Buick 1993 Roadmaster Owner's Manual page 83

Limited-Slip Rear Axle
If you have this feature, your rear axle can give you
additional traction on
snow,,
mud, ice, sand or gravel. It
works like a standard axle most of the. time; but when
one of the rear wheels has no traction and the other
does, the limited-slip feature will allow the wheel with
traction to move the vehicle.
Parking Brake
To set the parking
brake:
Hold the regulaT brake
pedal down- with y,our
rightfoot. Push down the
1:
parkng. brake pedal with
1 ; .
-your
lefi-foot.. rf the
1 : . 'ignition is on, the brake
i~
,system warning light will
come on.