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05-22-2008, 03:38 PM | #1 |
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Setting the E-brake after a track session
OK, everybody knows you're not supposed to set the hand-brake after a track session or autocross run or even really 'spirited' driving but I've been thinking about this lately. If the 135 hand-brake is the same as the E36 M3, it doesn't clamp the pads onto the rotor, it has an actual drum brake assembly (with two brakes shoes) inside the rear rotor hat.
Does anybody know if it's the same on the 135? If so, what's the downside of setting the brake after a run? All it does is press the brake shoes against the inside of the rotor hat, nowhere near the hot rotor surface, so it shouldn't cause any warpage. I sure as heck don't plan to test this theory and will still never set my hand-brake after a track session but the mechanical engineer in me is beginning to wonder if that concept applies to this type of hand-brake set-up?
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Dan in Houston / CCA # 93849 |
05-22-2008, 10:37 PM | #4 |
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I still wouldn't set the park brake, you could warp the drum.
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05-23-2008, 01:07 AM | #7 | |
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05-23-2008, 01:09 AM | #8 |
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05-23-2008, 02:27 AM | #11 | |
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That's why you take a cooling lap, no? I could understand if driving local twisties, but on a track, you take a cool-down lap..or 2. Wheel chocks work nicely also. |
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05-23-2008, 08:17 AM | #12 | |
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Just an FYI these cars have an after-run oil pump to prevent that. (I'd probably still do a cool down, but I don't think cooking the oil in the turbos is going to be an issue for us.) |
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05-23-2008, 09:34 AM | #13 |
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I'm not positive but I believe it just runs the coolant not the oil after you shut the car off.
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05-23-2008, 10:39 AM | #14 |
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05-23-2008, 10:41 AM | #15 |
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05-23-2008, 02:31 PM | #16 | |
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I'm pretty sure it's the other way around, but I could be wrong. I'll have to dig into it a little. Edit: I dug into it and you're right. It's the coolant pump that runs afterwards for cooldown. Here's what the N54 tech documents say about it: After-running of electric coolant pump = improved heat dissipation from engine switch off reduced oil “coking” during heat soak.point. Allows protection of turbochargers by Sorry about the thread jack! |
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