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Adjusting mechanical disc brakes
The brake pad nearest the bike's wheel (inner pad) should be as close as possible to the rotar without actually touching it. If it is too far from the rotar, applying the brakes will cause the rotar to bend. This problem occurs becuase only the brake pad farthest from the wheel (outer pad) moves. In order for the brakes to work, the outer pad pushes the rotar until it also touches the inner pad.
There are two ways of adjusting the inner pad. The first is to screw or unscrew the...??? until the pad is properly the adjusted.
The second is to slide the frame of the inner brake pad back and forth on the calliper. To do this, unscrew the two bolts that secure it, and mamually adjust its position. Remember to resecure the bolts when you have your desired position.
As the pads wear (they are made of a softer rubber and rherefore wear more quickly than other brake pads), you will need to readjust the position of the inner pad.
If you need to replace disc brake pads, you must find pads made by the manufacturer of the calliper. These are the only ones that will fit. This is also good to keep in mind when purchasing disc brakes. To remove the pads from the calliper, you should just need to slide them out. There should be a tabe that you can grab in order to facilitate this process.
Once the pads are properly adjusted, further adjustments are made identically to those use for V-brakes or Calliper brakes.