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    What the heck is going on with my brakes?

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    15 Comments

    1. InSearchOfThe9 on

      For context:

      * The knocking sound goes away after washing the rotors/pads (brake cleaner and just a power wash), but comes back within a day or two without fail

      * The brakes work fine, but the area on the rotor causing the knock can be so severe I feel the jolt in my bars

      * The brakes are Magura MT5s with the Storm rotors

    2. Switchen on

      Contaminated, likely. Remove the wheel. Clean the rotor with isopropyl alcohol and a clean rag. Replace the pads before reinstalling the wheel. Bed in the brakes.

    3. pet0r1 on

      Have you checked pad alignment, pad wear, sticky pistons, chipped pad?
      Sounds like one edge of the pad is catching the relief cutouts of the rotor.

    4. pirate_leprechaun on

      Not much to disk brakes, take the pads out clean everything and reassemble.

    7. Tytonic7_ on

      I had this problem on a marlin 6 and I tried everything. I believe it’s the pads catching on the edges of the rotor, and it never went away. I’ve found other people with the same problem too. Getting different rotors helped for me.

    8. Skaivakeeh on

      Is the rotor straight?
      Is the rotor thickness in specs?
      Maybe rotor is contaminated with some build up staff? Try to clean it with a skotch-brite
      Is your rotor overheated in the past? That can cause increased surface hardness and brake pad basically skips on it.
      If you overheated or contaminated your brake pad take out and the sand it with an emery cloth (I would say 80-120 grit, couple of times back and fourth, till it gets an even surface).
      Hope you will find the cause.✌🏻

    9. No_Concert698 on

      Maybe the brake pads glazed. If so, sanding them down a bit and cleaning them with isopropyl helps a lot

    10. Odd-Journalist1378 on

      They are glazed over, probably needed to bedded bit more before hard use. If you take them out, you can sand them down with a fine sandpaper. Then give them a proper bedding.

      Also, if you ride your brakes a lot, metal pads have a tendency to glaze. You can try ceramic, they are less likely to glaze but don’t have the stopping power.

    11. -Davezilla- on

      My buddy had this same issue, he had to mess with the alignment a ton and it finally stopped.

    12. brettzkyyy on

      What kind of rotors / pad combo are you running? Other than the pads being possibly contaminated like the other comments point out, another time I’ve seen this issue before is when Shimano resin only rotors are run with metallic pads

    13. A6RA4 on

      Metallic pads do this kind of sound especially when cold, a disc and pads clean to be safe…
      Have MT7s with the floating rotors… they make a hell of all kind of noises, but they brake so good

    14. SoapyBrow on

      might have a kink i your rotar maybe, i’ve got on and i can hear it scrape a bit at the same spot, it doesn’t happen all the time just most of the time 😆

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