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Discussion Starter · #1 ·
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I did a master cylinder rebuild this past winter and front brake system seemed to be fine but all of a sudden ( 90+ degree heat days) they seem to build pressure and almost lock up the front wheel.If you open the bleeders you get a little squirtand they release.After it cools in evening or the next day they seem fine again till the afternoon heat. Used dot 4 fluid, all new seals, new Stainless brake lines,---everything was clean. I'm stumped???
 

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just curious. when you rebuilt the master cylinder did you pry off the plastic reservoir. JB
 

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Sounds like the little hole in the master cylinder is blocked. There are two holes in the master cylinder, one is easy to see the other not so. It is the small one that allows the fluid to return to the reservior.
 

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Discussion Starter · #4 ·
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I did pry off the master cylinder and replaced the o-ring. I only saw one small hole???? You say there are two??
 

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Discussion Starter · #5 ·
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I did pry off the master cylinder and replaced the o-ring. I only saw one small hole???? You say there are two??
 

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yes there are 2. I have a customers 82 in the shop for the same reason. He rebuilt it but the small hole was rusted closed. Clean out the little divet and there should be a hole there. Be careful because once cleared it can it can spray ya in the faceCover your bike completely. JB
 

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Discussion Starter · #7 ·
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Can you give me any idea where the second return hole is located? Do I need to remove just the reservior or do I need to dis-assemble the master cylinder again?
 

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just take off the plastic reservoir. you will see the big feed hole towards the rear. forward of that is a divet. the hole is centered in the divet but you might need a magnifying glass to see where its at. I carefully use a #80 drill bitwhich is probably a little smaller than a hair. jb
 

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I've seen many posts concerning the elusive hole... can anyone post a picture of the little devil??
 

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I think somebody did a while back. It really aint hard to locate. Take off the plastic reservoir and clean the insides real well. . I cover the bike and use brake clean and then compressed air. There is a what I call a divit. It looks like someone started to drill a 1/4 inch holebut stopped. In the very center of the divetthats where the hole is or should be. JB
 

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Discussion Starter · #11 ·
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I think I may have fixed the problem. I removed reservoir and cleaned with alcohol. Ran a 1/64 " drill thru hole--carefully--- added new fluid and bleed system. We will see!!
 
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