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motoyoyo's Avatar
 
Join Date: Aug 2002
Location: Camarillo, CA
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Question Brake Rotor Mounting

I have a question on the brake rotor mounting hardware. My bike is an early '99 and the rotor mount roll pins, wave washers and philster bolts have always been rusted and look like krap. Before I mount wavey rotors I would like to get new mounting hardware. Do the newer bikes have better finishes on these parts or are there other options available?

Also the parts fiche shows the philster bolts as an M8x25-10.9 ZNS. I'm not familiar with the "-10.9 ZNS" callout. Is this a shoulder or thread height and zinc finish? I'm just wondering if I could replace the bolts with a standard stainless philster head tork M8x25mm to avoid the rust or is the stock bolt required because of a shoulder or thread height? All four pieces for the front rotors (2,4,3,5) are shown as the same for all bikes regardless of year or ABS.


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Scott

'98 R1100S - Triple Clamps, 10mm Shortened Telelever
2007 S2R1000
Old 01-18-2006, 01:55 PM
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'10.9' refers to the hardness/toughness, as in 'grade 8'.
I'd figfure out what the xperts say about this critical piece. I powdercoated mine as I hated the krappy finish also. I'm going to yank the wave washers in the interest of reduced friction, and besides, it'll sound so.....*ducatish* that way
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Injection is nice but I'd rather be blown
bottles are not just for babies.....
1999 R1100S;1999 KTM 380EXC street-legal motard
WASCO-framed XR883 (ex Natl#25 Todd Bowne's)
Old 01-18-2006, 02:14 PM
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Thanks Jony, that makes sense. Better stick with the stockers then. Last time I changed my front tire I wire wheeled the bolts and roll pins and clear coated them with some polyurethane. Still looks good after several months but probably won't last too much longer. Powdercoat sounds like a long lasting solution.
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Scott

'98 R1100S - Triple Clamps, 10mm Shortened Telelever
2007 S2R1000
Old 01-18-2006, 02:33 PM
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IF you coat them, mask the threads
you can buy a whole hobbyist powdercaot setup from eastwood (minus surplus oven for baking) for like $150.00
one of the better shop tool investments I've made....you'll be amazed at what you end up coating and how good it looks with reasonable prep
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Better a has-been than a wanna-be
Injection is nice but I'd rather be blown
bottles are not just for babies.....
1999 R1100S;1999 KTM 380EXC street-legal motard
WASCO-framed XR883 (ex Natl#25 Todd Bowne's)
Old 01-18-2006, 02:37 PM
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Those wave washers are there for more than just looks but personally, I find the clunking of rotors from worn out spring washers to be annoying to say the least.
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Old 01-18-2006, 03:10 PM
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I called the local specialty bolt outfit here in SB and asked about the markings. The M8x25 is obvious. The 10.9, like JonyRR said, is the grade, metric, and corresponds roughly to a grade 8 bolt. It also indicates the type, hardened alloy(steel). The ZNS is up for grabs, but probably a zinc coating.

Here's the kicker. The guy I talked to seems to know his stuff, so I asked more about stainless steel and titanium. Stainless and titanium are graded under different systems and do not approach the strength of the hardened alloy bolts. I am starting to question the use of titanium, and even stainless steel, in applications where failures could cause catastrophic results. Axle hardware, brake parts and other suspension parts that were designed for hardened alloy for reliability. For instance, an 8mm hardened alloy (steel) might need to be replaced with a 10mm or 12mm stainless or titanium to give the same level of reliability. Has anyone looked at the shear and tensile strengths of the hardware that is being replaced by stainless or titanium? There are a lot of other variables here. If anyone has more info, or mine needs to be corrected, please post. We might be sacraficing a lot of safety for a couple ounces or pounds of weight.

Whadya think?
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Old 01-18-2006, 04:54 PM
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Ultimate tensile yield strength and shear strength of aircraft quality (6%Al, 4%V) titanium fasteners are equal to or greater than that for either carbon steel or hardened steel alloy or stainless steel. I understand that comparing the overall performance of two fastener alloys is much more complicated than that -- but its still reassuring rather than alarming.
Old 08-14-2010, 10:00 AM
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Moto, remove the bolts in question. Clean with acetone. Wire wheel the surface as best you can, and/or glass bead them if you have a blaster around the shop. Careful on the threads. Re acetone and let dry. Soak all bolts, (washers and spacers to if you wish) in gun blueing solution full strength. Let cure. Reinstall using one drop of blue lock tight on each bolt. Nice black/blue finish and touch.
Old 08-14-2010, 05:49 PM
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Wow, old post revival. I hope Moto is done (1/2006)
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07 Tuono R, seems to be a keeper.
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Old 08-14-2010, 06:40 PM
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Old 08-14-2010, 06:40 PM
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