brakes pulsing - Service, Repair, and Maintenance

whauburger · 08-18-2008, 01:11 PM

This weekend I put dirt bars on and swapped the front brake lines to steelies and when I went to practice some endos yesterday everytime I'd come up the brakes would pulse almost and my front end would shake. Its on an 06 636 and I never had that problem b4 I swapped out. any ideas on what I prob. forget to tighten down?

TongWoo · 08-18-2008, 01:45 PM

I have the same prob with my RR. Front tire is bouncing off the ground under braking. Rotors are straight... I don't think it could be caused by air in the lines. I'm thinking it's a broken bushing in the fork tube???

Towlieee · 08-18-2008, 02:27 PM

It's either bent rotors (you don't be able to physically SEE the bend..)

or a loose steering stem nut/worn steering stem bearings

or loose clip-ons, or loose triple..

my f4i's rotors were fucked when I bought it with only around 12k on it

TongWoo · 08-18-2008, 02:45 PM

Quote:

Originally Posted by Towlieee

It's either bent rotors (you don't be able to physically SEE the bend..)

or a loose steering stem nut/worn steering stem bearings

or loose clip-ons, or loose triple..

my f4i's rotors were fucked when I bought it with only around 12k on it

It's so wierd because my bike will do it even at way low speed. -it's like a.b.s. or something. I checked my rotors with a straight edge and they're cool. So weird...

Wheeliest · 08-18-2008, 03:00 PM

only way u can truely check rotors is with a run-out gauge.. and i get a insane vibration on my 954 and my rotors are not warrpped. when i try stoppies the vibration will progressively get worse as the slower they go vibrating violently. im thinking worn/broke bushing...

TongWoo · 08-18-2008, 03:18 PM

Word. Thanks for the info!

whauburger · 08-18-2008, 07:59 PM

Im pretty positive it isn't the rotors or any bushings cuz it wasn't doing it the day b4, just after I put the bars on and now that I think of it I prob. forgot to tighten down the steering stem nut good cuz I wasn't sure if I was going to have to add risers to clear the top adjusters, when I get home im going to check it out thanks towliee

poni · 08-18-2008, 08:07 PM

yea dude, for next time, you have to use a dial-indicator guage and you note the min, and maximum the dial "wows" from,...anything over 0.40" is way too much...my buddy put brand new pads and rear rotor on his bike and smoked the pads and ruined his new rotor/disc....he didn't break-in the disc properly and spit the pad core out during a BP application....take care of your shit and next time you go to 12 it your ass wont look like burnt pizza.

YogiR6 · 08-27-2008, 11:19 PM

I had this same problem on My Current bike. I bought new pads for it thinking that was the Problem. WRONG. So I said fuck it I cant Afford new rotors right now and the problem ended up working it's self out in about 2 weeks. It is beyond me, but mine is good now.

08-18-2008, 01:11 PM	#1
whauburger Registered User Join Date: Aug 2007 Location: Middletown, NY, USA Age: 21 Bike: 06 sies tres sies, 06 ltz 250, 07 crf50 Gender: Male Posts: 202	brakes pulsing This weekend I put dirt bars on and swapped the front brake lines to steelies and when I went to practice some endos yesterday everytime I'd come up the brakes would pulse almost and my front end would shake. Its on an 06 636 and I never had that problem b4 I swapped out. any ideas on what I prob. forget to tighten down?

08-18-2008, 01:45 PM	#2
TongWoo I'm Back! Join Date: Feb 2004 Location: Roanoke, VA Age: Bike: 2007 600RR Gender: Male Posts: 2,406	Re: brakes pulsing I have the same prob with my RR. Front tire is bouncing off the ground under braking. Rotors are straight... I don't think it could be caused by air in the lines. I'm thinking it's a broken bushing in the fork tube???

08-18-2008, 02:27 PM	#3
Towlieee Registered User Join Date: Oct 2004 Location: Anywhere wheelies happen Age: 21 Bike: 02F4i 05Fiddy 05Crf150 Gender: Male Posts: 3,340	Re: brakes pulsing It's either bent rotors (you don't be able to physically SEE the bend..) or a loose steering stem nut/worn steering stem bearings or loose clip-ons, or loose triple.. my f4i's rotors were fucked when I bought it with only around 12k on it

08-18-2008, 03:00 PM	#5
Wheeliest I Love To Post! Join Date: May 2004 Location: Avondale Az Age: 25 Bike: 03 954 RRRRR Gender: Male Posts: 8,812	Re: brakes pulsing only way u can truely check rotors is with a run-out gauge.. and i get a insane vibration on my 954 and my rotors are not warrpped. when i try stoppies the vibration will progressively get worse as the slower they go vibrating violently. im thinking worn/broke bushing... __________________ I Powder Coat - PM ME! WWW.FOX-CONCEPTS.COM coming soon...

08-18-2008, 03:18 PM	#6
TongWoo I'm Back! Join Date: Feb 2004 Location: Roanoke, VA Age: Bike: 2007 600RR Gender: Male Posts: 2,406	Re: brakes pulsing Word. Thanks for the info!

08-18-2008, 07:59 PM	#7
whauburger Registered User Join Date: Aug 2007 Location: Middletown, NY, USA Age: 21 Bike: 06 sies tres sies, 06 ltz 250, 07 crf50 Gender: Male Posts: 202	Re: brakes pulsing Im pretty positive it isn't the rotors or any bushings cuz it wasn't doing it the day b4, just after I put the bars on and now that I think of it I prob. forgot to tighten down the steering stem nut good cuz I wasn't sure if I was going to have to add risers to clear the top adjusters, when I get home im going to check it out thanks towliee

08-18-2008, 08:07 PM	#8
poni Registered User Join Date: May 2008 Location: Canada Age: Bike: fab'd 50cc munkey bike, YZF600banana seater beater Gender: Male Posts: 474	Re: brakes pulsing yea dude, for next time, you have to use a dial-indicator guage and you note the min, and maximum the dial "wows" from,...anything over 0.40" is way too much...my buddy put brand new pads and rear rotor on his bike and smoked the pads and ruined his new rotor/disc....he didn't break-in the disc properly and spit the pad core out during a BP application....take care of your shit and next time you go to 12 it your ass wont look like burnt pizza.

08-27-2008, 11:19 PM	#9
YogiR6 www.tobefast.com Join Date: Aug 2008 Location: Pikeville, Kentucky Pike County Age: 19 Bike: Yamaha R6/ YZ250F Gender: Male Posts: 279	Re: brakes pulsing I had this same problem on My Current bike. I bought new pads for it thinking that was the Problem. WRONG. So I said fuck it I cant Afford new rotors right now and the problem ended up working it's self out in about 2 weeks. It is beyond me, but mine is good now.