Is it engine or more like a physical braking sensation? if the latter my Q5 also does this and the X3 I test drove was the same, I think its the Hill Hold System switching over from the wheel brakes (for a temporary hold) to the handbrake (for a longer one). The system can use both depending on situation.
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Current 2016 F80 M3 Saloon, Alpine White & Silverstone Full Leather. Love it.
Past 2015 F13 M6 Coupe, San Marino Blue & Opal White Individual Leather. Gone but not forgotten.
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