Adventure Motorcycle Magazine Subscribe Now

Results 1 to 8 of 8
  1. #1 Spongy front brake 
    C-Moto Not-so-Noob
    Join Date
    Jun 2014
    Location
    USA
    Posts
    19
    Taotao Paladon 150 (CY150). If I pull the front brake the lever almost touches the grip. I have bled the hell out of this system and there was/is no air in it as far as I can tell. It's not spongy like air, it's spongy like cheap brake hose that is expanding.

    I notice that about 50% of the lever travel is just to move the pads to the rotor (about 1 or 2mm), then it's spongy.

    Assuming the spongyness is just the hose expanding, anyone have any tricks to eliminate that first 50% of travel before the brakes contact the rotor? I think if that wasn't there the brake would at least be usable. Right now it smashes my fingers on the grip before I get full braking.
    Reply With Quote  
     

  2. #2 Re: Spongy front brake 
    C-Moto Not-so-Noob
    Join Date
    Jun 2014
    Location
    USA
    Posts
    19
    I think the piston in the caliper may be sticking or something. In other words the self adjustment is not working. I'm going to try removing it and opening/closing the caliper to see if it loosens up and starts adjusting correctly.

    Are there better forums than these where technical people hang out?

    Edit:
    I worked the piston in and out and it doesn't seem to be sticking. When I put it back together I closed the caliper one more "click" than normal so it was tighter on the rotor. This seems to have helped with the initial travel. I think the master cylinder is just releasing the piston too far on the back stroke. Poor master cylinder design or could it have a problem?

    I also played around with the "ABS" pre-load and that seems to have an effect on the spongyness. I need to remove that piece of crap. I believe I need a new banjo bolt to do that though. Anyone know?
    Last edited by sprok; 07-15-2014 at 12:02 PM.
    Reply With Quote  
     

  3. #3 Re: Spongy front brake 
    C-Moto Guru
    Join Date
    Jan 2012
    Location
    Norwich
    Posts
    408
    Perhaps it would help if you fitted a steel braided brake hose, it might not completely fix the problem but it should help.

    Failing that you could try rebuilding the brake calliper, you will be able to see if there is any damage to the seals or rust inside.
    Sinnis Max II (QM125-2V), K157FMI engine (technically a K162FMJ now), 115 main jet, 40 pilot jet, cone air filter, 150cc big bore kit, 17 tooth front sprocket, 30mm carburettor, alarm with remote start, HID spotlights, performance CDI.
    Reply With Quote  
     

  4. #4  
    Banned
    Join Date
    Nov 2011
    Location
    fuck off
    Posts
    528
    Quote Originally Posted by sprok View Post
    Taotao Paladon 150 (CY150). If I pull the front brake the lever almost touches the grip. I have bled the hell out of this system and there was/is no air in it as far as I can tell. It's not spongy like air, it's spongy like cheap brake hose that is expanding.

    I notice that about 50% of the lever travel is just to move the pads to the rotor (about 1 or 2mm), then it's spongy.

    Assuming the spongyness is just the hose expanding, anyone have any tricks to eliminate that first 50% of travel before the brakes contact the rotor? I think if that wasn't there the brake would at least be usable. Right now it smashes my fingers on the grip before I get full braking.
    Remove caliper look at pads where they fit into the shim part - the top side of pads
    The shim is like a spring pressing down pads to stop rattle
    Make sure pads are not catching there
    If you have rubber hose crimp it gently nearer master cylinder
    Is it rock hard then? If yes issue is lower then crimped place
    If no it's above the crimped place and prob master cylinder - 28-80¥
    Calipers 45-90¥
    I actually need a front disc but can't find on Taobao as I can't find the words to search with
    Reply With Quote  
     

  5. #5 Re: Spongy front brake 
    KING of MCM LOL prince666's Avatar
    Join Date
    Apr 2012
    Location
    china (Longkou), Hainan
    Posts
    2,002
    Quote Originally Posted by NZBrakelathes View Post
    Remove caliper look at pads where they fit into the shim part - the top side of pads
    The shim is like a spring pressing down pads to stop rattle
    Make sure pads are not catching there
    If you have rubber hose crimp it gently nearer master cylinder
    Is it rock hard then? If yes issue is lower then crimped place
    If no it's above the crimped place and prob master cylinder - 28-80¥
    Calipers 45-90¥
    I actually need a front disc but can't find on Taobao as I can't find the words to search with

    You can find loads of stuff on MCM just need to look in the correct threads

    to save you some time

    http://www.mychinamoto.com/forums/sh...es-in-Mandarin

    brake 煞車 / 剎車 sha che
    brake caliper 卡鉗 ka qian
    brake light 煞車燈 / 剎車燈 sha che deng
    brake line 煞車油管 sha che you guan
    brake pads 煞車皮 sha che pi
    brake rotor 煞車碟盤 sha che die pan


    What i done was to save all translation for parts on my Iphone
    one day it could come in handy .....
    "Arguing on the Internet is like running in the Special Olympics, even if you win you're still retarded"
    Reply With Quote  
     

  6. #6 Re: Spongy front brake 
    Senior C-Moto Guru humanbeing's Avatar
    Join Date
    Dec 2008
    Posts
    1,509
    Quote Originally Posted by NZBrakelathes View Post
    ...front disc but can't find on Taobao as I can't find the words to search...
    http://s.taobao.com/search?nofestiva...140929&olu=yes
    Last edited by humanbeing; 09-29-2014 at 11:52 PM.
    Reply With Quote  
     

  7. #7  
    Banned
    Join Date
    Nov 2011
    Location
    fuck off
    Posts
    528
    Try again? That's just clothes and crap
    I think my front caliper bracket or fork it self is bent as it makes a noise but I cannot see what's going
    Being alone don't help I can't pull brake spin wheel and see the caliper all at the same time
    Reply With Quote  
     

  8. #8 Re: Spongy front brake 
    C-Moto Not-so-Noob
    Join Date
    Jun 2014
    Location
    USA
    Posts
    19
    I took the "ABS" thing off a long time ago and while it didn't fix the spongyness, it made the front brake grab a lot better. You don't need any extra bolts or anything to remove the "ABS", all the parts are there.

    I think I might try a braided line at some point. I have taken the caliper apart and didn't see anything unusual but I guess it could still be messed up.

    I wonder if there are yamaha/honda parts that could drop in as replacements. The line and master cylinder should be easy but I'm not sure about the caliper, it's probably a clone of a name brand though.
    Reply With Quote  
     

Similar Threads

  1. Front brake Disc calipers for DF250RTC
    By RacerX125 in forum Parts Desk
    Replies: 0
    Last Post: 06-14-2013, 06:42 PM
  2. Replies: 9
    Last Post: 06-12-2013, 04:22 PM
  3. rear brake bleeding
    By PULSEMAN in forum Maintenance
    Replies: 8
    Last Post: 04-26-2013, 06:23 PM
  4. Qingqi 200 front disc brake chattering
    By John LM in forum Maintenance
    Replies: 3
    Last Post: 10-14-2010, 01:36 PM
  5. Lost front brake caliper bolt
    By kingmarty45 in forum Maintenance
    Replies: 7
    Last Post: 01-22-2009, 04:48 AM
Bookmarks
Bookmarks
Posting Permissions
  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •