Braking force distribution

[ZaX]

damusto Wrote:Ok maybe I'll try to ask this question differently...

... is there any pressure reducer or regulator for the rear wheels, in stock AE86 braking system ?

To my information - yes.
Part no 47190-12040 VALVE ASSY, PROPORTIONING & BY-PASS
http://www.toyodiy.com/parts/p_E_1984_TO..._4708.html

You can see it here bellow Master brake cylinder. Metal part with two lines in and three lines out.
Two upper are going to the front brakes, one is going back to the diff.
On the diff is the splinter for the rear calipers.

This metal part is different for AE86 and AE85, because AE85 has drum brakes in the back.
If you do the upgrade from AE85 to AE86 you must replace this part, otherwise your rear brakes will be to strong and also overheat.