Dec 28, You must login to Pinkbike. Don't have an account? Sign up. Avid's BB7 cable disc brake is an economical stopper that is a great low cost alternative to more expensive hydraulic brakes, but like any other component, it needs to be setup correctly to get the best results.
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Disc brake systems use a caliper mounted near the dropouts of the frame or fork ends, and a rotor disc mounted to the hub. The brake pads are housed in the caliper and are forced into the rotor. Disc caliper brakes slow the bike by converting the speed and energy of the bicycle into heat.
Disc brakes can be effective in wet weather where mud, dirt and water are a concern in braking. The system can generate significant heat from slowing the wheel and bike.
Allow rotor and caliper to cool before touching or servicing. 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.
Mechanical disc calipers use two brake pads, one on each side of the rotor. Depending upon the design of the caliper, both pads may move to contact the rotor. However, alternative designs have one pad being fixed, with only one pad moving to contact the rotor. With this design, the rotor will flex to push against the fixed pad when the brake is used. Flat handlebar brake levers used with mechanical disc calipers are compatible with the linear pull caliper rim brakes.
The lever should be set for a comfortable reach and secured to the bar. The brake housing and brake wire are the same as with rim caliper brakes. Prepare housing and wires as with rim caliper brakes. It can be difficult to measure and achieve this ratio, but the brake will still perform even if the ratio does not achieve this exact proportion.
The outer pad moves toward the rotor when the caliper-actuating arm is pulled by the brake wire. The inner pad can be adjusted toward or away from the rotor with a pad-adjusting knob, but it is fixed during braking.
The moving pad flexes the rotor toward the fixed pad when the brake is operated. The moving outer pad also uses an adjusting knob to position the pad relative to the rotor.
The dial uses an indent system, with 16 per revolution. One complete revolution moves the pad approximately 1mm. Pad adjusting knob moves pad position relative to rotor. This fixing system is similar to many brake pads on linear pull caliper rim brakes.
This system allows easy alignment of the brake caliper to the rotor. The caliper-actuating arm is designed to operate from a fully open position. Set cable tension at the adjusting barrel so actuating arm is fully opened or returned. Do not use the brake lever adjusting barrel or cable pinch bolt to account for pad wear. Caliper arm may bottom out on caliper body and prevent the pads from pressing on rotor.
As pads wear, use pad-adjusting knobs to move pads closer to rotor. As you ride, both pads will wear thinner at the same rate. Turn the both the fixed pad adjusting knob and the moving pad adjusting knob the same number of clicks to maintain the ratio of pad to rotor spacing. Brake pads should be removed and replaced if the pad thickness, including the metal holder, is less than 3mm.
Worldwide Distributors. Trade Resources. Loosen each pad adjustment knob an equal amount. Back To Top.
SRAM Avid BB7 Manuals
There are a couple of common issues with the BB7 that crop up in many of the forums, many of them due to not taking care with the setup of them. One of the most common complaints is of a spongy feel. This is most certainly down to the type of cable and routing being used. At the very least you absolutely MUST use compressionless cable housing, and make sure that you run it full length to the brakes themselves. Do not use sections of cable with interruptions with one exception which I will mention in a moment as you may do for rim brakes.
Tech Tuesday - Avid BB7 Cable Disk Brake Setup
Avid® Mechanical Disc Adjustment