Hello!

 

Yesterday I encountered an interesting thing with my start-stop function.

Usually the start stop works as follows: I brake the car down, supress the brake (automatic transmission) and the car starts when I supress the gas pedal next time.

Yesterday I discovered that suddenly my car now starts the engine when I depress the brake. 

Anybody else had something like that happening to his / her car?

 

Best regards.

Indrek.

Do you normally have autohold turned on? If you do, engine will start when you press accelerator pedal. If you turn it off, engine will start when you depress brake pedal. 

and with deactivated ~auto hold~ you can depress brake pedal softly and start engine without move forward.

Makes perfect sense.

Thanks guys!

think you will find that if you wobble the steering it will also start

Yesterday I discovered that suddenly my car now starts the engine when I depress the brake.

Anybody else had something like that happening to his / her car?

Best regards.

Indrek.

The reason behind this is that by pressing the brake pedal again with the engine stopped, you have depleted the vacuum assist servo! Next time you stop the car to get out, try repeatedly pressing the brake pedal with the ignition off and it should go hard/firm after a couple of presses. Without vacuum assist, braking your car would require a very strong set of legs pressing the brake pedal!

Then, to test it's working, apply light pressure on the firm brake pedal and restart the engine. The pedal will slowly move down further in its travel = the brake servo is working as designed!

There is a sensor to monitor the vacuum servo pressure which you will trigger if you press the brakes when the engine is off. If the car didn't restart to replenish it, you would have a few seconds of unassisted braking after pulling away which is not desirable.

Hope that comprehensively answers your question. It is a safety feature by design and operating correctly.

Edited 13 July, 20169 yr by blahde2

I think there may have been some confusion in this thread about the meaning of 'press' and 'depress' - native English speakers will know it means the same thing, but I think the OP meant 'release' instead of 'depress' [emoji106]

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