why do brake pad and rotor always touch each other?
when u spin the wheel without a calliper it spins many revolutions but if u put the calliper back and spin it only goes 1 or half a revolution because pad and rotor are always touching.
Why cant engineering make somethiing to separate the pad and rotor for better fuel economy
- mark_pocLv 64 weeks ago
The pads and rotors are supposed to touch. This is so the rotors stay wiped clean from water, mud, etc., and so there isn't a little noise every time you step on the brake. The effect on gas mileage is very minimal.
- 異域秦後人Lv 74 weeks ago
BECAUSE IT IS THE LIMITATION FROM MECHANICAL DEVICE THAT RUNNING ON GASOLINE POWER CAR, ELECTRIC CAR CAN USE A BETTER WAY TO BRAKE THE CAR BY REVERSING THE ELECTRIC MOTOR POWER SOURCE AT THE SAME TIME WHILE BRAKING, RATHER THAN USING A SET BRAKE PADS.
- Robert JLv 74 weeks ago
If everything is working right - and once the pads are "bedded in" and any loose bits worn away - the pads should pull clear of the discs by a tiny amount.
The pads are retained by small pressed steel spring clips. They allow the pads to move and spring back again within a small range, but push through the caliper as the pads wear down.
There are many designs, varying from make to make and model to model. This is an example - you can see the spring clips on the "ears" on the pad ends.
If the pads are not clearing once bedded in, something is not fitted right, the pad clips are faulty or the piston(s) is/are sticking.
The piston(s) also give a similar elastic retraction effect as the seals either deform or slide, depending on the overall movement when the brakes are applied.
- Jim MoorLv 74 weeks ago
Like many engineering issues, it takes someone to ask these questions, then come up with a solution... could that be you?