Grab lever at end of pad and push toward center of caliper body, pulling pad outward and away from caliper.Loosen each pad adjustment knob an equal amount.Mount bike in repair stand and remove the wheel.The procedure for Avid® mechanical caliper pad removal and replacement is as follows: Brake pads should be removed and replaced if the pad thickness, including the metal holder, is less than 3mm.Īvid® mechanical brake pads should be removed and replaced if the pad thickness, including the metal holder, is less than 3mm. Turn the both the fixed pad adjusting knob and the moving pad adjusting knob the same number of clicks to maintain the 2:1 ratio of pad to rotor spacing. As you ride, both pads will wear thinner at the same rate. Caliper arm may bottom out on caliper body and prevent the pads from pressing on rotor.Īs pads wear, use pad-adjusting knobs to move pads closer to rotor. Do not use the brake lever adjusting barrel or cable pinch bolt to account for pad wear. Set cable tension at the adjusting barrel so actuating arm is fully opened or returned. The caliper-actuating arm is designed to operate from a fully open position. For example, if a looser modulation is desired, turn the inner pad-adjusting knob counter-clockwise 4 clicks and the outer pad adjusting knob counterclockwise only 2 clicks. To maintain the 2:1 ratio, turn the fixed pad-adjusting knob twice as many clicks as the moving pad-adjusting knob. Adjust lever modulation setting by moving pads inward or outward from rotor by using both pad-adjusting knobs. Inner pad (fixed pad) to rotor gap should appear larger than the outer pad to rotor gap. Loosen inner padadjusting knob approximately 1/2 turn counter-clockwise. Loosen outer pad adjusting knob approximately 1/4 turn counter-clockwise.
Do not allow caliper arm to move upward when drawing slack from brake. Draw slack from the brake wire and secure pinch bolt.Alternate turns to tighten one bolt and then the other until both are fully secure. NOTE: Fine tuning of pad alignment is still necessary. This helps aligns caliper body and pads to rotor face. Turn the inner pad-adjusting knob clockwise until inner pad fully secures and locks rotor.Turn the outer pad-adjusting knob approximately 1/2 turn clockwise.Check that both pad adjusting knob dials are turned fully counter-clockwise to move pads fully away from rotor.Slacken cable with adjusting barrel or loosen brake wire pinch bolt if it is secured.Loosen caliper-mounting bolts so the caliper is loose on bracket or post mounts.If the caliper is attached to an adapter bracket, check that the bracket is fully secured to the frame or fork.The procedure for Avid® mechanical caliper pad alignment is as follows (note: for calilpers with a pad adjustment screw for inner and outer pads): This system allows easy alignment of the brake caliper to the rotor. This fixing system is similar to many brake pads on linear pull caliper rim brakes. Avid® disc caliper brakes use a ball-and-socket system for the caliper mounting bolts. Pad adjusting knob moves pad position relative to rotor. The Avid® mechanical disc brake for MTB bikes uses a brake lever designed for linear pull brakes. Prepare housing and wires as with rim caliper brakes. The brake housing and brake wire are the same as with rim caliper brakes. The lever should be set for a comfortable reach and secured to the bar.
With this design, the rotor will flex to push against the fixed pad when the brake is used.įlat handlebar brake levers used with mechanical disc calipers are compatible with the linear pull caliper rim brakes. However, alternative designs have one pad being fixed, with only one pad moving to contact the rotor. Depending upon the design of the caliper, both pads may move to contact the rotor.
Mechanical disc calipers use two brake pads, one on each side of the rotor. Mechanical disc brake systems use calipers that are cable actuated, similar to rim caliper brakes, with an inner brake wire and housing pulled by a brake lever. Allow rotor and caliper to cool before touching or servicing. The system can generate significant heat from slowing the wheel and bike. Disc brakes can be effective in wet weather where mud, dirt and water are a concern in braking. Disc caliper brakes slow the bike by converting the speed and energy of the bicycle into heat. The brake pads are housed in the caliper and are forced into the rotor. Disc brake systems use a caliper mounted near the dropouts of the frame or fork ends, and a rotor (disc) mounted to the hub.