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Front brakes spongy even after bleeding?

Discussion in 'Biker's Cafe' started by Maz, Nov 23, 2011.

  1. Maz

    Soldato

    Joined: Oct 18, 2002

    Posts: 7,387

    Location: Newcastle.

    The front brakes on my Kwak ZX7R are really spongy!

    The bike has braided hoses and I bled both sides using a vacuum bleeder last week and the brakes feel spongy!

    Am I missing anything obvious?

    I'm going to make sure all the unions are on tight, brake pads are a bit low but I wouldn't have thought that would have caused it.

    Any ideas?
     
  2. jon.bda

    Mobster

    Joined: Oct 28, 2002

    Posts: 4,922

    Location: Shropshire-ville

    Pads and pistons all free and moving properly?
    :)
     
  3. blackninja

    Wise Guy

    Joined: Nov 13, 2007

    Posts: 1,483

    Do you have a bleed screw for anything at the lever/cylinder end? Just checking - my gixxer did.
     
  4. helpimcrap

    Capodecina

    Joined: Jan 13, 2004

    Posts: 12,401

    Location: Leicestershire

    air in the lines. sometimes you have to take the caliper off - wedge a big screwdriver in the pads (so the pistons wont pop out - big job if you mess that up! lol) and hold it upside down to bleed it right!

    had to do that on a GSXR1000 K1 as the caliper bleed nipple isnt 'quite near' the top of the caliper so some air can be trapped in!
     
  5. The Deuce

    Wise Guy

    Joined: Oct 18, 2002

    Posts: 1,933

    Location: In the sticks

    tie your brake lever back overnight then release the air next day, jobs a good un :)
     
  6. helpimcrap

    Capodecina

    Joined: Jan 13, 2004

    Posts: 12,401

    Location: Leicestershire

    this works too. :) in extreme case try my method lol.
     
  7. Felix

    Mobster

    Joined: Jan 25, 2003

    Posts: 2,702

    Above tieing back method was in the Nov edition of Ride mag.
     
  8. kidloco

    Mobster

    Joined: Nov 3, 2003

    Posts: 4,639

    Location: Up-Holland

    Cable tie trick normally works a treat. It's do easy to let air in bleeding the brakes, even with a decent kit.

    Also make sure you pistons move freely. I strip and rebuild mine every 5 months. 1 hour job when you have done it a few times.
     
  9. Snaggle

    Mobster

    Joined: Oct 18, 2002

    Posts: 3,280

    Location: Northants

    My brakes are a pain .. 4 pistons 4 pads .. (brembos) i normally have have to take them off and hang them upside down with a lump of wood between the pads . once there bled i normally have to zip tye the lever back for a day . if you have sliding calipers its worth stripping and cleaning them
     
  10. Souleh

    Wise Guy

    Joined: Oct 26, 2006

    Posts: 1,326

    Location: Belfast, Northern Ireland

    Bleed the MC! Usually the source if youve bled and bled and still spongey
     
  11. Maz

    Soldato

    Joined: Oct 18, 2002

    Posts: 7,387

    Location: Newcastle.

    There isn't a bleed nipple at the cylinder end, they are Toxico 6 pots and 2 of them.

    I'll crack the end off the master cylinder and wrap a rag round it and give it a squeeze, see if that makes any difference.

    But I have a pneumatic vacuum bleeder which I use at my garage, this is what I used to bleed it.

    Done the clutch aswell, and the clutch feels just fine!
     
  12. Souleh

    Wise Guy

    Joined: Oct 26, 2006

    Posts: 1,326

    Location: Belfast, Northern Ireland

    Yep do exactly that. Also tab all around the lines and MC/Calipers with a rubber mallet to try to move any bubbles
     
  13. jon.bda

    Mobster

    Joined: Oct 28, 2002

    Posts: 4,922

    Location: Shropshire-ville

    Theres your problem...get shot of them for some Nissin four pots...
    :D
     
  14. Revolution

    Gangster

    Joined: Sep 8, 2011

    Posts: 148

    Location: Derbyshire

    Tokico`s are fantastic if you can bleed them properly..

    On my TLS standard front end I fitted an RSV mille 1999 master cylinder and Tokico 6 pots...Wow..fantastic.

    Now got Gixxer k5 front end on with radials, and the Mille master cylinder... Ferrodo Sintergrip (STAC) pads and I can brake insanely fast, Michelin Power Ones help too...:p

    http://www.braketech.com/index.php?option=com_content&view=article&id=63&Itemid=94

    Wont ride with anything else now.

    Been at this riding lark for about 24 odd years and when I preach, its for real..:D

    Revo.
     
  15. fullspizz

    Wise Guy

    Joined: Oct 18, 2002

    Posts: 1,673

    Location: Niptons Ridge

    The 6 pot Tokico's are notoriously difficult to bleed correctly for a firm lever.
    I have found that the tie wrap on the lever overnight after a proper bleed helps no end.
    Go very slowly on the bleeding as well, it's very easy to get even a slight whiff of air in there.
     
  16. Revolution

    Gangster

    Joined: Sep 8, 2011

    Posts: 148

    Location: Derbyshire

    True, very true.
     
  17. Maz

    Soldato

    Joined: Oct 18, 2002

    Posts: 7,387

    Location: Newcastle.

    Used the cable tie method and made it a lot better.