Asked the mechanic: squeaky disc brakes and bolt grease

This is our art, our experts answer your mechanic Daniel Slusser's Cyclery bicycle maintenance problems here running a sixth edition.
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Q: My new XTR disc brake is really howling. They seem to be at the end of a long descent deterioration. This is really annoying. How do I solve it? From: Sam
Sounds like your brakes are trying to tell you something. Cold new brakes are usually either the program or pad / rotor contamination improper rest of the results. Either way, you will need a new pad. Whenever you have new pads, rotors or two, a specific process to follow breakthrough.
First of all, with rubbing alcohol and clean cloth to clean the rotor. Ensure that the new pad vegetable oils and waxes. This means that you should never touch the surface of the brake rotor or pads! Every time you brake for your oil, they need to be replaced. There are ways to reduce pollution, but they never followed the same time pad contamination, so there is no review of these methods.
After all installation, on level ground or slight downhill section of road has several controls to stop. These stations should be initiated 15 mph or less speed. But you do not want to completely stop, just slow about 2 miles per hour (walking speed), and repeat the process until the brake power and consistency improved. Be sure to separate each brake break, so you can be sure, one is no other compensation. Do not attempt the mountain, trying to do it all in one, in order to speed up the process. This will create you are trying to make them chatter on the rotor in order to avoid problems and glaze your pads.
One last thing, I like to do to help prevent noise problems is the chamfer grinding of brake friction materials leading and trailing edge. This will help with the smooth pad contacts the rotor, reducing noise.
Finally, the pad material selection as well as noise problems. Organic pads are often run quieter, but, more likely to be heat damaged. So, if you are a downhill cultivation, chronic brake dragger, or if you ride long, steep trails, and then sintered or metal pad is a better choice. They will be noisy under normal conditions, but what it is, not by a good mental health "of the deal.
In the worst case, you can not fix the noise, just think brakes, horn, to warn other trail users, you are led by them. Borrow and modify a line from the Harley riding community, "loud brakes save lives!"