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Topic-icon Front Break Rotor Bolts Sitting Proud and Hitting Caliper?

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4 weeks 2 days ago #5232 by mjmorrisva
Friends,

Let me be clear...before I post I always search thoroughly for threads on the topic I'm requesting help with. I use the custom search feature and try several methods to get what I need. Only when I cant find answers in the old threads do I post here. Thank you in advance for your help. Its been invaluable as I take this journey (loving every minute of it).

Now for your thoughts....I removed the front wheel of my 82 R100RT. In the process I found the front break rotors have bolts holding it together (not the bolts attaching the rotor to the wheel) see pics. The bolts are sitting ever so proud and contacting the calipers (creating small but very fresh gash in the caliper) see pic. This is happening on both sides (both rotors). Its almost like someone put the rotor together with the wrong size (length) bolts. The rear break rotor looks like it has different bolts which are rounded off smooth in order to not come in contact with the caliper.

Does anyone have any experience with this problem? Is this typical of an 82 airhead?

Thoughts?

1982 R100RT

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4 weeks 1 day ago #5241 by Wobbly
Sorry to see that.

Your issue is that nuts and bolts are NOT supposed to be there. What you're supposed to have is low profile rivets. It is obvious that someone drilled out the rivets in order to machine the rotors or do some type of rotor service.

I would highly advise you look at a new set of rotors, and the third party rotors from EBC stop better and are several big bills less expensive than the ones from BMW.

Hope this helps.

Don't hide 'em, Ride 'em !!
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4 weeks 1 day ago #5242 by mjmorrisva
Yes, that certainly does help sir, thank you. I figured something was amiss. It makes sense......someone was trying to "fix" the break jolting bar wobble problem I posted about before and failed miserably.

New rotors and rebuild the calipers (going to do that anyway) are in order.

M

1982 R100RT

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4 weeks 1 day ago #5245 by Wobbly
Warped rotors are/were a common issue.

As a total aside, my own feeling is that the issue is not due to poor design or materials, but due to failure of the black, flexible OEM brake hoses. They fail quietly, without making any signs, other than to make the brake pads drag (and thereby over-heat) the rotors. I must have replaced 50 of these hoses in the last 10 years (and I'm just a part-time mechanic).... Honda, Norton, Triumph, BMW it's endemic across all brands.

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4 weeks 1 day ago #5248 by mjmorrisva
Considering that learned experience, what brand break lines do you recommend?

Cheers,
M

1982 R100RT

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4 weeks 11 hours ago - 4 weeks 11 hours ago #5252 by Wobbly
There are literally hundreds of brake line makers using the PTFE ("Teflon") internal hose surrounded by stainless steel braid, with or without an exterior vinyl coating. These are generally known in the biz as "stainless steel" lines or hoses, but it's the internal Teflon hose that's really the prime asset.

The most prominent maker is Speigler. Bob's BMW makes their own. If you want to design your own, then there are lots of hot rod car vendors, like Summit selling pre-made and DIY lines.

spieglerusa.com/brakes.html

If you want to look stock, then get the Black exterior coating. Sometimes the Clear looks good on customs. Or you can get Blue and other exterior colors. However, the Plain, un-cloated lines will eat up a plastic fairing in no time.

You will be wary of the price of these lines... until the first time you apply the brakes. These lines increase the breaking efficiency tremendously. You'll feel like your stopping power doubled. Then you'll be kicking your own rear end for not making this change 20 years ago. :P

Don't hide 'em, Ride 'em !!
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Last edit: 4 weeks 11 hours ago by Wobbly.

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