Pumping brakes in a car? Help!?

if you are talking about what you used to do with older cars without ABS breaking systems you would 'pump the brakes" when you were sliding in order to stop. the ABS breaking system does this for you. so if this is what you are refering to, then pumping them would mean pressing on and off the brake pedal.
 
If your car has ABS you don't pump them, just keep firm even pressure and let the computer do it. If your car doesn't have abs you apply the brakes ans release half of the pressure then reapply the brakes and continue until your stopped.
 
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