Brembo monobloc howling sound. - Ducati.ms

BeHyper · Jun 13th, 2009, 7:08 pm

I have about 5,000 miles and the stock brake pads on. When I hit the front brake it sounds like a garbage truck's brakes, just before I get to a complete stop. I feel a slight vibration and a howling sound (not really a squeal).

I sprayed the back of the brake pads with adhesive spray (Disc Brake Quite) in an attempt to have the pads stick to the pistons and therefore stop the vibration, but I didn't solve the problem.

My next try will be to have the pads and the rotors sanded in order to remove any glazed surface.

I know this subject has already been covered in this forum in the past.

But I'm curious to know how many Hypermotard out there are still experiencing this issue and if sanding the pads and rotor solved their problem.

MongoWERA · Jun 13th, 2009, 9:12 pm

I have it on occasion and honestly don't care so I ignore it.

bromike666 · Jun 13th, 2009, 9:20 pm

Mine did it until my mechanic couldn't take it and sanded the pads. Never really bothered me much I wear custom molded earplugs. Compared to the brake shudder on my first Multistrada (scary sh*t) it's a minor annoyance.

motopix · Jun 13th, 2009, 10:45 pm

I thought someone traced this to a resonance going into the fender and elimated it by adding some rubber grommets/spacers between the fender mounts and the fender.

I get it pretty frequently too and at some point I'll try the rubber grommet trick but otherwise it doesn't bother me.

BeHyper · Jun 13th, 2009, 11:36 pm

Well, I also read about that and I tried the rubber washer between the fender and the mounts but it didn't work.

That's neither the problem nor the solution.

dukepilot · Jun 14th, 2009, 12:02 am

Don't "sand" the rotor. The proper tool to use is a rotor hone at low rpms. This maintains the cross hatching on brake rotor. You can lightly sand the pads to knock off any shine on the surface of the pads.

Before you do the rotor hone, try cleaning each rotor thoroughly with paper towels and brake cleaner. Deposits build up on the rotor and produce the sound/vibration that you are feeling. I clean the rotors at each oil and tire change.

motopix · Jun 14th, 2009, 12:18 am

Sorry to hear the rubbers didn't work.
As for cleaning the rotors off every oil change, I think it's just coincidence that that works. I have less than 300 miles on my bike and it's doing it already. I suppose deposits could build up more slowly after the pads are initially bedded in but I'm sceptical.

When I pull my calipers to try to fix the brake pump, I'll probably pull the anti-rattle plates to see if that fixes the howling: my next best guess.

dukepilot · Jun 14th, 2009, 12:25 am

Quote:

Originally Posted by motopix

Sorry to hear the rubbers didn't work.
As for cleaning the rotors off every oil change, I think it's just coincidence that that works. I have less than 300 miles on my bike and it's doing it already. I suppose deposits could build up more slowly after the pads are initially bedded in but I'm sceptical.

When I pull my calipers to try to fix the brake pump, I'll probably pull the anti-rattle plates to see if that fixes the howling: my next best guess.

You can be skeptical if you want but cleaning the rotors was one of the first things I did when I picked up my bike from the dealer when it was new. This is especially important when the bike is new. The rotors have a coating of sticky stuff on them to prevent corrosion during shipping. Its not a heavy coating but its there. Cleaning is easy enough to do.

motopix · Jun 14th, 2009, 12:35 am

I should have added that I did clean them off with brake cleaner after about 100 miles.

If it had any bearing you wouldn't need to keep cleaning them.

Come to think of it, I had an 03 gsxr750 w/galfer rotors and vesrah pads that would make the howling sound. Since it was a track bike I only ever heard the howling in the pits but it was definitely the same sound. And that setup had no rattle pads so I'm now thinking that won't fix it either.

Trials/Rider · Jun 14th, 2009, 7:33 am

Quote:

Originally Posted by motopix

I should have added that I did clean them off with brake cleaner after about 100 miles.

If it had any bearing you wouldn't need to keep cleaning them.

Come to think of it, I had an 03 gsxr750 w/galfer rotors and vesrah pads that would make the howling sound. Since it was a track bike I only ever heard the howling in the pits but it was definitely the same sound. And that setup had no rattle pads so I'm now thinking that won't fix it either.

How about a small chamfer on the leading edge of the brake pad?