albertw
Seasoned Member
I encountered an annoying brake assistance in my '24 4BW while cornering at a brisk pace (well below the traction limit - roughly twice the posted advisory speed for the corners). When I tried to brush off a bit of speed mid-corner with gentle brake application the car took over and hammered down the brakes hard enough to engage ABS. The ABS engagement wasn't quick enough to prevent the hard braking from locking up the rear wheels and rotating the car about 10 degrees before one of the nannies (probably ABS catching up) snapped it back into line.
I repeated it several times and it always happened in my usual mode for brisk driving - Sport, but not if I reduced my corner speed by about 20%. Out of curiosity I tried it in Tour and in Competitive Driving and it never happened, even at higher speeds approaching the traction limit.
I can't find anything in the Manual that would explain this. Brake Assist "detects rapid brake pedal applications due to emergency braking situations and provides additional braking" which doesn't apply since I was applying the brakes gently and gradually. Automatic Emergency Braking and Intelligent Brake Assist appear to be ruled out for several reasons. Both work only when a collision is imminent, which was never the case during my testing. AEB works up to 80 km/hr and all my testing was done at speeds above that. IBA requires quick application of the brakes which I didn't do.
The fact that it happened only in one of the three driving modes I tested makes me think it might be a glitch. Has anyone noticed this in their cars?
I repeated it several times and it always happened in my usual mode for brisk driving - Sport, but not if I reduced my corner speed by about 20%. Out of curiosity I tried it in Tour and in Competitive Driving and it never happened, even at higher speeds approaching the traction limit.
I can't find anything in the Manual that would explain this. Brake Assist "detects rapid brake pedal applications due to emergency braking situations and provides additional braking" which doesn't apply since I was applying the brakes gently and gradually. Automatic Emergency Braking and Intelligent Brake Assist appear to be ruled out for several reasons. Both work only when a collision is imminent, which was never the case during my testing. AEB works up to 80 km/hr and all my testing was done at speeds above that. IBA requires quick application of the brakes which I didn't do.
The fact that it happened only in one of the three driving modes I tested makes me think it might be a glitch. Has anyone noticed this in their cars?
