You may have fielded a few complaints from customers regarding their disc brakes needing adjustments. Your knowledge of the situation will resolve the issue.
A disc brake caliper and rotor stay in one place, which is determined when the QR lever is closed. We then adjust the brake, and it works great. That brake to rotor relationship is changed when anyone opens and re-closes the QR lever. Most dropouts have a layer of paint on them, and may be made of aluminum or magnesium. The QR and ends of the axle are made of tougher materials, often tool-quality steel. When the axle is released and re-closed it bites down on a new place, or reengages the initial point with hundreds of pounds of clamping force. Either way, some paint or surface metal gets removed. When a bike is new, or the rider is new to the sport, that tension varies widely. Your rotor is usually centered in the caliper with almost one-half millimeter of clearance on each side, which varies widely in the first ten to twenty times the wheel is mounted in the fork.
THIS IS WHY YOUR BRAKE NEEDS ADJUSTMENT!
Often a small adjustment to the QR tension may resolve the issue. If paint on the caliper side dropout has been removed, you may actually need a minor adjustment.
Let's define one other aspect; noise vs drag.
You're listening to a disc rotor spin through a caliper, it might make a small sound. Like a metallic whisper once per rotation. This is very common on a brand new bike. As a new pad and rotor are used together, their surface irregularities from manufacturing wear away and they work much better. A little sound may not require an adjustment.
When you spin the rotor through and it slows the spinning wheel, you need to adjust that. It may be as easy as recentering the caliper, or all the way up to rebuilding the lever/caliper and replacing the rotor and pads. We must repair things to be safe and quiet; please call your trainer with any questions.
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2 comments:
Shall i change my bicycle V-Brake to Disc Brake? (My bike SUPPORTS Disc Brake)
I don't really ride fast, but i would like a more powerful braking power and also feel that my bike will look nicer with disc.
I was thinking to have mechanical brake, but some say disc brake was NOT good as v-brake.
Like noisy, not as powerful after some time, require a more finger effort than v-brake.
Is that TRUE?
Please specfiy other Cons of disc brake when compared to v-brake.
(Other than weight and cost.)
The best way for you to get answers to questions like this are to just visit any of our stores. Disc brakes offer some strong benefits, but aren't for everyone. We'll look forward to seeing you at any of our stores!
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