View Single Post
      11-15-2012, 05:23 PM   #13
HighlandPete
Lieutenant General
6659
Rep
15,858
Posts

Drives: BMW F11 535i Touring
Join Date: Mar 2007
Location: Scotland, Highland Region

iTrader: (0)

Quote:
Originally Posted by Isow View Post
Thanks for the reply.
What's a pawl ?

Why does the car roll when put into P on a slope ?
Pin, pawl, plunger... imagine a pin moving into a hole or slot in a shaft, preventing the shaft turning, that is the function of the 'park' mechanism.

Once you engage that lock mechanism, the driveshaft out of the gearbox doesn't rotate, but the weight on the shaft from the wheels trying to rotate on a slope, is 'wound up' by the suspension and any tolerances in the mechanical components between that shaft lock and the footprint of the tyres. The rear of the car will likely rise or fall due to that action as well. So the car doesn't exactly roll, but feels a bit like it.

HighlandPete
Appreciate 0