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02-24-2003, 05:42 PM
As far as I know, all of 3 series use a system that automatically varies brake bias depending on circumstances. That's part of the reason why you'd see such short stopping distances on m3 (shorter then most of the cars in its class and/or equal weigh).

From this, it would be logical to conclude that the Stoptech's "properly balanced" theory is redundant (since BBS already varies brake bias between front and rear and if, say, fronts grab too much, it would automatically change bios to the rear brakes).

Obviously, the knowledge of how exact logic the system uses to determine where to send more pressure would help on the subject. But I've never seen anything more then BMW's non-technical one paragraph write-up merely informing that such technology is used.


02-24-2003, 06:07 PM

02-24-2003, 06:10 PM
with my dad's 2001 325i the car. There was a separate section that described all the technologies that the car utilizes (ie. DSC, ABD, etc, etc)

02-24-2003, 06:21 PM
4-channel, as in monitoring wheelspeeds at all 4 wheels and independently controlling brake pressure to prevent lock-up at a particular wheel. As I understand it, the alternative is 3-channel, which treats the rear wheels as a single unit for braking (all 4 are still monitored for lock-up).

The only other bias is in having different rotors/calipers in the front vs. back. Your fronts will always need to take the brunt of the braking pressure (unless you're in the habit of driving in reverse at high speeds).

I believe that the "balancing" that aftermarket brake manufacturers mention is more in regards to keeping the brake front/rear bias distribution uniform vs. stock, i.e., same ratio as stock. You don't want your rear brakes overtaking your fronts - causes oversteer? (rears will lock-up because the computer underestimates their braking ratio, reacting by giving them too much braking --- hence, lock-up --> lose rear traction --> oversteer --> NOT good)

I'm sure I got some stuff wrong, but that's how I remember it, so please correct me!


02-24-2003, 06:32 PM

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02-24-2003, 08:18 PM
i believe the bias is self adjusting and variable

02-24-2003, 09:40 PM
equation as well. I am not a brake expert, but the StopTech setup, I believe, is more or less custom tuned to use the existing ABS/DSC controller. This is what I have been told and it's one thing that makes it just a little different than the other setups.<br><img src="" height=99 width=155>

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