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Loud droning sound from back break

Discussion in 'Biker's Cafe' started by PsychoPigeon, Aug 14, 2019.

  1. PsychoPigeon

    Wise Guy

    Joined: Dec 20, 2008

    Posts: 1,318

    My Yamaha YBR has passed it's MOT and had a service recently but something that has come up since then which is a loud droning sound from the back break when slowing down when I'm 30mph and above. I'm not putting my foot down on it but at a certain point it will make the sound so I ease off and apply more front break to make up for it.

    It's not a high pitched squeaking sound, it almost sounds like a horn, it's a dull hollow type of sound. I was wondering if I was using the back brake the wrong way. Would this sound familiar to anyone here?
     
  2. MowyTone

    Mobster

    Joined: May 4, 2009

    Posts: 3,366

    Location: Southampton

    Going by Google image search your rear brake is a drum brake. All of the workings of this are internal to that drum so there isnt much that can be looked at without taking the drum apart. Has it had new brake pads in the service?

    Sounds like something isnt aligned properly. Also look at the position of the rear wheel to make sure it is square on to the bike. Also make sure that the wheel isnt leaning left or right from vertical (could suggest wheel bearings collapsed)
     
  3. Malt_Vinegar

    Don

    Joined: Oct 20, 2002

    Posts: 15,174

    Location: In a house

    I remember reading about YBR drum brakes making noise when they are full of brake dust and contaminated when I was looking at 125s a while ago.
    I would strip it down, clean it up with brake cleaner and check it is wearing evenly/as expected :)
     
  4. Smok3y

    Wise Guy

    Joined: Dec 6, 2002

    Posts: 1,295

    Location: Stoke on Trent

    Was going to post probably brake dust build up.