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      05-11-2015, 01:30 AM   #1
bacampbe
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Brake Pedal vs Auto Stop/Start

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I notice some differences in brake pedal behavior between my M235i vert and my wife's 328i:

When the auto start/stop kills the engine, I have to release the brake all the way to restart it. On the 328i, I just have to reduce pressure a hair. On the m235i, this means that the engine is usually not yet running when I first apply throttle.

Also, when creeping forward while riding the brake (e.g. while easing slowly into a parking place), the engine will sometimes stop while the car is still in motion. When this happens, there's a noticeable lurch when the thrust cuts out. This never happens on the 3er.

So, I wonder if there's a brake pedal sensor that is calibrated differently on the M235i? If this exists, is it adjustable?
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      05-11-2015, 02:11 AM   #2
moldcad
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I don't know an answer to the second part of your question, but from your description it's your wife's 328i whose Start/Stop work properly with the gas pedal. My M235i works exactly the same, as did my previous BMW with the Start/Stop system (F10).
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      05-11-2015, 06:02 AM   #3
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Quote:
Originally Posted by bacampbe View Post
I notice some differences in brake pedal behavior between my M235i vert and my wife's 328i:

When the auto start/stop kills the engine, I have to release the brake all the way to restart it. On the 328i, I just have to reduce pressure a hair. On the m235i, this means that the engine is usually not yet running when I first apply throttle.

Also, when creeping forward while riding the brake (e.g. while easing slowly into a parking place), the engine will sometimes stop while the car is still in motion. When this happens, there's a noticeable lurch when the thrust cuts out. This never happens on the 3er.

So, I wonder if there's a brake pedal sensor that is calibrated differently on the M235i? If this exists, is it adjustable?
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      05-11-2015, 10:25 AM   #4
casper83
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My M235i acts similar to your wife's car. I start to release the brake pedal and the car restarts.
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      05-11-2015, 10:30 AM   #5
bacampbe
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I don't know if this is related, since it involves pressing rather than releasing the brake, but I also notice that I have to tap harder than I expect to deactivate the cruise control. In my wife's car, just a tiny tap will do it, but in mine I have to give it a conscious effort.

(On the flip side, I like the brake feel much better in the M235i. The 328i feels way too soft for my tastes. Hopefully the two are not related.)
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      05-11-2015, 02:47 PM   #6
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If I change the pressure on my break pedal my car starts back up....
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      05-11-2015, 02:55 PM   #7
bacampbe
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Sounds like mine is miscalibrated. Anyone know how the start/stop system senses brake pedal position, and if there's something that can be adjusted?
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      05-11-2015, 04:39 PM   #8
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I would assume it keys off of the same circuit that enables the car brake lights.

Easy enough to check with an assistant watching the brake lights while the driver eases up on the brake pedal...
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      05-11-2015, 07:15 PM   #9
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Quote:
Originally Posted by OpenAir View Post
If I change the pressure on my break pedal my car starts back up....
Ditto.

I also noticed a subtle thing:

I'm in Eco or Comfort noodling around in traffic.
I pull up to a stop light and come to a complete stop (engine shuts off)
I gently lift brake pressure or move a foot or two (engine restarts).
If I press down on the brake pedal again (full stop) the engine stays on and will not turn off again.

So in short, if shut down occurs and then restarts again quickly, it will not shut down again at the same stop.

It sort of makes sense...as if you're creeping into an intersection about to turn left. You don't want to have it turn off on you.
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