Problems with brake discs I recently bought a new bike. It is a Scott bike with disc brakes. The bike went in for it's service and now it has problems braking. As soon as I pull the brake leavers the front brakes makes a loud squeaking noise. The front brake disc is a blueish color from trying to brake. 

The back brake works perfectly. I took it back to the people who serviced it, and they were unable to solve the problem. Do you know what the problem could bee and how to correct it?
It sounds like your brake pads are contaminated with detergent or petroleum (oil) products. If so, you need to replace them.  

This is a common problem, which can be solved by washing the brake rotors with IPA, and replacing your brake pads.  It sometimes happens that a pad will get contaminated by chain lube or other common bike lubricants during the washing process of a bike service, and should be no big deal to fix.

As this is something that any shop worth 2 cents should know, they are either incompetent, or dishonest with you.