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      08-29-2011, 02:13 PM   #9
MDORPHN
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Drives: AW 1M
Join Date: Oct 2010
Location: Wash, DC

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Quote:
Originally Posted by tkbr0wn View Post
Yes, definitely need to change your fluid if it's broke.
Motul RBF 600 and stainless steel brake lines, but what I'm experiencing is wholly unrelated to brake fade.

I'm now quite certain that it's due to the "cornering brake control" that BMW fits in many of its new models, including the 1M.

Here is BMW's description:

"Cornering Brake Control (CBC).

For greater safety when braking on curves - Cornering Brake Control stabilises your BMW by applying braking pressure asymmetrically despite physically difficult conditions (e.g. the car swerving towards the inside of the bend when the wheel load changes). Cornering Brake Control (CBC) reduces the danger of vehicle instability that can arise when the brakes are applied while taking a bend at speed. Without CBC, the load shift caused by braking can reduce traction on the wheels on the side towards the inside of the bend, thereby applying excessive load to the other side. This load imbalance may result in a loss of directional control, causing the vehicle to skid out of the curve. CBC counteracts this tendency by asymmetrically distributing brake pressure to the left- and right-side brakes or by reducing pressure (to the rear axle), even if the driver brakes outside the normal range of ABS. The result: a significant improvement in stability and safety when applying light brake pressure, even on bends."


I don't know what is meant by "even if the driver brakes outside the normal range of ABS," but suspect that this explains what I'm experiencing on track. I'd love to get rid of it -- since it interferes with my ability to rotate the car with the brakes -- but figure that would only be possible if I were to totally disable the ABS (which I don't want to do).

Neil