure that the explorer and gm metrics are similar volume, if they are not you won't collapse the larger volume calipers and you will only use the smaller, all calving, residual, proportioning and such limit pressure not volume, that's controlled by the mc itself and cannot be regulated once pressed. Master power told me this long ago, same reason you can't put wilwoods on the back and gms on the front, on drum backs and disc fronts the mc is metered differently by its piston i was told, this the reason the mc reservoir has two different sizes. I am not an expert but just make sure and check, a lot of rods running around with rear discs not working due to large volume calipers back there!