Ford Mustang Owner's Manual page 157

Braking with ABS brakes
On vehicles equipped with an antilock braking
system (ABS), a noise from the hydraulic pump
motor and pulsation in the pedal may be
observed during ABS braking events. Pedal
pulsation coupled with noise while braking
under panic conditions or on loose gravel, wet
or snowy roads is normal and indicates proper
functioning of the vehicle's antilock brake
system. If the vehicle has continuous vibration or
shudder while braking, felt mainly in the
steering wheel, the vehicle most likely needs
service.
On vehicles with anti-lock brakes, the wheels
will not lock and slide when you press down
hard on the brake pedal. The anti-lock brakes
automatically start releasing and reapplying the
front brakes independently and the rear brakes
together whenever your wheels start to lock. Do
not "pump" the brake pedal on vehicles
equipped with anti-lock brakes. When this
happens, you will feel the brake pedal pulse.
This "pulse" may be an unfamiliar feeling but it
is normal and indicates the ABS is working as
designed.
Do not drive with your foot resting on the brake
pedal; you will wear out the linings and increase
your vehicle's stopping distance. Brake rotor
damage may also eventually occur.
NOTE: If you are driving down a long or
steep hill, shift to a lower gear and do
not apply your brakes continuously. If
you apply your brakes continuously,
they may overheat and become less
effective.
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