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E90 M3 (Sedan) | E92 M3 (Coupe) | E93 M3 (Convertible) (2008-2013) {Engine: S65 - Max Hp: 414 hp (420 hp Euro) at 8,300 rpm / 295 lb/ft at 3,900 rpm}

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Old Fri, May-13-2011, 04:44:11 PM   #1
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Default Brake question

I saw a post on a Corvette Forum about an instructor who was teaching a student in an '08 M3 at Watkins Glen. At 130 mph, entering the downhill braking zone-no brakes. The rookie driver spun the car, and scrubbed off most of the speed and eventually the car backed into a barrier at relatively slow speed doing minor body damage.

On inspection, the left front brake line had popped off the banjo joint at the caliper.

Questions: Any one else have this happen? Speculation was that the brake line had been stretched during a caliper repair.What type of dual system does the M3 have? Front rear, diagonal? He used the parking brake to help stop. Wld the stability management system help, or wld it be non-operational due to brake problem?

This is more than idle curiosity as I am headed to a track day at Mid-Ohio this Monday and I can hit 140 mph on the back straight.
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Old Sat, May-14-2011, 10:18:38 AM   #2
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Default Re: Brake question

To me anyway, most if not all modern cars (2000+) have a dual braking system. Losing one brake is not going to compromise the entire system...there would still be some braking. I would guess that he had over-cooked his brakes and he ended up with total brake fade from the heat. It's also common practice in a spin, when all else fails, to use your parking brake to help stop. If I also had time, I'd open the door and drag my foot to help stop.
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Discussing Brake question in the E90 M3 (Sedan) | E92 M3 (Coupe) | E93 M3 (Convertible) (2008-2013) Forum - {Engine: S65 - Max Hp: 414 hp (420 hp Euro) at 8,300 rpm / 295 lb/ft at 3,900 rpm} at BMW M3 (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)