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Re: jack slipped

I've had cars in gear roll forward or backward with a little gravity at
work.  I've also had parking brakes that work better on one wheel than on
the other.  Chocks stop movement in either direction, generally.  

Kneale Brownson

At 06:59 PM 12/19/99 -0700, Andrew Buc wrote:
>On Sun, 19 Dec 1999 19:36:37 -0500, Kneale Brownson wrote:
>>Absolutely essential during use of the Audi-style jack is that you block
>>the wheels on the other side of the car.
>It seems counterintuitive that this would help if the parking brake was
>already on and the transmission was in gear (stick) or park (slushbox).
>Any theory why it works this way?