12-05-2012, 03:16 PM
Join Date: Jul 2008
Location: Sunnyvale, CA <-- Ithaca, NY <-- dirty jerz (201) Useful Posts: 25
My Ride: E46 332i,M3;E30 325i
Improves how? Stickiness?
Originally Posted by XKxRome0ox
Help me understand how braking can be improved
I thought a bigger pad and rotor contact area improves braking... but several people have said no
[bimmer app/galaxy s3]
Say the force from your foot/hydraulic system is constant.
The brake pad isn't accelerating, so it's pushing back with equal and opposite force.
Force_friction = mu * Force_normal
And the normal force is what your hydraulics are putting out.
Notice that area plays no part in braking force (stickiness) in an ideal system.
The coefficient of friction, mu, does, which is why you get track pads.
In a real world system, things change. Specifically, you have to consider heat. Bigger rotors are slower to heat and cool, which gives consistent braking.
In fact, if you compare upgraded BMW rotors between different models, sometimes the only spec that changes is that the rotors are thicker.
One benefit to a large pad area is that you don't have to change pads as often if you keep the same thickness.
(klx photo studio)
M3 drive train conversion (S54 Swap, LSD, 6MT, suspension linkage) | UUC Stg 2 Organic Clutch | OEM M-Tech II Kit
KW V2 | BBS GT4 RE | Falken FK452 | Alcon 6-pot 365mm BBK | M3 steering wheel | Powerflex bushings
Originally Posted by koven
i'd rather be gapless with no bulge