Author Topic: Rear brake judder  (Read 3618 times)

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Offline Thisll do

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Rear brake judder
on: July 12, 2017, 02:29:11 PM
My 2016 CB500X, with 15,000 on the clock, just yesterday began to have judder when using rear brake.
This was fierce juddering when braking firmly.
Back home a general check revealed that the disc runs true as far as I can see and externally all seems Ok with the caliper. Brake fluid is a bit low but still clearly above the low level mark.
I have read the thread about front brake judder and wonder if this is a similar thing or something else. Ideas please.

Offline jsonder

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Re: Rear brake judder
Reply #1 on: July 12, 2017, 03:18:37 PM
If you brake "firmly" with the rear, have you checked the brake pads for wear? 

I did a tire change at 15K and still had half the groove, but I do not use the rear except at the start of a hard brake and for slow speed turns.  Even my trail braking is done with the front brake.

I did notice that when I changed the brake fluid that I had a hard time getting the rear to feel right and used a lot of brake fluid before I was satisfied. 
Last Edit: July 12, 2017, 03:22:13 PM by jsonder
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Offline Thisll do

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Re: Rear brake judder
Reply #2 on: July 12, 2017, 03:27:18 PM
I do not use the rear brake as much as the front. Front pads were recently renewed and the rear pads had plenty of life in them.
Its only on a few occasions of more necessary braking using both together that the problem occurs and the judder is clearly felt through the brake pedal.

Offline Britchris

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Re: Rear brake judder
Reply #3 on: July 12, 2017, 04:28:31 PM
Try cleaning the disc.
Sometimes deposits build up on the braking surface which can lead to a juddering feel
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Offline Thisll do

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Re: Rear brake judder
Reply #4 on: July 12, 2017, 05:24:07 PM
Thanks, but its not that. Disc is clean and pads move freely in the caliper.
It has a far more clunky feel than that sort of problem.
I am beginning to suspet it may be the ABS. Unfortunately Haynes Manual gives no useful information, only telling me what different fault codes relate to, which is hardly stuff that I can deal with.
I have to go to the local Honda dealer tomorrow to arrange its 16K service so I'll see what he has to say about it.

Offline Bodysnatcher

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Re: Rear brake judder
Reply #5 on: July 12, 2017, 07:05:57 PM
Hi this might be a stupid thought, but if its just when braking hard, could it not just be the ABS kicking in. Just a thought!

Offline jsonder

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Re: Rear brake judder
Reply #6 on: July 12, 2017, 07:23:30 PM
Not stupid at all; it certainly sounds like the ABS shudder that comes from the ABS releasing the brake as it starts to skid or is close to that (the ring and sensor give it the message and I do not know the specifics on what causes the activation signal).
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Offline AJC500

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Re: Rear brake judder
Reply #7 on: July 12, 2017, 07:45:44 PM
Is the disc still running true - shudder can be caused by a warped disc, I had to replace a damaged disc on my last bike (not a Honda though), caused by brake pads binding and overheating the disc......
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Offline Thisll do

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Re: Rear brake judder
Reply #8 on: July 12, 2017, 10:55:19 PM
I certainly wasn't breaking hard enough for ABS to activate, and I had never experience trhe phenomenom before, riding in all weathers.
The disc runs true and shows no uneven wear.

Offline Irishrover

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Re: Rear brake judder
Reply #9 on: July 12, 2017, 10:58:54 PM
I would suspect it is the ABS activating as you get a strong vibration through the brake pedal. Never been able to activate the front though. My last MOT showed a judder from the rear brake and the rear disc had been replaced with 1000 miles on it. I am sure he was activating the ABS as the garage isn't bike specific. On the re-test no fault was mentioned.
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