If your disc brakes make a noise during braking, we recommend the following measures to eliminate the various causes.
CHECK THE INSTALLATION:
Check if the wheels, hubs and axles are mounted correctly:
Make sure, that the wheels are mounted correctly, and that the hubs and axles are mounted without any free play. Also check the spokes for the correct tension.
Has the brake caliper been mounted correctly?
Make sure that the brake caliper is sitting flat and tilt-free on its mounting and that the adapter is correctly mounted.
Align the brake caliper height
When installed correctly, the brake pad should adequately cover the friction ring of the brake disc – it shouldn’t be located above the struts of the brake disc. Use washers if necessary (see Manual).
Align the brake caliper with the brake disc:
Make sure that the brake caliper is correctly aligned with the brake disc. The brake disc must run centrally/parallel in the brake caliper gap – it must not grind on the brake pads.
Check the attachment of the brake disc:
Check the Centerlock or the 6-hole mounting of the brake disc. For 6-hole brake discs, start by rotating the retaining screws only 2 or 3 turns – then turn the brake disc clockwise to center it and prevent movement during the braking process. Then tighten the screws crosswise to a maximum torque of 4 Nm.
Check screws and bolts for the correct torque:
Make sure, that all surrounding screws are torqued to the correct torque setting provided by the respective manufacturer.
Check the rotors for straightness:
Make sure, that the rotors are running straight, without any side to side play.
CHECK MATCHING FRICTION SURFACES FOR WEAR:
Check the thickness of the brake disc and the brake pad. The disc must not be less than 1.8 mm thick. Also check the thickness of the brake pads. The combined thickness of pad and the carrier plate must not be less than 2.5 mm. You can use the MAGURA transport device to test this.
CHECK MATCHING FRICTION SURFACES FOR DIRT:
The coefficient of friction is subject to changes caused by dirt on the brake disc or brake pad. The changed friction value can lead to vibrations, resulting in noise. Clean the brake disc thoroughly with methylated spirits, hot water, a soap solution or brake cleaner. When lubricating the chain or other bike parts, please make sure that the brake disc does not come into contact with oils or greases.
CHECK MATCHING FRICTION SURFACES FOR GLAZING:
Glazing of the brake linings leads to a harder surface, which changes the braking performance and the coefficient of friction. This can lead to vibrations and noise. Glazing has occurred when the brake pad has a smooth and shimmering surface that cannot be removed by grinding. Please replace glazed pads and ensure that the brakes are correctly run in.
CHECK THE BITE POINT AND THE SYSTEM FOR LEAKS:
Check the filling level of the system and look for leaks. Bleeding the brake often helps to solve noise problems.
We strongly recommend that you read the enclosed manual/operating instructions before using MAGURA products. Always observe and follow all instructions for assembly, operation and maintenance in this manual and the operating instructions of other manufacturers whose products are used on your bicycle – and please don’t overestimate the products’ abilities. Have assembly and maintenance work carried out in a specialist bicycle workshop or in an authorized MAGURA Service Centre, where a professional job is guaranteed.