topley

Hi all.. putting my front end together on my race car. Updated Hubs and adapters to use M030 (928 S4) Brembos. I bought used a while ago and just getting around to putting them in. Not sure if they are M030, S4 or 993 calipers originally and I thought it was only the bleeder location that was different between mounting front of disc to rear of disc. Trying to figure out what I have. Been looking up pics of S4 and M030 calipers and it seems that some have the larger bore piston near the bleeders and some have the smaller bore near the bleeders. I'm hoping that it is the larger bore that is at the top near the bleeder in a 944/968 orientation but I'd like confirmation.

BTW my confusion comes from seeing pics where larger is on top like:
http://www.jackals-forge.com/lotus/968cs/beard/m030.jpg

and larger on bottom like:
http://forums.pelicanparts.com/uploa...1259698327.jpg

Thanks

Jfrahm

The larger piston should be trailing the smaller one given normal rotor rotation so that should always be the same but bleeder position is determined by where they mount which I think is 2 o'clock on the LF on a 928 or 944 Turbo, but 9:00 - 11:00 on a 911.

-Joel.

mj951

Rebuilt M030 caliper off an '89 944 Turbo.
Bleeders mount to the top as mentioned.

topley

Thanks guys. Thats what I thought but I saw too many photos of incorrect mountings that I was starting to doubt myself.
Thanks for the confirmation.

thomasmryan

Looking at the PET, the front caliper has the larger piston first in the direction of rotation and the rear has the smaller piston first in the direction of rotation.

But always, bleeders face up.