Brake balance?

[Pereldh]

Hiya!

Swapping the front calipers on my Z4M Coupe (same OEM brakes as E46 M3 CSL) for Renault Megane Brembo's, I have a bias question - how much is too much?

According to this list I get 0.5% more front bias (based on the assumption everything w the brakes is identical to M3 CSL).
Is this anything I will even notice?

Edited by Pereldh on Tuesday 3rd January 13:32

[E-bmw]

No.

[stevesingo]

Pereldh said:

Hiya!

Swapping the front calipers on my Z4M Coupe (same OEM brakes as E46 M3 CSL) for Renault Megane Brembo's, I have a bias question - how much is too much?

According to this list I get 0.5% more front bias (based on the assumption everything w the brakes is identical to M3 CSL).
Is this anything I will even notice?

Looking at the table, Megan-R front and stock rear is 1.6% 0.5% with 996 rear calipers.

It should be noted that the change reduces front brake load from 66.9% to 65.3%, meaning the rears will do proportionally more work.

One thing to check is if your M-Coupe has the same master cylinder as the CSL and if either has a brake balance valve.

Edited by stevesingo on Thursday 5th January 19:26

[Pereldh]

True, thanx.
But even if the master cyl is different, and the Z4M has, say, 68/32% front/rear - ONLY changing the front calipers still would only alter the balance by 0.5%..?

[stevesingo]

Some BMW master cylinders have dual diameter, that is a different diameter for each circuit.

I don't recall which models though. A simple part number check on realoem.com might reveal they are the same part.