Tez162003 Posted July 28, 2008 Share Posted July 28, 2008 right, i got a rear disk beam which i am painting re furbing and fitting asap, but there's a problem, as i screwed in the bleed nipple it cross threaded, so now an almost useless caliper, well half a caliper, annoying thing is it looks like this one was re con'd not long ago as the pistons and seals are intact! so anyway, i got a new bigger bleed nipple to use, (m8 size), and got the misses bro to take it to work and drill and tap it, but the problem is, the tip of the bleed nipple which is tappered now doesnt sit flush, thus meaning it is just gunna pee fluid out, so what im asking is, Any ideas on what to do next. and PLEASE, does anyone have or know of where i can get a passenger side rear RS2000 brake caliper. PLEEEEEEEEASE? Link to comment Share on other sites More sharing options...
onehotminute_191 Posted July 28, 2008 Share Posted July 28, 2008 have you posted this in wanted?? also, are you sure it was the caliper that was cross threaded? the bleed nipple is made of brass and the caliper is cast iron. cast iron vs brass. brass will always lose. instead of getting a new caliper, put the bleed nipple on a lathe and cut the edge to the same angle as the drill bit that was used to drill the hole. lol i no it seems like alot of hassle but it'll sort it out. and if you do it wrong bleed nipple cost pence and caliper cost lots. dont try and shape it by hand though. it'll never work unless your a magician. lathe will cut it perfect (depending on the angle your cutting). 120 degrees i think it might be. Link to comment Share on other sites More sharing options...
SaMMy125 Posted July 28, 2008 Share Posted July 28, 2008 (edited) yo tez i cant find any calipers in the garage think iv thrown em , prob be able to drill into the hole and make a tapped bit in the caliper or chop the bleed nipple down Edited July 28, 2008 by SaMMy125 Link to comment Share on other sites More sharing options...
Tez162003 Posted July 29, 2008 Author Share Posted July 29, 2008 yo tez i cant find any calipers in the garage think iv thrown em , prob be able to drill into the hole and make a tapped bit in the caliper or chop the bleed nipple down chop the bleed nipple down? does it not need to be tappered then, i know the fluid goes out the little hole slightly further up (just before the thread starts) SO WHAT DOES THE TAPPERED BIT IN EFFECT DO? ooops caps! lol damn sammy, i was hoping you'd have one, after seeing how much stuff you have lying around! you should do a ford fair jumble sale! lol have you posted this in wanted?? also, are you sure it was the caliper that was cross threaded? the bleed nipple is made of brass and the caliper is cast iron. cast iron vs brass. brass will always lose. instead of getting a new caliper, put the bleed nipple on a lathe and cut the edge to the same angle as the drill bit that was used to drill the hole. lol i no it seems like alot of hassle but it'll sort it out. and if you do it wrong bleed nipple cost pence and caliper cost lots. dont try and shape it by hand though. it'll never work unless your a magician. lathe will cut it perfect (depending on the angle your cutting). 120 degrees i think it might be. nope it was definately the caliper, the bleed nipple was fine, caliper was shredded! lol its now re tapped anyway, so the m8 nipple screws in, but that tip is to big, my initial thought was to grind down the tip by machine, but i doubt it will ever be perfect, and what i want to know is what does the tip do? the fluid comes out tiny hole further up the nipple. be so much easier to get a new caliper, but finding just a caliper is hard enough too! i have 2 beams etc, just 1.5 calipers! lol Link to comment Share on other sites More sharing options...
onehotminute_191 Posted July 29, 2008 Share Posted July 29, 2008 (edited) if you look at the bleed nipple as far as i remember the hole runs down the centre and stops before the end that goes into the caliper and then the hole comes out the side. basically when you screen the nipple down the bottom presses against the caliper so fluid cant pass round the side and through the hole. say the angle inside the caliper right at the bottom is 120degress, if you cut the end of the nipple so the angle is 100degress it\\\\\\\'ll be more of a point and it will push into the hole in the caliper and seal. the reason the nipple is brass is because its softer then the caliper and will change shape slightly to get a tight fit. ideally you want the angle on the nipple near enough exaclty the same to get a wider surface area of pressure. http://www.evo-host.co.uk/getimg/14133.bmp in that pic the red line shows the hole that goes through the bleed nipple. se how the angle on the nipple is sharper than on the caliper at the bottom of the hole. as the nipple screws down it will in theory plug the hole and no fluid will pass. try shaping the end of the nipple at a sharper angle and have another go. i dont understand why this picture wont show up can anyone sort that pic out?? Edited July 29, 2008 by onehotminute_191 Link to comment Share on other sites More sharing options...
