geoffs

Ok, so I got my new (to me) C250 (2016) just a week ago and use the brake hold function, works great.

However, this morning I was stopped at lights and the engine autostop kicked in, so the engine stopped. I applied the brake HOLD function and all good. The junction was a bit mad, so I was sat there for a bit, then the engine restarted as the autostop timed out and the brakes released and the car started to move forward. Very disconcerting!!!

So at the next lights i did the same again, but this time pressed the deactivate on the autostop and the engine started up, but the brakes remained on!.

So the question is, what is supposed to happen?

I would have thought that the brakes should not release unless i want them too, not when the autostop times out?

What experience do you guys have of this???

Thanks.

ManiacGT

I've had this...

... I think I ever so slightly pressed the throttle pedal.

geoffs

I was sat with both feet on the floor, nowhere near the pedals!

Good job i am still getting used to the car and reacted quick to brake again!!

I am going to get my dealer to check it out for me.

RichardCranium3

Might be worth a trip to the dealer. I've sat with the engine off and hold active and the engine came back on and hold stayed active. One would think this is the way it's intended to operate - not release until you say so. I could be wrong...because German engineering.

geoffs

My thoughts exactly, i'll get try some more and get it checked at the dealer when i have opportunity, certainly be keeping a wary eye!

I'll report back once i have been to the dealer!

JBMCL

OK! So I'm not crazy!

This happened to me as well. I think it was a couple months into ownership and I didn't use the Brake Hold function much, if at all. One morning, I was at a light and waiting for it to turn green and saw something was stuck on my driver mirror. I put the car in "HOLD" and unbuckled my seat belt and reached for the debris. Suddenly the car disengaged the "HOLD" function and I jerked forward. I quickly slammed on the brakes and luckily I didn't rear-end the person in front. I was an inch or two from it since my front sensors were all red.

Scared the S**T out of me and now I'm always weary on using the "HOLD" function. When I do use it, it stays in place now and it hasn't jerked forward or disengaged the HOLD function ever since that time.

I don't rely on the "HOLD" function anymore and always make sure the car hasn't disengaged, even if I'm using it.

z28lt1

Never had the hold function not work. I will say though that auto-stop, stops (so the car starts) if you unbuckle the seat belt.

Wonder if these cases "hold" wasn't actually on and when autostart kicked on, the car moved forward. Once in a while I don't get hold on properly. If the car is auto-stopped, you won't feel that is isn't engaged (you have to be looking for the "hold" in the information center).