Unfortunately, a squeaking part on the bike cannot always be identified directly. Whether saddle, drivetrain or stem: the source can be anywhere. From component to component, you work your way closer and closer to the squeaking part until finally only the brakes come into question. Here we show you how to check them for noises, what the causes could be and how to rectify the "defect".
Noises on the bike: Origin disc brake
Disc brakes are a blessing, especially for road bikes, but they bring new problems with them: certain models can easily generate noise. When stationary, you can only check whether the disc is running smoothly.
>> An overview of the search for noise sources can be found here: Noise on your bike: how it occurs & how to fix it
Squeaking brake pads
The most common cause of disc squeal is dirty pads or water on the brake disc; this usually also reduces the braking force. If water is the cause, the noise usually disappears after heavy braking and the braking force returns to normal. However, oily pads or pads contaminated with other chemicals can usually no longer be saved - you must then fit new pads and be sure to clean the disc with brake cleaner.
Noises on the bike: Brake disc trigger
Shimano's IceTech discs in particular deform easily when heat or force is applied, resulting in a metallic "zing" with every wheel rotation. If the noise only occurs after heavy braking and disappears again after a short time, there is no need for action. If it does not go away, first readjust the brake. Clean and mobilise the pistons so that they reset properly. If this is not enough, you can try to straighten a bent brake disc with a suitable tool.
Checking the screw connections
Another possible cause could be the screw connections of brake discs and adapters: If they are not properly tightened, vibrations occur. Check all bolts for the correct torque, including those of the disc and the adapter on the fork. In addition, the surfaces of the brake and adapter should lie flat on the attachment points on the fork - sometimes paint residue or inaccurate manufacturing can cause the brake body to tilt and the pads to squeak.
Other causes of noise on the bike
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Jens Klötzer
Editor
