Quantcast

Shimano Brakes - How stiff should the lever feel with a good bleed?

Discussion in 'The Shop' started by beedlo, Sep 25, 2012.

  1. beedlo

    beedlo Chimp

    Rep/Likes:
    0 / 0
    Joined:
    Mar 21, 2008
    Messages:
    2
    I have a new set of Shimano Zee M640 brakes. With the bleed block in place, I squeeze the lever until I start feeling pressure (when the pistons start squeezing the block); from this point, I can pull the lever another ~10-15mm if I squeeze harder.

    • Is this flex or is this air?
    • Should the lever be dead stiff?
    • Should there be a bit of flex?
    • How much flex?

    Anyone of you have experience with M810/M640/M820 and lever stiffness? How about other Shimano brakes with Servo Wave?

    My lever felt exactly the same after a bleed, both front and rear.
     

    Please register to disable this ad.

  2. amishmatt

    amishmatt Turbo Monkey

    Rep/Likes:
    20 / 285
    Joined:
    Sep 21, 2005
    Messages:
    1,166
    Location:
    Lancaster, PA
    I've got the new XT's, and they don't feel as solid at the lever as my Juicy 7's or Elixir's did. Better in every way than both, but don't feel as solid (in stock for or after a good bottom up bleed). I moved my pistons closer to the rotors by squeezing the lever a bit with the wheel off the bike, and they feel better after that, but not as solid as any good Avid/Formula/Hope I've tried.
     
  3. buildyourown

    buildyourown Turbo Monkey

    Rep/Likes:
    0 / 0
    Joined:
    Feb 9, 2004
    Messages:
    4,837
    Location:
    South Seattle
    I've got the new XTR and Saint brakes. Both have a lever that you would describe as mushy after coming off Avid brakes. These are both with factory bleeds still.
    They work great though. Took a couple rides to get used too but loving them overall.
     
  4. ridefast

    ridefast Monkey

    Rep/Likes:
    0 / 0
    Joined:
    Jan 25, 2006
    Messages:
    433
    Location:
    Not where I'd like
    Anyone that claims that the new offerings from Shimano are lesser products than Avid obviously haven't set the brakes up properly. Or don't know how to properly evaluate brakes.

    Or have sniffed too much tubular glue.
     
  5. slimshady

    slimshady ¡Mira, una ardilla!

    Rep/Likes:
    52 / 627
    Joined:
    Dec 20, 2007
    Messages:
    2,525
    Location:
    La Plata, Argentina
    Please don't start this again. The people who has commented their experiences with the Shimano brakes vs the Avid ones just pointed out the lever feeling is much more clear on the Avids. Almost everyone agrees with this, leaving aside the performance of the brakes.
     
  6. oldfart

    oldfart Turbo Monkey

    Rep/Likes:
    5 / 12
    Joined:
    Jul 5, 2001
    Messages:
    1,197
    Location:
    North Van
    Do those brakes have a servo wave function? That feels different I think that a brake without. Been on Shimano xt and xtr for the past season and don't recall them feeling much different than the XO I had previously. Shimano are easier to bleed well though.
     
  7. TWeerts

    TWeerts Monkey

    Rep/Likes:
    0 / 0
    Joined:
    Jan 7, 2007
    Messages:
    473
    Location:
    The Area Bay
    That bleed block is plastic, and more compressible than pad backing, material, and a rotor.

    I have experienced a drastically different feel between the bleed block and the installed pads and rotor. That being said, some experience and A/B'ing will allow you to feel a successful bleed even when a bleed block is installed.
     
    #7 -   Oct 30, 2012
    Last edited: Oct 30, 2012
  8. msaman

    msaman Chimp

    Rep/Likes:
    0 / 1
    Joined:
    Dec 6, 2012
    Messages:
    64
    I do not want to hijack this thread but I've got a problem with my M820 brake lever.
    I did bleed my brakes with the yellow plastic block first .The feel I wanted was not firm enough so I put the red plastic between the pads and inject some fluid inside.
    The front one feels perfect now but my rear brake leaks from the lever .I mean I took out all the air and screwed the top screw and after that injected a bit more fluid into the system and the brake started leaking from this golden tap on the side ;(((
    What do you guys think ?
    If you put your finger on the side(this golden tap or what ever colour is on your XTR,XT,SLX) and squeeze the lever few times can you feel a pressure building up there ?
    Cheers guys