Question about brake rotors... - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 11 (permalink) Old 03-19-2011, 01:11 AM Thread Starter
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Question about brake rotors...

Just wondering if the brake rotors on the Vulcan are supposed to be taken to a machine shop like car brake rotors would be... I thought I saw a post where someone said they weren't supposed to be machined, but I couldn't find it, so I had to make another post.

So should they be machined when I change the front brake pads? Also, do they sell new ones anywhere?
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post #2 of 11 (permalink) Old 03-19-2011, 10:07 AM
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Hi Ceal:
I have not heared of anyone machining motorcycle rotors. If they are very scored they can be replaced, but I think they are too thin to machine off enough metal to remove scoring. Unless they are below minimal thickness or deeply scored I don't think there is any harm in just replacing the pads. I have done so in the past without any problems on other bikes.
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post #3 of 11 (permalink) Old 03-19-2011, 12:17 PM Thread Starter
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hmm I think it was you who I saw post it before lol. I can't get the hang of the search option on this forum though, so I couldn't find it again.

So who sells new rotors for our bikes? I don't think mine need to be replaced, but it's always good to know, just in case...

Also, what do you think about sanding the rotors a bit just to remove any rust or glazing there might be? Maybe better to not mess with them at all?
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post #4 of 11 (permalink) Old 03-19-2011, 01:30 PM
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Well, I don't think I have posted on rotors before. Cheap cycle parts may have the rotors for our bikes at better prices that a stealership. Sometimes they can be found on Ebay.
I can't see any advantage to sanding them unless there is a residue or something glazing the metal. I would leave them alone if still in good shape. The enemy of good is better sometimes.
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2005 VN 750
MF Battery
Plexistar windshield
.040 pilot jets.
Splines lubed 1955 mi.
Marbled
Iridium plugs
Reset pickup coil gaps.
Metzeler ME=880s
Shindengen MOSFET RR
V & H Cruzers
Degoated
Speed bleeders
MCCTs.
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post #5 of 11 (permalink) Old 03-19-2011, 02:24 PM
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I bought a set of OEM rotors from a friend of mine with a parts bike then took them to work and machined them on a lathe at work. They turned out pretty good(certainly not a factory finish though) I am still waiting to install them on the bike. Since they are not designed to be resurfaced I really don't see any shops resurfacing them for anyone due to safety concerns. Since they are drilled they need to be ground down wit a stone of some type in a lathe. I used a carbide cutting tool (you have to use Carbide because these rotors are made of an extremely hardened steel, It will eat up a normal lathe steel cutting tool) And using this cutting technique you will have to go extremely slow and make multiple passes because the cutting bit hits the drilled holes in the rotor and causes a slope on the back side of the hole. So far the cheapest I have found for aftermarket rotors is 320.00. for a set to my front door. If any of you have found them cheaper please tell us where in this thread ...Thank You!
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post #6 of 11 (permalink) Old 03-19-2011, 03:59 PM Thread Starter
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Yea, a link to cheaper rotors would be awesome... $320 is too much for me right now. As far as a shop not resurfacing them because of safety concerns... I live in Mexico!! What safety concerns? lol.

Anyway, I try not to do things like most Mexican mechanics and try to do things right, so that's why I was asking about resurfacing them. I haven't really taken a good look to see if they are glazed, but since it's an 85 and it sat for like a year before the previous owner got it and neglected it, it can't hurt to ask if I can sand them to remove any rust or glazing or whatever I find lol
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post #7 of 11 (permalink) Old 03-20-2011, 02:59 PM
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The brake pads will scrubb off any light surface rust with a few good applications of the brakes.

There are several rotors for sale on ebay right now.
http://motors.shop.ebay.com/i.html?_...506.m270.l1313

Contact the seller to measure the thickness to determine how much wear there is left.

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post #8 of 11 (permalink) Old 03-20-2011, 03:05 PM
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X2 for Old Hoss. If they are not warped or deeply scored, put those babies back on and ride! Just be sure those initial brake appllications are gentle!
Bronson

2005 VN 750
MF Battery
Plexistar windshield
.040 pilot jets.
Splines lubed 1955 mi.
Marbled
Iridium plugs
Reset pickup coil gaps.
Metzeler ME=880s
Shindengen MOSFET RR
V & H Cruzers
Degoated
Speed bleeders
MCCTs.
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post #9 of 11 (permalink) Old 03-20-2011, 05:41 PM Thread Starter
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Cool, thanks for the info guys!

I did look at the rotors on ebay, but I was asking to see if they could be found new but not so expensive...
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post #10 of 11 (permalink) Old 03-20-2011, 07:19 PM
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I machined mine on a brake lathe we only use carbide lathe bits. it actually peels the rotor in long strands that are razor sharp. So be careful if you do


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