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Figure 1: Rotor |
Some rim brake systems also include a rotor, which allows the rear brake cable to bypass the headset such that the handlebars can be rotated a full 360 degrees. This capability is provided by a rotor (Figure 1) mounted to the headset. Since the rotor is a connection between the brake lever and the brake, its function is part of the brake operation. Proper rotor adjustment is critical to proper brake function.
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Figure 1: Rotor |
Once a month inspect the rotor for proper function. Watch the bearing unit as you rotate the handlebars 360 degrees. It should not move up or down, or tilt. When the brake lever is applied, the rotor should apply the brake firmly while the bearing unit remains parallel to the upper and lower cable stops. If the bearing unit tilts either when the brakes are applied, or when the handlebars are rotated, the rotor needs adjustment.
1. Ensure that both lower barrel adjusters are flush with (do not show above) the lower cable stop, and the bearing unit is resting on the lower cable stop.
The rear brake adjustment must be made with the bearing unit in this position. The bearing unit should be parallel to the upper and lower cable stops.
2. If it is tilted, there is slack in one of the cables. Pull each cable end, one at a time to see which cable has slack at the bearing unit.
3. Remove the slack through the barrel adjuster.
4. When even pull is achieved, tighten all barrel adjuster locknuts.
The rotor does not require lubrication.
