Why does your car sometimes move forward after taking your foot off the brake and sometimes not?
In: Engineering
There’s another factor here, if you were doing this on flat ground consistantly and with an automatic transmission in drive, you should roll forward every time. If you’re in neutral or park, then no power will go to the wheels.
What might be happening is you noticed you won’t roll forward on a slight incline. There will be a certain slope where the slow rolling force will be matched by gravity, or if you’re in a more modern or luxury car, there might be an anti-rollback feature that’s kicking in. On my car there’s a function that keeps the break applied when you lift your foot off the brake pedal until you press the gas, but I have to enable it.
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