Braking Performance

Discussion in 'Technical Help' started by CarloL, Apr 20, 2023.

  1. M900 1997
    New brake fluid
    Calipers cleaned, pistons working as expected
    Brake pads , brembo road, 2 years old
    All good when put off the road 7 months ago
    The brake lever feels fine ,
    Grazed brake pad against concrete to remove any containments

    Issue is braking performance, does not bite the disc and bring her to a halt prior winter storage, 7 months ago , after 30mins riding (city traffic) , I get brake fade
    Pull the lever , thinking stop stop stop , strange squeak after a few uses

    Video https://youtube.com/shorts/KLFxeuThiQU?feature=share

    Any ideas?
     
  2. What pads ? Andy
     
  3. Brembo 07BB15SA Sintered Street

    Had no issues last 2 years with them
     
  4. I'd suggest using sandpaper on the pads and discs rather than concrete, then bed them in again.

    Also make sure there's no grease or oil contamination.
     
  5. Fade is often due to heat.

    How much brake fluid is in the res? I’ve seen it where it’s got a bit too much on the res and this causes the brakes to bind as everything expands
     
  6. Good call , took a little bit out need to test

    To rule out calipers , I cleaned, caliper pistons on both calipers have zero corrosion, and do move in/ out

    I took the calipers off and left the pads in , pushed pistons in and tested all are working , pistons move in/ out ; no idea If this is sufficient to indicate calipers are all good or if it would highlight a partially seized piston, it is a 97 bike

    Brake pads cleaned with brake cleaner , I don't think they are the issue but I don't know if it is of concern, the marking on the rear of one pad from the piston



    So far , tested

    Discs, pads all cleaned with brake cleaner, pistons cleaned ,suspension forks serviced new oil, bushes -- issue still there

    Brake fluid was a tiny bit high but need to test , low probability it is the issue

    Any other tests I can do?
     
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