TampaGunSlinger
Novice Class
Posts: 95
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posted April 30, 2010 07:03 PM
••••)> HELP! Back brake is rubbing when the rotor gets hot
i have only been riding for 8 months or so, please forgive me for not knowing all this stuff, and i really appreciate al your guys help on here! on my way to work someone cut me off and i had to hit the brakes hard, i had just enough pressure on the back brake lever that the back tire locked up for a sec then rolled the then locked up then rolled it was like anti-lock brakes for 2-3 sec's. about 3 blocks down the road i pulled in to work and when i backed into my spot i felt some resistance rolling the bike... the back rotor was very very hot, and some how the pad was rubbing.. when i got ready to go home it was back to normal... rolling fine.. but by the time i got home it rubbing again and it felt like there wasn't any play in the foot brake lever it was very still like locked, after the rotor cooled it rolled find again...
soo what should i do? i think i'm going to bleed the brakes again. after i got home from the work the day it happened i noticed the rubber cap thing was off the back bleeder valve/port i don't know maybe some air got in there...
any ideas.
the bike is an 06 just hit 4k miles
  
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INTIMIDA2OR
Needs a life
RED rider!
Posts: 13081
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posted April 30, 2010 07:20 PM
There could be a small rock stuck in the caliper . That happened to me once . I tore apart the whole system then got to the caliper and I found 2 small rocks that managed to get stuck in the caliper causing the pads to stay pressed up against the rotor.
Could be air to, but check the caliper for any debris lodged.
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'06 Passion Red ZX-14
*Lee*
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eklipse636
Needs a life
ZX-14
Posts: 6046
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posted May 01, 2010 02:39 AM
Sounds like you could have warped the rotor. I don't know how air would have all of a sudden jumped in there...
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Best: 60ft 1.351 1/8 5.68 mph 123.98 1/4
8.89 mph 151.32
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INTIMIDA2OR
Needs a life
RED rider!
Posts: 13081
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posted May 01, 2010 08:29 AM
That's would be the 3rd warped rotor in the past week if that's what it is. I hop it's not contagious lol! 
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'06 Passion Red ZX-14
*Lee*
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speedgene
Zone Head
Posts: 996
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posted May 01, 2010 09:11 AM
For fluid to expand, there is this bladder under the master filler cap. If you fill that to the top of the edge or past where it says to fill, you now compress that bladder, heat expands, pushes the cap, wrinkles the bladder rubber baby buggy bump hers. Get it?
That's why I don't use my back brake juice for that reason.
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E-tard
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TampaGunSlinger
Novice Class
Posts: 95
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posted May 01, 2010 12:29 PM
i'm going to rebleed them and take that cap off and check that rubber thing, i will let you know what i find after i ride tonight
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TampaGunSlinger
Novice Class
Posts: 95
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posted May 01, 2010 02:24 PM
the fluid was a little low, so i filled it up and pumped them once i will see if that does anything, i don't think its warped cause when it cold and i roll the bike it doesn't rub.. it rolls perfect
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INTIMIDA2OR
Needs a life
RED rider!
Posts: 13081
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posted May 01, 2010 03:21 PM
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'06 Passion Red ZX-14
*Lee*
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TampaGunSlinger
Novice Class
Posts: 95
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posted May 01, 2010 05:34 PM
the brake peddle got stiff and loose a coule time on my 1 hr trip, but when i stoped at ed lights it would always roll... i'm going to bleed them again just to make sure no air in there
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speedgene
Zone Head
Posts: 996
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posted May 01, 2010 06:13 PM
 Edited By: speedgene on 2 May 2010 02:14
There are two ways to find who is clogged or who wrinkled the quad-seal.
1. Heat brake up so it binds.
2. You should have brought tools. Now you bust the master's banjo bolt loose. Go spin the wheel.
3. Tighten it up. Bust the caliper banjo, see if that binds the brake still.
Binds at the master, the return hole is clogged.
Binds at the caliper, the quad-seal has white gunk from water contamination. Oil is heavier than water and crystallizes under that lowest point of the seal. What should return to memory and release the piston that backs off the puck can still bind even if you break the banjo bolt loose. So, you can chase either or this way.
Hose could collapse or has a kink someplace. This is another possibility. Look for a bulge along the line. See, can you understand you release the caliper pressure, the wheel moves. This means the quad-seal can't be it. She will still drag if the seal is not homed. But she backs off under heat, so it can't be that. Remember, the caliper keeps the pad loaded since the seal is lifted out of the groove, cannot relax back in that groove and be square again, thus constant brake drag hot or cold.
So, more like the master has a say or the brake hose. Does it now seem like a caliper bind to you or a hose/master more narrow it down.
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E-tard
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zixxer14
Pro
Damn that was Quick
Posts: 1233
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posted May 02, 2010 06:49 PM
Oil is not heavier than water, it floats on top.
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