Terrifying Rear Break Issue - Wrist Twisters
 
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post #1 of 7 Old 11-28-2016, 03:50 PM Thread Starter
Tirone
 
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Terrifying Rear Break Issue

Hello friends. 3 year reader, first time poster. I'd like to engage your help in trying to figure out what the HELL is going on.

Three weeks ago I had my 919 inspected and had the oil changed after a busy summer of a lot of sitting. Last Sunday it was a gorgeous 55 degree day in Atlanta, GA. I decided to go out for a ride. I pulls up to the stop sign just out of my driveway. A small SUV arrived at the 4 way stop about the same time. They waved me on and I turned left in front of the SUV. Traveling up a steep hill,feeling some unusual and strange resistance, I lifted on the throttle and was shocked as the 919 came to a sudden stop. I dropped the clutch and as I realized some force outside of my control was bringing me to a stop, I tried moving across our typically quiet street to get out of the way from the SUV I knew was following me. I came to an abrupt haut in the middle of the street as of an emergency break was applied. I was nearly hit by the SUV.

I was able, after some struggle, to get turned around and headed back to the house to put an end to the short and bitter ride. I did some searching and found people suggesting to wash the clipper with break cleaner, pound with love via a rubber mallet and all should be well.

This Sunday I tried this fix and set out on another ride. To speed this story up, things went well for the first hour and then I locked up in the middle of a much busier road than the last time. Finally was able to rock into a slightly freeer position, dropped the cluch and basically revved through the break lock to move to safety. Pounded on the caliper and went along fine for the rest of the ride.

Help!?

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post #2 of 7 Old 11-28-2016, 05:11 PM
rmb
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Sounds like it's time to take it apart and inspect... At least, flush the fluid and start from there.

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post #3 of 7 Old 11-28-2016, 05:52 PM
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I would try to bleed the rear brake line and see if that helps. Sounds like you have some air in the line and when it heats up it is expanding and pressurizing the brake line, applying the brakes.

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post #4 of 7 Old 11-28-2016, 06:06 PM
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Any chance someone mixed DOT5 fluid with DOT3/4?

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post #5 of 7 Old 11-28-2016, 07:43 PM
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I've had the same issue with older bikes. Cb750 and shadow 500. With those, it was the seal around the brake piston was swollen. One day you could push the bike, next day the front brake would be locked. I think it was humidity related. Changed the seal and it was fine. About $5 and not much more than a big o-ring. I know a guy who had his front wheel lock while riding from the same problem.

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post #6 of 7 Old 11-29-2016, 09:23 AM
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Rear brake on a 919? Meh... just remove it.



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post #7 of 7 Old 11-29-2016, 11:21 AM
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Either of the above could cause it. The different brake fluids in the system would cause the rubber to swell. Contact the place that did your inspection and oil change. Hopefully if someone did touch your brakes they didn't mix the fluids while servicing the rear. If they didn't touch them, then you could try a simple bleed to check for air in the system or check the seals. Make sure to use a plunger or rubber tool to pull the piston out. You don't want to scratch it.

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