They are not needed for normal driving. They are on some aftermarket rotors to cool them faster, but they are hard on pads and most get them just for looks. Many pros drill the holes themselves-it's cheaper.
Disk brake rotor is warped
Lift the car on a jack, remove the wheel, the brake shoe and disk. Next put on the new brake disc, put the brake shoe where it belongs, put the wheel back on and lower the car to the ground.
When the brakes are applied, the car's kinetic energy is converted to heat by friction between the brake pad and the brake disk.
right first you have to have a piece of paper then you draw it:)
you could have worped disk brakes. or your brake pads are not level with your disk brake
Brake pads are part of the cars disk brakes. There are four different brake pads they are semi-metallic brake pads, organic brake pads, low-metallic NAO brake pads and ceramic brake pads.
Could be a disc brake rotor, pulley.
Generally speaking for cars that have "disk brakes", friction slows the car. When the driver presses down on the brake pedal the brake calipers squeeze the brake pads against the brake rotor inside each car wheel causing the car to slow down by friction.
What you're describing COULD be what is called "disk brake chatter". The problem is caused by heat, which eventually will warp the rotors. If the rotor is warped the disk brake pads grab with different force as the warped rotor changes angle toward the brake pads. If the problem IS disk brake chatter, the only options are to have the rotors turned or replace them.
Remove the brake caliper and hang it out of the way, then thread 2 8 mm bolts into the holes provided on the disk. Screw them in and the brake rotor will come off.
I have had bikes with disk and regular brake pads. Disk brakes dont squeak like regular brake pads and stop you much shorter. This is why disk brakes are more expensive.
The braking system on a car depends on lots of friction between the brake pads and the brake disk.