• Do they all do that?

    No. The MT4s have a different interface at the master that doesn't allow lever swaps.

    That said, I can't remember the MT4s on cargo bikes / GSDs rattling. Maybe you had a shonky pair?

  • Actually, just checked, they were MT6s Yeah they were a 2nd hand pair. Changed the hoses and bled them fine and they worked really well, just the lever rattle was annoying. Interesting as need a new pair for a build and cant afford Hope and dont want Shimano.

    Martas bitd as well which were superb (once bled correctly)

  • It's possible the leavers were changed on the pair you had and it wasn't done right. IIRC the hinge pin is an interference fit.

    Also noticed that if you crash hard, i.e. OTB or something, the levers can get driven backwards and the sacrificial tab on the lever itself (that prevent rattling!) gets snapped off.

    So maybe your brakes were involved in a big off at some point.

    FWIW MTs are superb brakes.

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