Thread: calculating front to rear brake %'s

the easiest way is to put it on a dyno roller and test them.

you can calculate it roughly by working out the piston surface area of the front and rear calipers and then expressing that as a percentage.

if you have a brake pressure modulator of any kind you have to work it out as the overall force that the calipers can exert which is the calipers total piston area multiplied by the fluid pressure. do that for front and rear and then express them as a percentage.

from memory the split is 60/40

This is an expansion of Mr BK's dyno suggestion

Safe-T-Stop - Brake, Steering and Suspension Safety Test

One of their reports came with the RR I picked up in Vic. Strange as it seems it was 70/30 f/r, but it was a 20 yo vehicle after all. It even measured variations L/R on each axle. ( 13% FNS, 27% RNS)

I may well be wrong but werent the orignal RR twin pot twin piston fronts with single pot rears? This would make some sense to the large % difference

Serg

Originally Posted by Blknight.aus

the easiest way is to put it on a dyno roller and test them.

you can calculate it roughly by working out the piston surface area of the front and rear calipers and then expressing that as a percentage.

if you have a brake pressure modulator of any kind you have to work it out as the overall force that the calipers can exert which is the calipers total piston area multiplied by the fluid pressure. do that for front and rear and then express them as a percentage.

from memory the split is 60/40

Regarding calculating it, would pad size come into play?

what are the piston sizes and number of for front and rear of a 1998 Def 110 trayback

Serg

yep, thats why I said roughly calculate.

Originally Posted by Blknight.aus

yep, thats why I said roughly calculate.

cheers,
do you know the front and rear piston sizes?

not off the top of my head no.

out of curiosity why do you want to know the brake bias?

(send me a PM tonight And I'll dig the raves/rps/emei/partsmanuas and see if I can find enough to give you a close enough to right answer)

so i can calculate the amount of anti-dive on my truck and play around with some front end designs.