People with the Wilwood 4pot brake kit

[Turbo-Brown]

Just a quickie, have people been using a bigger master cylinder or is the standard one alright?

Cheers!

Alex

[Dan318-is]

i aint uprated my brakes with willpot

but if u want better braking performance u need a smaller master cylinder and a bigger slave cylinder mate

[Turbo-Brown]

And bigger discs and a larger swept area

I'm guessing that the volume of the calipers is bigger than the old single piston's, but I don't really want the pedal dropping to the floor every time I go to slow down.

[Andy335Touring]

Some good info on here mate

http://e30m3performance.com/installs/in ... c/25mc.htm

[jmc330i]

You got the 280mm kit that was designed for the E30 from Rally Design didnt you??

Have a word with them, I thought all their car specific kits were designed to run with the standard master cylinders.

[Simon13]

u need 17's though as the calipers are massive and stickout alot both sides of the hub

[jmc330i]

u need 17's though

Really? I thought the Rally Design 280mm kit was designed to fit behind 15" wheels - thats what it says in my catalogue and on the web site.

[Sirnixalot]

i aint uprated my brakes with willpot

but if u want better braking performance u need a smaller master cylinder and a bigger slave cylinder mate

that makes no sense.

In the braking system the calipers are the slave cylinders. If you have a caliper with a large fluid capacity and a small master cylinder, the master cylinder will not be able to fill the calipers and extend the piston(s).

If anything you want a large master cylinder and proportionatly smaller calipers.

[Turbo-Brown]

They did just about fit in a set of 15" wheels with a 6mm spacer (my beloved 15" wheels that turned out to be bent )

But the 17" wheels I've got have enough clearance to the back of the spokes to need no spacers

A smaller M/C and larger caliper piston area will give the driver an increased mechanical advantage (more leverage) at the expense of increased pedal travel.

[Sirnixalot]

A smaller M/C and larger caliper piston area will give the driver an increased mechanical advantage (more leverage) at the expense of increased pedal travel.

That i agree with. Once your master cylinder can fully actuate the calipers in its stroke its size is perfect/adequate for the job but it might not meet the drivers personal prefference for feel.