Vibration when braking on front
 

hey guys.... im assuming i need to replace the 4 pads in front and front rotors, as i would with my car if this happens... but...

when i depress the front brake, the bike pulsates like theres a warped rotor or something. the bike brakes fine, but it needs to be taken care of.

i got the pad # fa187hh , i need 2 pairs of them .

but for rotors, theyre quite pricey, anyone got any good links or opinons on rotors? damn i guess i need 2 rotors too eh?

wrapped rotor

+1 I had the same thing happen and it was warped rotors

Mine does it if my front tire pressure is low.. anything below 30 psi cold... Check tire pressure?

yeah the tires are fine. 36 front 42 rear or whatever. . .


so do i need to buy 2 disc rotors? how much and which part # ?

You can buy one - you just have to know which one. The other thing that might be handy is whether or not the rotor was warped by a bad caliper. Doesn't make much sense to throw rotors at it if it's just going to eat them. How many miles on the bike. Bearings OK? I bought a set of pro-lites from a member here and like them. I also have a spare set of stockers if you're interested. They're not new but I trust the source. I know there are some articles in the KB on testing for bad calipers, replacing the bearings is a $40 item - extracting the old ones can be a little tricky but not impossible.

its a 98 with 24k on it .... ill check into the rotors tomorrow. ill read into the kb some more.

Before you jump to the conclusion that it's the rotors you should check the runout. Mine has done the same thing but the rotors were fine. The tire is a likely culprit. Even though the tire looks good and rides good without vibration at speed does not mean it's ok. I've found that front tires which have seen a lot of impact loads can do some funky things. Impact loads are things like bringing down a wheelie and stuff, not that the VTR riders would do such illegal things. Motorcycle tires are unidirectional (there is an arrow on the side that shows which way they are supposed to turn) and the belting is constructed accordingly. There is only one time that the tire is loaded backwards - under braking. They are not constructed the same as tires used on airplanes so they don't do a very good job during 'landings'. Some tires are better than others, but it really depends on how often/bad these occurrences are.

Check, check, check and check again. Never replace a part just because you think it's bad.

I had/have the same issue...It is not as bad now, but still can feel it a little (not tires) I am on my second set of rotors, calipers replaced with RC51's and I still get some pulsing when breaking, like it is slipping a little...not so bad that it makes my butt pucker or anything, but it is still there...Not gonna throw anymore money at it....probably just going to sell at the end of summer, and pick up a dualsport...LOL...nah, gotta keep the hawk...

thanks guys..ill keep ya posted!