Fitting Avid cable disc brakes

From TrialsWiki

Firstly you need to attach the rotor of the disc onto the hub, this is done by the 6 bolts supplied with the brake (bolts should be done up no tighter then hand tight) then place the wheel into fork/frame tightly.

Apply brake lever to handlebar and tighten hand tight with allen key.

You need to fix and align the caliper:

If your caliper is attached to a bracket, check that the bracket is fully secured to the frame or fork.

Loosen the caliper-mounting bolts so the caliper is loose on the bracket. Caliper adjustment is made at the caliper to bracket interface, not at the bracket to frame/fork interface.

Loosen brake wire pinch bolt if it is secured, then check that both pad adjusting dials are turned fully counter-clockwise to move pads fully away from rotor.

Turn the inner pad adjusting knob clockwise approximately 1 turn. Then turn the outer pad adjusting dial clockwise until the pad fully secures rotor. This aligns pads and caliper body to rotor.

Snug each caliper mounting bolt. Then alternatively tighten first one bolt, and then the other until both are fully secure.Draw slack from the brake wire and secure pinch bolt. Do not allow caliper arm to move upward when drawing slack from brake.

Set the pad clearance. The Inner pad (fixed pad) should have twice the gap to the rotor as the outer pad (moving pad). Loosen fixed (inner) pad by adjusting the dial 2-3 clicks counter-clockwise. Then Loosen the moving pad by adjusting the dial 4-6 clicks counter-clockwise.

Finally, squeeze the brake lever to test the caliper brake. Adjust the lever modulation setting by moving the pads inward or outward from the rotor by using both pad adjusting knobs.

To maintain the 2:1 ratio, turn the fixed pad by adjusting the dial twice as many clicks as the moving pad adjusting dial.