Tez162003 Posted July 29, 2008 Author Share Posted July 29, 2008 if you look at the bleed nipple as far as i remember the hole runs down the centre and stops before the end that goes into the caliper and then the hole comes out the side. basically when you screen the nipple down the bottom presses against the caliper so fluid cant pass round the side and through the hole. say the angle inside the caliper right at the bottom is 120degress, if you cut the end of the nipple so the angle is 100degress it\'ll be more of a point and it will push into the hole in the caliper and seal. the reason the nipple is brass is because its softer then the caliper and will change shape slightly to get a tight fit. ideally you want the angle on the nipple near enough exaclty the same to get a wider surface area of pressure. <img src='http://www.evo-host.co.uk/getimg/14133.bmp' alt='Hosted at Evo-Host.co.uk'> in that pic the red lin shows the hole that goes through the bleed nipple. se how the angle on the nipple is sharper than on the caliper at the bottom of the hole. as the nipple screws down it will in theory plug the hole and no fluid will pass. try shaping the end of the nipple at a sharper angle and have another go. i dont understand why this picture wont show up i understand exactly what you mean, i will be getting the misses bro too try drill the hole out in the caliper, but i may be getting a couple more screws, so can possibly shape them first, i cant see your picture by the way Link to comment Share on other sites More sharing options...
onehotminute_191 Posted July 29, 2008 Share Posted July 29, 2008 i know i dont know why it wont show. pm me an email address if you want it. its just a visual representation of everything i just said lol make it easy to read and see what im talking about. dont re drill the nipples hole again. otherwise you risk ruining the thread in there, then you'll have to use an m10 nipple which i dont know if you can even get. just make sure the thread and the base of the hole in the caliper is clean and theres no swarf or other crap in there. blow it through with a compressor, then cut the angle on the nipple using a lathe. trust me, if you make a mistake you can just try another nipple. you dont want to ruin the caliper as by the sound of it its still usable. also another reason not the redrill it is because that hole needs to be perfectly in the centre otherwise your bleed nipple will be useless. saying that now that the thread has been redrilled that could have put the threaded hole and the centre of the hole going through the caliper out of line. meaning your caliper is useless until theyre centred lol. thats why these jobs are normally done on a mill or bench drill with the caliper locked in place. one other suggestion if you have no luck with this or finding another caliper. weld hole completely back up and redrill the whole lot with the caliper locked so everything is centred. but that only if you really fcuk up lol Link to comment Share on other sites More sharing options...
SaMMy125 Posted July 29, 2008 Share Posted July 29, 2008 noobs http://i56.photobucket.com/albums/g186/crashandburn125/14133.jpg Link to comment Share on other sites More sharing options...
onehotminute_191 Posted July 29, 2008 Share Posted July 29, 2008 man what did i do wrong. i did everything as i normally do it. lol Link to comment Share on other sites More sharing options...
SaMMy125 Posted July 29, 2008 Share Posted July 29, 2008 man what did i do wrong. i did everything as i normally do it. lol bitmap mate, your right about the bleed nipple its not seated correctly, lathe the nipple is the best bet, would not try to drill a weld its a total pain Link to comment Share on other sites More sharing options...
onehotminute_191 Posted July 29, 2008 Share Posted July 29, 2008 man what did i do wrong. i did everything as i normally do it. lol bitmap mate, your right about the bleed nipple its not seated correctly, lathe the nipple is the best bet, would not try to drill a weld its a total pain true but that nipple is specifically placed there at the very top. if the thread or hole gets too knackered thats the only option. otherwise new caliper. shame about it being cross threaded in the first place. someone must have tried using a steel bolt to do it up lol Link to comment Share on other sites More sharing options...
neil73 Posted July 29, 2008 Share Posted July 29, 2008 i think i have a pair of calipers, they are in my brothers workshop but knowing him hes probably chucked them out. he's back at work tomorrow so will go and see if hes still got them so cross everything, lol Link to comment Share on other sites More sharing options...
neil73 Posted July 30, 2008 Share Posted July 30, 2008 i think i have a pair of calipers, they are in my brothers workshop but knowing him hes probably chucked them out. he's back at work tomorrow so will go and see if hes still got them so cross everything, lol had a look today and they havent turned up will try and get down for another look Link to comment Share on other sites More sharing options...
Tez162003 Posted July 30, 2008 Author Share Posted July 30, 2008 keep looking mate! thanks hope they turn up incase this caliper doesnt work, plan is yes to lathe the end of the nipple to have the same diameter as the old nipple, the angle of the tip is the same. so hopefully that works! lol Link to comment Share on other sites More sharing options...
neil73 Posted August 2, 2008 Share Posted August 2, 2008 keep looking mate! thanks hope they turn up incase this caliper doesnt work, plan is yes to lathe the end of the nipple to have the same diameter as the old nipple, the angle of the tip is the same. so hopefully that works! lol sorry matey cant find them, had to take just about every thing out of a 20 foot container, took ages but they are not there. sorry Link to comment Share on other sites More sharing options...
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