Squeaky disc brakes are the result of vibration on the rotor / pad becoming audible. We have found the two main reasons are most commonly the rotor / pad getting wet and secondly the pads become ‘glazed’ or worn out.
In our experience once wet rotors have dried (approximately 100 metres riding) the squeak stops. If the pads are glazed the problem is more complex to resolve. Remove the pads and re-dress them using a coarse abrasive surface (don’t be gentle), this solves the problem in the majority of cases. If the problem is constantly recurring remove the pads and put a dab (only a dab) of copper-slip on the piston surface then replace the pads. Loctite 8065 and ROCOL anti-seize are both suitable products.
If the methods outlined above don’t stop the squeak try new pads if this does not eliminate the noise reset the callipers on the frame and rotor.
Squeaky disc brakes are the result of vibration on the rotor / pad becoming audible. We have found the two main reasons are most commonly the rotor / pad getting wet and secondly the pads become ‘glazed’ or worn out. 
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