rear brake vibration


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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 » Wed Jul 18, 2018 3:58 pm



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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Location: Zephyrhills, Florida
Motorcycle: 89 GL1500
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Re: rear brake vibration

Post by GoldWingrGreg » Wed Jul 18, 2018 4:14 pm

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 » Wed Jul 18, 2018 5:43 pm

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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Motorcycle: 2003 GL1800 Goldwing
1978 KZ650 (needs restoring)

Re: rear brake vibration

Post by 823JIM » Wed Jul 18, 2018 7:26 pm

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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WingAdmin
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Re: rear brake vibration

Post by WingAdmin » Wed Jul 18, 2018 7:32 pm

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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rrahjes
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Location: Parker Co
Motorcycle: 2016 GL1800 AC

Re: rear brake vibration

Post by rrahjes » Thu Jul 19, 2018 7:30 am

I have experienced the same condition on my 2016, 45,000 miles. It started at approximately 15k, shows up after a bit of spirited riding or heavier brake use when 2 up pulling a trailer. Dealer poo pooed it when I brought it up? Rotor shows no pad transfer, and the pulsation/chatter does not happen if the front brake is applied at the same time or slightly before the rear. I just got back from some spirited riding on the BRP and surrounding area, at time the chatter was what I would call violent. I have over 300k on GL1500s, this is my first 1800.

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baumedagn
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Location: Lexington, SC
Motorcycle: 2012
GL1800HPNM

Re: rear brake vibration

Post by baumedagn » Thu Jul 19, 2018 3:15 pm

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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