Join Date: Aug 2018
Location: Hellish Central California
Mentioned: 2 Post(s)
Brake pulsation, or; how I learned to love burning cash at the dealership
Just got home from the Kawasaki dealer... They spent about an hour trying to figure out why my brakes pulsate and came up with questions but few real answers. Also, they charged me $50 for their time since they couldn't figure out how to charge it to Kawasaki.
What they did do: set tire pressure, road test, check rotor runout, visual inspection, etc.
What they found: rotor runout at or below .003, wheel has a nick in it but appears to be properly round, no visible signs of neglect. Brakes pulsate slightly (according to their definition, I guess), especially at low speed. Tire pressures were slightly low.
What they blamed: low tire pressure may be causing the front tire to cup and pulsation while braking.
Huh?!? I don't know what their definition of cupping, but they said it was significant (it's only just starting to show some cupping, and all Road 5 fronts do), and I've NEVER heard of cupping causing a brake pulsation and ONLY a brake pulsation.
Here's what I found after a brief look around the internets: big bikes and big guys with a sense of their own mortality seem to like to hold the front brakes at a stop. This causes crud from the pads to get embedded into the rotor, resulting in a variable coefficient of friction across the swept area of the rotor.
Dressing the rotor surface is supposed to be an effective cure for this, at least until the fat operator bakes more crud into the rotor.
I burned $50 to learn all this. I hope this saves someone here from the same experience.
No mods yet