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Just waiting for my bike to be fixed...

Thanks, everyone.

Right now I just want to get the bike back, ride with the pulsing brakes, and pursue the warranty separately. Jonesing to ride.
 
mojohand

I suggest you try a search for warped discs. IMHO, and many others, warped discs are rare. Tight mounting bobbins are common, as is pad deposit buildup from lack of hard use.

My Breva had brake shudder at low speeds and that was traced to tight bobbins, which I loosened and posted about. Now at 40,000km with original pads and the brakes are one of the bike's strongest points.
 
If the rotors are suspected as warped ,check 'em. Use a dial caliper or mount the end of a 6" rule next to surface of disc and rotate the wheel. Watch for variation in the distance from the end of the ruler.
FBC
 
I affixed a dial caliper to my front rotors and did find some variance. Not a whole lot, about .5000 or so. Not sure if that is enough to cause vibration. I have gone the rivet route and loosened them up or freed them up, making sure they all turned in the hole. Made no difference. Installed new pads, no difference. Next thing is to replace the rotors. Winter project.
 
ncassidy

Runout of 0.5mm is enough to rate as a distorted disc IMHO.

These photos show the runout on my Breva. In inches, sorry. 1 and 1.5 thou respectively. 0.5mm = 20 thou!
Rightfrontdiscrunout1006.jpg

Leftfrontdiscrunout1006.jpg


One of the main causes of (rare) disc distortion is careless handling during tyre changes. That's probably why manufacturers tend to decline warranty claims on warped discs. If a bike still has original tyres fitted then that excuse loses validity.
 
The dealer took the wheel off and ran it through a caliper--no warpage detected. So I'm going to try to "free up the bobbins" (still not sure exactly what that means--would love to see pics from someone showing us what to do) and ride.
 
mojohand wrote:
So I'm going to try to "free up the bobbins" (still not sure exactly what that means--would love to see pics from someone showing us what to do) and ride.

Some pics and info in THIS Breva thread.
 
Remove the disc carriers from the wheel and on the back side of each bobbin you will see a thin washer beneath the roll of the rivet. Use a thin flat screwdriver to separate the flat washer from the petal shaped spring by approx .030" all around. this will allow some clearance to free up the bobbins and the rotor will move freely on the carrier. Reinstall the carriers with loctite.

This is probably a one beer job, depending how thirsty you are B)
 
The dealership at which I work has replaced many truly warped discs. Did two more today. We always try the bobbin trick first.
 
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