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Brake cylinders

1111 Views 9 Replies 6 Participants Last post by  JWink, 
showmedude
Attached is a picture of one half of my GL650-#2 brake calipers. The front brakes were the most obvious thing wrong with the bike when I picked it up 2 weeks ago, and I'm wondering if this was a contributor. It appears to me, unencumbered by knowledge, that the back end of the cylinders have worn through to a mesh-like support area. Since I've never seen the inside of a Honda caliper, I'm not sure how normal this is. I don't know why there would be friction-type wearing there, but maybe after 70K miles that is what happens. All four cylinders have similar patterns. On a maybe-related note, one cylinder had the pile of goo seen in the other pic by the fluid holes in the back end. It has the consistency and color of moly grease.



The o-rings and pistons look OK, but the dust seals are just about kaput. Should I spend any more time cleaning and rebuilding these calipers?



http://s814.photobucket.com/albums/zz62/dhuhman/?action=view&current=650Brakecylinders.jpg



http://s814.photobucket.com/albums/zz62/dhuhman/?action=view&current=Brakecylindergunk.jpg



(I got a "Can't use a .jpg image type" error when posting this. Has something changed? Took out the image code, so maybe someone can fix it.)
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Blue Fox
If you use the Dremel, don't overdo it. Try to use a brass brush and just make a quick turn or two around the circumference. You don't want to round the edges of the groove too much.



I wonder if the gunk you found is actually grease? I know of several references on the old site about how to get a grease gun on those Zerk fittings. Maybe a PO actually did it! If he would have opened the valve a little, you could certainly pump some in.
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Blue Fox
One of the posts was inquiring as to the purpose of the Zerk on the caliper. We have to remember the level of experience among the members vary from the expert to the very naive. I'll bet there have been more than one who have tried to grease the bleed valve.



On another note, Happy Birthday, Showmedude. I would have posted this on the Off Topic section, but it is getting crowded in there.
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