rear brake vibration


Information and questions on GL1800 Goldwings (2001-2017)
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tequilla
Posts: 3
Joined: Sat Apr 19, 2014 5:48 am
Location: Rochester, Minnesota
Motorcycle: 2014 GL1800
1983 Gl1100A

rear brake vibration

Post by tequilla »



I have a 2014 wing that ocasionally when I used the back brake I get a vibration like it is dragging on the cooling holes. If I use the front brake when I feel it starting and then apply the back brake then it doesn't do it. Anyone else experienced this?


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GoldWingrGreg
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Re: rear brake vibration

Post by GoldWingrGreg »

tequilla wrote: Wed Jul 18, 2018 3:58 pm ... I get a vibration like it is dragging on the cooling holes. ...
Sorry ... I'm not sure what cooling holes are. Could it be more accurately described as "feeling like braking on a cobble stone road ???" If so, the only known cure is operating the the bike with both brakes. This symptom is known to randomly happen on hot days. Some member might give advise about a specific bleed sequence, however, many have tried it only to have the symptom randomly re-occur. If you complain to Honda about it, they will advise you operate the m/c with both brakes.
tequilla
Posts: 3
Joined: Sat Apr 19, 2014 5:48 am
Location: Rochester, Minnesota
Motorcycle: 2014 GL1800
1983 Gl1100A

Re: rear brake vibration

Post by tequilla »

Thanks, thats exactly what it feels like. funny thing is I had a 02 and 08 and never had it happen on them. On this 14 it happened the first year and then like you say, randomly happens. Thanks again.
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823JIM
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Re: rear brake vibration

Post by 823JIM »

I have an '03 that does the same thing occasionally. Tried to show my brother what it does and couldn't make it do it. I have wondered if anyone else had this too. Brother says his '04 has never done it.
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Re: rear brake vibration

Post by WingAdmin »

The vast majority of time what people perceive as brake vibration or "warped rotors" is in fact brake lining material fused to the brake rotor.

What happens: you come to a hard stop from high speed, holding the brakes on hard. You have now raised the temperature of your rotors as high as 800 degrees - and then clamped your brakes to the rotor. Part of the brake pad bonds to the rotor, or the rotor gets tempered slightly in the location of the brake pads...the end result is, you have a section of the brake rotor that has brake pad material on it. You can actually see this - a mark on the rotor in the shape of a brake pad.

This section of the rotor now has a different friction coefficient than the rest of the rotor, so from then on, whenever you are braking, you get a pulse every time that section of the rotor passes under the brake pads.

You can get the rotors turned in a lathe if it's a car, which will fix it. On a bike, with the hard rotors, not so much.

The lesson is: if you have to brake hard to come to a hard stop, don't hold the brakes on after that. I always try to let the vehicle creep a little bit, to let the rotors cool without being trapped under the pads.
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baumedagn
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Re: rear brake vibration

Post by baumedagn »

Do you feel the "vibration" in the pedal? Or is it brake "chatter"? Have you had the recall done? After the dealer did mine, they didn't bleed the system totally and when the brakes get hot, I would get a chatter in the rear brake.


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