Tire Pressure Warning System; Brake Assist System - Lexus 2004 LS430 Owner's Manual

Brake assist system

If you slam the brakes on such as in an emergency or
apply the brakes more firmly than usual such as when
descending the hill with the designated number of
occupants in the vehicle, the brake assist system
provides more powerful braking.
If you slam the brakes on or apply the brakes more firmly, more
powerful braking will be applied. At this time, you may hear a
sound in the engine compartment and feel the vibrations of the
brake pedal. This does not indicate a malfunction.
The brake assist system becomes operative after the vehicle
has accelerated to a speed in excess of approximately 10 km/h
(6 mph). It stops operating when the vehicle decelerates to a
speed below approximately 5 km/h (3 mph).
For an explanation of this system's warning light, see "ABS"
warning light on page 86 or 366.
STARTING AND DRIVING
TIRE PRESSURE WARNING
SYSTEM
The tire pressure warning system is designed to provide
warning using a message in the multi-information
display, master warning light and warning tone when tire
inflation pressure is critically low while driving. This
message appears to inform you that such low tire
pressure may hamper driving.
As this system is not designed to operate when the vehicle is
stopped, check the tire inflation pressure regularly.
recommended cold tire inflation pressure, tire size and the
vehicle capacity weight are on the tire and loading information
label. (For instructions, see "Checking tire inflation pressure"
on page 478.)
Installed tires should be of the specified size. They should be
of the same size and construction. If tires other than the
specified size are used, or if tires of different sizes or
constructions are mixed, the tire pressure warning system will
not function properly.
The
367