HI, 2013 Mini All4S-m with 64k miles on it. Just got it 4 weeks ago.
Lately when rolling down the very long driveway the Brake pedal will buck/Klunk. What would cause a Klunk vibration to come up the Brake Pedal even though I'm not using the brakes ( just have my foot touching the pedal ready to use). Is this an engine mount or transmission mount thing? Its a sound and Klunk that is coming from underneath the car. Only on a slope (like leaving a driveway or going back up). Has done it on other "slopes" other than that driveway.

Thanks!

Could be the hill assist trying to do its job....or some sort of malfunction of it.

But if you are applying the least bit of pressure to the pedal I am betting the former.

Will pay attention and test further.
thanks

It feels like an automatic transmission when it has a hard time shifting, then Klunk. I have a stick. It is definitely something happening on front end. This time my foot was not on the brake pedal. Also the engine has been stumbling here and there like maybe a misfire.
Has original HPFP.
Serpentine belt was just changed out.
Spark plugs were cleaned at 42k miles. Just ordered new spark plugs and coil packs.
Got a Veerpeak and will be hooking it up tomorrow.
Driving style: Spirited

Yup its still doing it. On a couple of different steep driveways. Clutch in, foot slightly depressing brake. Klunk, brake pedal jumps.