trailie Posted May 7, 2014 Report Share Posted May 7, 2014 Does anyone know how these pins come out? I was going to make new ones from stainless steel. I thought at first they would just unscrew but they wont. Now I'm thinking they might be pressed in on a spline like a wheel stud is pressed into a car hub. Any ideas? Quote Link to comment Share on other sites More sharing options...
dadof2 Posted May 7, 2014 Report Share Posted May 7, 2014 On some hubs these are cast in. I would be reluctant to replace them unless absolutely necessary. Any subsequent failure, particularly on the front brake could result in a disastrous unexpected front wheel lock up. Quote Link to comment Share on other sites More sharing options...
zerorev3rev4 Posted May 7, 2014 Report Share Posted May 7, 2014 On some hubs these are cast in. I would be reluctant to replace them unless absolutely necessary. Any subsequent failure, particularly on the front brake could result in a disastrous unexpected front wheel lock up. yes i had that very thing about 30 40 mph on tarmac not nice ,someone had cross threaded brake plate stay mount ,bolt came out plate spun round brake locked on sending me sliding down the road , the hub was smashed and the wheel hub , so quite expensive parts ruined aswell Quote Link to comment Share on other sites More sharing options...
trialsrfun Posted May 8, 2014 Report Share Posted May 8, 2014 As above, leave well alone. The pivots while looking to be a little pitted should not affect brake performance at all, just smear them with grease when assembling the brakes they will work just fine. 1 Quote Link to comment Share on other sites More sharing options...
trailie Posted May 8, 2014 Author Report Share Posted May 8, 2014 (edited) I don't think that they're cast in, that's unlikely. They are in the parts book with a part number so they must be a replaceable item. I'll try pressing one to see if it's splined. But you're right, they would do ok as they are. www.ralphsbultaco.blogspot.com Edited May 8, 2014 by trailie Quote Link to comment Share on other sites More sharing options...
sherpa325 Posted May 8, 2014 Report Share Posted May 8, 2014 Definitely not cast in position, they are just a neat push fit in Bultacos,however there is no real need to remove them as they can be cleaned up in position. Cheers Greg Quote Link to comment Share on other sites More sharing options...
pschrauber Posted May 8, 2014 Report Share Posted May 8, 2014 The pins can have some cranny corrosion which have "glued" them to the cast aluminum. If you try to pull them out you might damage the aluminum holes. If you can't resist pulling them out heat up the aluminum anchor plate, aluminum expands at least three times more then steel. As they work as counter and pivot bearing I would just clean them from any debris and lap them with fine grinding line. A little bit of copper paste and they should work again. Quote Link to comment Share on other sites More sharing options...
nigel dabster Posted May 8, 2014 Report Share Posted May 8, 2014 If you are bothered about this have you bushed the pivot other side?, thats far more important 1 Quote Link to comment Share on other sites More sharing options...
trailie Posted May 8, 2014 Author Report Share Posted May 8, 2014 (edited) Hi folks, here's the answer. They press out - no splines or anything - dead simple. I'm gonna make nice new ones out of stainless. Yes Nigel, you're right, the pivot cam wears into the backplate, if you look up at the top photo you can just see a bit of a brass bush I put in there at one time for that very reason. But I'm not finished yet. I'm thinking also that I might skim out the brake liner, then make and fit a new one. Has anyone done that job. http://www.ralphsbultaco.blogspot.co.uk Edited May 8, 2014 by trailie Quote Link to comment Share on other sites More sharing options...
trailie Posted May 12, 2014 Author Report Share Posted May 12, 2014 I've made the pins in A4 stainless, although I had to buy a piece of material as the only stuff I have is inch and a half and I didn't fancy turning it down that far. Perhaps the best pins you will NEVER SEE !! 4 Quote Link to comment Share on other sites More sharing options...
rlk_76 Posted May 15, 2014 Report Share Posted May 15, 2014 I just opened up my brakes after 30 years in the dark. Hard to get them out, but once out I just took a wire wheel to them. Hopefully they'll work ok. Yours look much better. Good work! 1 Quote Link to comment Share on other sites More sharing options...
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