ZZR-250 Front Brake Question

johnjohn · August 30th, 2010, 09:42 AM

Well it may have been answered but I giving this way a shot first. I seem to have a slight shudder when coming to a complete stop coming from the front wheel area. It is only when just before the complete stop. Bear in mind I am not locking the pads up but applying gentle drag with both front and back brakes while going through the gearing down process. Any answers or ideas? All mounting bolts for the caliper are tight and nothing loose up front. Could a bearing drying out of grease be a cause? There is not heat in the disc when this happening, as I can grab it with the bare hand. The disc is not bent.
Could crud embedded in the pads maybe cause this. So many questions!!!!

Cali619 · August 30th, 2010, 10:18 AM

Quote:

Originally Posted by johnjohn

Well it may have been answered but I giving this way a shot first. I seem to have a slight shudder when coming to a complete stop coming from the front wheel area. It is only when just before the complete stop. Bear in mind I am not locking the pads up but applying gentle drag with both front and back brakes while going through the gearing down process. Any answers or ideas? All mounting bolts for the caliper are tight and nothing loose up front. Could a bearing drying out of grease be a cause? There is not heat in the disc when this happening, as I can grab it with the bare hand. The disc is not bent.
Could crud embedded in the pads maybe cause this. So many questions!!!!

I have the same issue recently and already cleaned off the disk and sprayed down caliper/pads with break cleaner. Im takin the bike into the shop for em to test drive and see what it can be. Ill keep you posted on what I find out.

Alex · August 30th, 2010, 10:22 AM

Only happens with the front brake on? With the brake off there is no shudder? Most likely cause is a warped rotor.

johnjohn · August 30th, 2010, 01:53 PM

Only happens when I am almost stopped. If it was a warped disc it would be all the time with a shudder. So I would rule that theory out from the start.

Alex · August 30th, 2010, 01:56 PM

True, a warped disk would most likely be even more noticeable at higher speeds, you're right.

Cali619 · August 30th, 2010, 03:08 PM

Quote:

Originally Posted by Alex

True, a warped disk would most likely be even more noticeable at higher speeds, you're right.

I googled around and lot of people with same issue, several different types of sportbikes said it can be brake pad debris left on the rotor to make it uneven. Like break out a micrometer uneven.

One solution was to take some 400-600 grit sand paper and smooth out the rotor. Im gonna take a look at mine and see if there is uneven wear or excess debris.

johnjohn · August 31st, 2010, 04:38 AM

Sounds logical. Will clean the pads and give the disc a clean up and see how it goes. This bike being a 2001 was in storage for 5 years and had a miserly 2500 K's on it when I picked it up a month ago. Other than the slow down shudder it is perfect, just like it came from the showroom floor. Thanks for the replies.

August 30th, 2010, 09:42 AM	#1
johnjohn ninjette.org member Name: John Location: Caledonia, Ontario, Canada Join Date: Jul 2010 Motorcycle(s): Honda, Buell, Kawasaki, Suzuki, Yamaha Posts: 170	ZZR-250 Front Brake Question Well it may have been answered but I giving this way a shot first. I seem to have a slight shudder when coming to a complete stop coming from the front wheel area. It is only when just before the complete stop. Bear in mind I am not locking the pads up but applying gentle drag with both front and back brakes while going through the gearing down process. Any answers or ideas? All mounting bolts for the caliper are tight and nothing loose up front. Could a bearing drying out of grease be a cause? There is not heat in the disc when this happening, as I can grab it with the bare hand. The disc is not bent. Could crud embedded in the pads maybe cause this. So many questions!!!!

August 30th, 2010, 10:22 AM	#3
Alex ninjette.org dude Name: 1 guess :-) Location: SF Bay Area Join Date: Jun 2008 Motorcycle(s): '13 Ninja 300 (white, the fastest color!), '13 R1200RT, '14 CRF250L, '12 TT-R125LE Posts: Too much. Blog Entries: 7	Only happens with the front brake on? With the brake off there is no shudder? Most likely cause is a warped rotor. __________________________________________________ Montgomery Street Motorcycle Club / cal24.com / crf250l.org / ninjette.org ninjette.org Terms of Service Shopping for motorcycle parts or equipment? Come here first. The friendliest Ninja 250R/300/400 forum on the internet! (especially Unregistered)

August 30th, 2010, 01:56 PM	#5
Alex ninjette.org dude Name: 1 guess :-) Location: SF Bay Area Join Date: Jun 2008 Motorcycle(s): '13 Ninja 300 (white, the fastest color!), '13 R1200RT, '14 CRF250L, '12 TT-R125LE Posts: Too much. Blog Entries: 7	True, a warped disk would most likely be even more noticeable at higher speeds, you're right. __________________________________________________ Montgomery Street Motorcycle Club / cal24.com / crf250l.org / ninjette.org ninjette.org Terms of Service Shopping for motorcycle parts or equipment? Come here first. The friendliest Ninja 250R/300/400 forum on the internet! (especially Unregistered)

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August 30th, 2010, 01:53 PM	#4
johnjohn ninjette.org member Name: John Location: Caledonia, Ontario, Canada Join Date: Jul 2010 Motorcycle(s): Honda, Buell, Kawasaki, Suzuki, Yamaha Posts: 170	Only happens when I am almost stopped. If it was a warped disc it would be all the time with a shudder. So I would rule that theory out from the start.

August 31st, 2010, 04:38 AM	#7
johnjohn ninjette.org member Name: John Location: Caledonia, Ontario, Canada Join Date: Jul 2010 Motorcycle(s): Honda, Buell, Kawasaki, Suzuki, Yamaha Posts: 170	Sounds logical. Will clean the pads and give the disc a clean up and see how it goes. This bike being a 2001 was in storage for 5 years and had a miserly 2500 K's on it when I picked it up a month ago. Other than the slow down shudder it is perfect, just like it came from the showroom floor. Thanks for the replies.