Front Brake Discs Warping - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 18 Old 05-05-2019, 07:58 PM Thread Starter
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Front Brake Discs Warping

Why oh why are the front brake discs repeatedly warping on my 05 650?
I'm on the third set (original + 2 different manufacturers) and the latest set have only done 15,000km and like the 2 previous sets are now showing 18-20" runout as measured by dial gauge ( the manual specifies 12 thou max). They don't pulse through the lever or show up at speed but are most irritating when coming to a stop as they grab/ release of their own accord.
Adapter brackets from Svracing (not Vstroma as I first posted) were fitted soon after buying the bike new and Tokico 4 piston calipers were installed, but as the same calipers and discs are fitted to Vees they should not be causing warpage.
4 brands of pad have been tried along with vigorous scrubbing of the discs to remove any residue but have had no effect on the problem.
The bike has now done 115,900km and I have been so happy otherwise it was going to be a keeper but the irritation level with the bike over the brakes is increasing.
What to do? Keep buying discs every couple of years - cheaper than buying another bike and having to set it up. Ditch the 4 piston calipers and use the 2 piston originals with new discs and put up with lower braking safety in the hope it fixes the problem?

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Last edited by joethebike; 05-06-2019 at 01:14 AM.
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post #2 of 18 Old 05-05-2019, 08:16 PM
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Strange, I haven't read any threads to date on disc warping.

Are you certain the disks on your 650 are equivalent spec as the vee? Meaning, the only changed variable are the upgraded calipers.
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post #3 of 18 Old 05-05-2019, 09:39 PM
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Quote:
Originally Posted by joethebike View Post
Why oh why are the front brake discs repeatedly warping on my 05 650?
I'm on the third set (original + 2 different manufacturers) and the latest set have only done 15,000km and like the 2 previous sets are now showing 18-20" runout as measured by dial gauge ( the manual specifies 12 thou max). They don't pulse through the lever or show up at speed but are most irritating when coming to a stop as they grab/ release of their own accord.
Adapter brackets from Vstroma were fitted soon after buying the bike new and Tokico 4 piston calipers were installed, but as the same calipers and discs are fitted to Vees they should not be causing warpage.
4 brands of pad have been tried along with vigorous scrubbing of the discs to remove any residue but have had no effect on the problem.
The bike has now done 115,900km and I have been so happy otherwise it was going to be a keeper but the irritation level with the bike over the brakes is increasing.
What to do? Keep buying discs every couple of years - cheaper than buying another bike and having to set it up. Ditch the 4 piston calipers and use the 2 piston originals with new discs and put up with lower braking safety in the hope it fixes the problem?
What type of disc pads are you running?

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post #4 of 18 Old 05-05-2019, 11:37 PM Thread Starter
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EBC, Tokico, Galfer, Metal Gear pads as supplied by the manufacturer of the currently used Metal Gear discs. Usually HH but also organic types.

Current Bikes
2005 DL 650 - 118,500km
1972 Suzuki T350 - about 105,000 miles (including 2 Castrol 6 Hour Races)
1982 Honda CX500EC - 260,500km
All owned from new
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post #5 of 18 Old 05-06-2019, 12:06 AM
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I too have not heard of a problem with discs warping even with the 4 pot upgrade. I'm guessing your brakes are dragging. I just checked VStroma (albeit very briefly) and I don't see any listing for 4 pot caliper adapters. Maybe you should try the SV Racing adapters instead as poor alignment could cause this.

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post #6 of 18 Old 05-06-2019, 01:20 AM
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i have done the same upgrade to my 09 650 and also replaceed the rotors with after market wave dont remember the brand,BUT i have never had any problem with the rotors warping or any other problems. If you have fitted 1000 rotors i would check the compatability, only other i could suggest is been or out of align forks?

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post #7 of 18 Old 05-06-2019, 07:32 AM
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115,900km and three sets. Imho you are not doing to bad. 😉

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post #8 of 18 Old 05-06-2019, 08:40 AM
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Rotors warping should be very rare. By the nature of how they are mounted ( loose "bobbin" style ) they don't heat warp and they are designed to allow the rotor to move so the effect of an imperfect rotor would be hard to feel.

Either the pads are dragging or you have contaminants on the rotor causing a pulsing in braking action that feels just like a warped rotor.

I run the 4 pot calipers. There are no alignment issues with mine. But I would start looking there. Should be very close to equal room for each pad on either side of rotor. If the caliper is sticking, that is an issue that you can check by feeling of them after a ride.
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post #9 of 18 Old 05-06-2019, 12:58 PM
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I can say with confidence that you are not warping the rotors.
You mention that you have scrubbed the rotors to remove deposits. Scrub harder.

Don't be timid about it but be smart about it. Use a wide fine "flat stone" like the kind used to sharpen a knife.

In the long term, everyone should understand that pad material builds up mainly when hot brake pads are "clamped" as you end a ride. You know..., when you get back from a ride and use the front brake to stop in the garage or driveway. The calipers have no spring to open the pads so they cool (and bond) in contact with the rotors. Very gradually the build up occurs as do dirt roads form a "washboard" surface. So as a discipline let your pads cool off during the last mile and make that parking-stop with your rear brake.

Obviously, some folks never experience this build up but that is a matter of riding style / technique.
HTH
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post #10 of 18 Old 05-06-2019, 02:39 PM
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You cannot buy quality products anymore. I have two pickup trucks (Ranger and F-150) and we have had a constant stream of issues with Dealer-Installed rotors and pads. Also, if things aren't installed properly (no-one checks lateral run-out anymore) this can be a constant source of friction and heat. For my ranger, I tried installing heavy duty drilled and slotted rotors, but they warped within 6 months. I don't know what can be done, but I am really tired of paying premium prices for shoddy materials.

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