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Front Brakes Pulsate

S

slybonesjesse

Sport Tourer
Washed bike last weekend, and all week the front forks have an up and down movement under light braking. Its like the brakes grab and release. Under heavier braking doesnt seem so noticable and/or doesnt really do it. Light braking is noticable. Didnt do it before last weekend. In fact didnt do it on a 200mi ride sat, washed bike sun, rode to work mon thinking it was strange and wondering WTF. So I get out there today and pull calipers. Pads are 50% range. Cleaned all up and put back together. Lever feels fine. Didnt anything with rotors. How to measure runout? Min rotor thickness is 4.0mm and mine are both 4.3mm so they are ok that way. Other ideas. Can you wash off the effectiveness. 2003 Concours, 47K COG #6953 IBA 28004 http://mysite.verizon.net/slybones/Concours/connieMain.htm
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Check the rotors for warp. Using a dial indicator measure the axial runout (side to side) I believe the repair manual has specs for this as well. However you mentioned the forks? A warped rotor will feel like a definite wobble when braking (bent one of mine while forgetting to remove a fork lock! -boy that was a very short trip!) But this up and down feeling in the forks to me, indicates something else. If the axial runout is within spec I'd then be checking your forks for any "stick-tion" condition. Perhaps the seals or the wipers aren't functioning like new. If you've recently hit anything hard, IE: pothole curb etc. You could have a slightly bent fork. Also check out if the pucks in the calipers are pressing out straight and they are not coming out at an angle (usually indicated by pads that are worn at an angle as well.) Perhaps one or both calipers is in need of service. AKA "2linby" That's 2-lin-by folks! Northwest Area Director COG #5539 AMA #927779 IBA #15034 TEAM OREGON MC Instructor http://community.webshots.com/user/2linby http://tinyurl.com/njas8 (IBA BunBurner Gold Trip) http://tinyurl.com/lwelx (Alaska trip)
 
Can't help, but I had a V65 Honda Magna that did the same thing on the rear disc. Every thing checked to specs, new pads and it still did it. 40000 miles later when I sold it it was still pulsing.
 
Might have dripped some oil on a rotor? You could try just cleaning all 4 with brake cleaner and maybe a light sanding. Check to see if a fork could be leaking down and dripping on rotor. ---------------------------------- South Central Area Director Email scad@cog-online.org
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Well just my cleanup and inspection of the pads yesterday made it all better. Worked fine this morning. 2003 Concours, 47K COG #6953 IBA 28004 http://mysite.verizon.net/slybones/Concours/connieMain.htm
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Pads will leave residue buid-up ..can give ya a real pulsing !! Cleaning rotors with brake cleaner and steel wool will correct this....you learn this early on if you buy a Buell !!!! Be sure to clean off ALL brake cleaner as well...hope this helps.
 
Pads will leave residue buid-up ..can give ya a real pulsing !! Cleaning rotors with brake cleaner and steel wool will correct this....you learn this early on if you buy a Buell !!!! Be sure to clean off ALL brake cleaner as well...hope this helps.
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Yes, this is something Elvin clued me in on some time back. Part of my "Spring cleaning" is taking a green Scotch-brite pad and some brake cleaner, and giving the rotors a good scrubbing. Helps keep things in good order. Now I'll have to give the calipers as much attention, so I don't drop any more brake pads... Mike B / Gig Harbor, WA
 
I have been reading up on this brake pad dropping thing. It sounds like pads dropping out has something to do with incorrect installation. I still do not have it clear in my head but seems you can put the pads in backwards? This will allow them to function for a while and then drop out as they ware. If anyone has a pic of right and wrong way that would sure help a lot of the group. It is strange that they are designed where this can happen at all. ---------------------------------- South Central Area Director Email scad@cog-online.org
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