Brake rotor warp issue - Triumph Forum: Triumph Rat Motorcycle Forums
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View Poll Results: Has your Sprint experienced Rotor warping?
Yes I have had Rotor warp problems 15 31.25%
No I have not had Rotor warp problems 33 68.75%
Voters: 48. You may not vote on this poll

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post #1 of 22 (permalink) Old 07-01-2009, 04:55 AM Thread Starter
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Brake rotor warp issue

Has your Sprint had rotor warping problems?

I have not on either of my 955's Sprint or Daytona but a few of you have so ths should help gauge how big or small an issue it really is.

63,000kms on my Sprint ST. 11,000kms on Daytona 955

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post #2 of 22 (permalink) Old 07-01-2009, 07:15 AM
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I have recently noticed a very slight pulsing during braking on my '04 Sprint. It is only noticeable when applying the brake lightly at low speed, such as when approaching traffic lights etc.

I suspect the cause may be brake pad material on the rotors, rather than a warped rotor. I changed the pads, but the problem persisted. When I get a chance I intend to clean / lightly sand the rotors and see if that rectifies the issue.

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post #3 of 22 (permalink) Old 07-01-2009, 07:55 AM
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Yes, uneven pad deposition is usually the cause of brake pulsing on cagers. Not sure about motorbikes though.
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post #4 of 22 (permalink) Old 07-01-2009, 08:37 AM
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I warped(out of tolerance) a rotor on my '99, and I warped(just to the edge of tolerance) both OEM rotors on my '02. Waiting to see how the '08 holds up. I ruined the replacement rotors on the '02 when I foolishly let a soaking wet bike sit overnight. The EBC HH pads rust bonded to the rotors(which I believe were also EBC parts). When I broke them loose the next morning they scored the rotors where the pads were bonded too them, creating a pulsing during braking.

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post #5 of 22 (permalink) Old 07-01-2009, 08:45 AM
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Warped rotors at about 26K. Cost me close to $600 for the rotors plus 2 hours labor. 06' Sprint.
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post #6 of 22 (permalink) Old 07-01-2009, 12:29 PM
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On 3rd. set of pads fronts and originals rear. No issues at all. 12k+miles

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post #7 of 22 (permalink) Old 07-01-2009, 04:58 PM
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Yup, but....

Quite a few of you have seen me post several times about this....

I think most of the warping issues are down to dirty bobbins. Certainly I have directly 'rescued' a number of machines over here that were diagnosed with "warped Discs" by cleaning and spinning the bobbins. If they are left dirty enough for long enough the discs will warp as when they heat up under braking, they cannot expand evenly. Catch it soon enough and they go back to being okay. I had my first set changes at 12,000 miles and the tech told me about this.... haven't had another set, and I know that Steventhechef has done this when he thought he had warped discs, and lo and behold..... they were fine.

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post #8 of 22 (permalink) Old 07-01-2009, 05:05 PM
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Quote:
Originally Posted by elevens View Post
Yes, uneven pad deposition is usually the cause of brake pulsing on cagers. Not sure about motorbikes though.

Welll...... I have to disagree some what. Your pads go on in only one position on a vehicle and are locked in that position.

A real cause of pulsing on a vehicle is that the rotors have not been indexed to the car. As far back as 2002 hub assemblies have not been machined to perfection and manufacturers took to oncar brake lathes. They would mount the rotors then turn the rotors with an on car brake lathe to index them.

Aftermarket shops dont do this and you get pulsing.

On motorcycles with floating disks dirty bobbins can be a cause of pulsing. Clean up the bobbins and usually it goes away.
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post #9 of 22 (permalink) Old 07-01-2009, 05:24 PM
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I had the pulsing/loss of lever on my bike once she was back on the road. I convinced myself that the rotors were warped. But upon the guidance of members here they steered me towards stuck bobbins. Which was the case, but being as I'm lazy I just swapped my old set which were fine for the stuck set and all was good again.

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post #10 of 22 (permalink) Old 07-01-2009, 07:10 PM
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Quote:
Originally Posted by Calliway View Post

A real cause of pulsing on a vehicle is that the rotors have not been indexed to the car. As far back as 2002 hub assemblies have not been machined to perfection and manufacturers took to oncar brake lathes. They would mount the rotors then turn the rotors with an on car brake lathe to index them.
Excellent point!

In fact, any rotating part that can be installed in more than one orientation should be marked (indexed) so that it reinstalls in the original position.

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