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Old 06-19-2014, 07:20 PM   #1
packersfan7831
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Still Dealing with first drop... feel like i may be getting the runaround.

Ok so i finally got my right clip on attached and the bike running again, but now i have a very mushy front brake... At rest, the brake grabs like normal, but once the bike is moving there is very little braking power... the lever pulls all the way in and it only feels like around 70% of the front brake.... If i pump the brake while slowing down it builds the pressure back up... Me and a buddy bled the brakes for about 30 minutes, but granted ive never bled bike brakes before so we may not have done it properly... I took the bike to a local mom and pop and he told me it was a bent rotor... hes gonna start working on it in the am, but it just feels off to me... seems like a master cylinder seal or something with the way it holds perfectly at rest but not in motion... theres no jerking or stuttering in the stop. Theres no visable bend in the rotor.... Hes not charging me much to replace the rotor at all, but idk... after reading about how hard it is to bleed all the air outta sport bike lines, it seems to me like this could legitematly just be air in my line, with this guy giving me the runaround... And the shop is Airline Motorcycle center, with andre being my contact there if anyone has any thoughts

2012 yamaha r6 btw
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Old 06-19-2014, 07:38 PM   #2
bumblebee
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Did you have the forks off or loose?
If the front was loosened it may be misaligned and the rotors could have pushed the pads in.
have you tried pumping the brakes while in motion?
A warped rotor pulses, it doesn't cause no brakes at all.
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Old 06-19-2014, 07:48 PM   #3
packersfan7831
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I didnt have the forks off or loose,but the bike did impact the curb at about 10mph with the front wheel...pumping the brakes while the bike is moving gives me almost all my brake
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Old 06-19-2014, 07:55 PM   #4
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Sounds like a bent rotor to me...as the slight bend/warp gradually pushes on one side of the caliper it pushes that pad in and the other side comes out but not hard enough to feel like full stopping power. The floater rotors make it worse because they can move even more. Solid mount rotors would pulse. Andre has been around for a long time, he has seen this before. I don't think you are getting the run around. Your rim could be warped....depends on how hard it hit the curb....10mph with how much force?? nobody really knows...physics is crazy....

Now if he recommended a frame swap, I would be suspicious.

Last edited by signpimp; 06-19-2014 at 07:58 PM. Reason: stuff
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Old 06-19-2014, 08:00 PM   #5
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I think you said you live on the north part of town, if you would like I can take a quick look at it to see if I can help you catch something on there. PM me if you want and i'll send you my address if you ride it by
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Old 06-19-2014, 08:00 PM   #6
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Ok that makes sense then,if the rotors float....i guess ill just go ahead and let him fix it? Just wanted to make sure the symptoms matched what he was telling me
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Old 06-19-2014, 08:03 PM   #7
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Bent rotor I'd say. Same thing happened to me on my r6. Previous owner dropped the bike, bent the rotor, and before i replaced it I had to pump the brakes to get pressure
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Old 06-19-2014, 08:07 PM   #8
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Also I have extra rims for r6's in my garage with good tires and everything on them. If you want to swing by try the rim w/ perfectly straight rotors then you can put it on and ride around the neighborhood or up the road real quick to find it if thats the issue. I know they're 100% because Ive used them at the track, i just use extra wheels at the track
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