Honda Prelude 1990 Online Reference Owner's Manual page 18

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Anti Lock Brake (Si with ALB)
ALB (Anti Lock Brakes) help to maintain the road holding and
tractability of your car during severe braking, and under slippery
road conditions. The ALB system prevents the wheels from locking
(thus reducing the chance of skidding) to ensure controllable
deceleration. When sudden braking might otherwise lock one or
more wheels, the ALB system temporarily reduces the braking
pressure to the wheel or wheels about to lock to ensure continued
braking efficiency.
When the ALB is regulating the braking pressure, the brake pedal
pulsates slightly to make the driver aware that the system is
compensating for critical braking conditions. The pulsating brake
pedal can be an indication of hazardous road condition, and to
remind you to take extra care.
Don't mix different diameter tires; it will confuse the ALB
computer which monitors the road speed of each wheel. For
example, if one or more tires are larger than the others, the
computer will think they are rolling more slowly (as if they are
about to lock up) and reduce brake pressure to those wheels.
On loose or uneven surfaces (gravel, ruts etc.) where all four
wheels loss traction intermittently, the ALB system may require
a longer stopping distance than an equivalent car with a
conventional braking system.
The ALB system cannot make up for extreme road conditions or
driver misjudgement, It is still the driver's responsibility to drive
at a suitable speed and provide a margin of safety for the road,
weather and traffic conditions at hand.
CAUTION:
Be careful not to damage the wiring or the speed sensors at the
back of each wheel when removing mud or snow from the wheel
housings.
NOTE:
You may hear a sound like a small motor running, coming from the
engine while driving or after the ALB is applied. This indicates the
ALB pump is in service and the system is working properly.

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