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Offline Trophy Tom

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Front brake problem
« on: March 28, 2016, 10:57:47 am »
Have a pulsation in my front brakes not bad at low speed but vary annoying at higher speeds. Took it to the dealer to have the run out on the rotors checked out and they said they were within spec. I thought for sure they were warped so does anyone have any ideas what might be causing this problem? I put a new set of EBC pads on it but that didn't help either
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Offline silverstripes

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Re: Front brake problem
« Reply #1 on: March 28, 2016, 11:21:45 am »
I had the same.

It was my bobbins. the little round things between the rotor and the hub. These are supposed to let the rotor or disk float. they get gummed up.

Put a bolt through them and with a socket or air impact gun rotate them and spray brake cleaner to free then up and hey presto pulsing gone  :047:
It wasn't me !!

Offline Trophy Tom

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Re: Front brake problem
« Reply #2 on: March 28, 2016, 12:15:01 pm »
Thanks Silverside I will give it a try
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Offline twowheeladdict

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Re: Front brake problem
« Reply #3 on: March 28, 2016, 01:30:57 pm »
I noticed the same at the end of my trip.  There was a lot of dust blowing in NM.   Will have to check this out on Saturday.

Offline Dutchie

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Re: Front brake problem
« Reply #4 on: March 28, 2016, 05:20:02 pm »
Mine felt like warped disks too. Also, the front brakes started to make a high pitched whirring sound under breaking. One time, under heavy braking (some cager pulled a stunt on me), the front calipers even got stuck. No wonder, I had rain this winter 4 out of 5 days commuting.

All gone after bobbins were cleaned and brake pads were replaced, brakes cleaned and parts lubricated. This all happened at about 15-16K km.

This bike is hard on it's front brakes and they're sensitive to wet and dirt. Doesn't matter, the bike makes me smile every time I ride it, so I'll just pay more attention to the brakes in future.

Offline Trophy Tom

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Re: Front brake problem
« Reply #5 on: March 29, 2016, 10:06:34 pm »
None of my bobbins move should you be able to rotate them with you finger or does it take a little more force? Stopped at the local and couldn't rotate them on a brand new trophy either.
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Offline DaMonk45

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Re: Front brake problem
« Reply #6 on: March 29, 2016, 10:24:04 pm »
stick a wrench in them and give them a twist.
they should move free

This is one of the better videos that I have seen on cleaning them
https://www.youtube.com/watch?v=nqcHw_t3QlU
« Last Edit: March 29, 2016, 10:30:52 pm by DaMonk45 »

Offline Trophy Tom

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Re: Front brake problem
« Reply #7 on: March 29, 2016, 10:46:50 pm »
Great video thanks so much I'm going to give it a try
Trophy Tom