I am planning on upgrade the brakes on my 89 535, I have read up and found that I could go with E31 (8 series) fronts and E34 540 rears. It seems pretty easy to find the 540 rears but the e31 fronts are hard to get and from what I gather, rather expensive. The other option for the front would be the e32 740/750. I know how much force the 8 series fronts produce but dont know what the e32 brakes make. I can get everything for $700 (calipers, rotors, pads) for the e32/e34 setup. Should I wait around and find the 8 series fronts or if I am just using the car as a daily driver should I not spend the extra money?