nairn man Posted May 11, 2011 Report Share Posted May 11, 2011 im trying to find a bleed nipple which is m7x1.00, 33mm long i phoned a number of companies and they said length dont matter? i think it does thats why i havnt got 1 yet. i always thought the point (seat) on the nipple seals against the bottom of the caliper hole therefore seals the hole on the side. if length dont matter what happens if its too short? a bit like a sh**ging really come to think about it. if its too short it wont sit at the bottom. if its too long it should be ok. i was always led to believe the seat seals the threads dont. any thoughts. Link to comment Share on other sites More sharing options...
Pauljs Posted May 11, 2011 Report Share Posted May 11, 2011 go to http://www.brakesint.co.uk/ celica 182 rear nipples £1.42 each Link to comment Share on other sites More sharing options...
izzzzythedog Posted May 11, 2011 Report Share Posted May 11, 2011 it can be 5 inch long for all the difference it makes but as long as the seat is the same angle and it reaches long enough to seat correctly then its good Link to comment Share on other sites More sharing options...
Edd1Ninety9 Posted May 11, 2011 Report Share Posted May 11, 2011 Seat doesn't provide the seal, the threads do. You lock them with a compound or ptfe tape. All four of my bleed nipples on my Wilwood 4 pots have the seat protruding about 1mm and can see the red around the thread where excess compound is. HTH Link to comment Share on other sites More sharing options...
izzzzythedog Posted May 11, 2011 Report Share Posted May 11, 2011 (edited) ill be happy to be wrong about this http://www.nobody.org.uk/temp/acc_rear_brake_bleed_screw_new_vs_old.jpg the taper to the end has a seat it matches to , the thread just holds the beastie in place , on slacking off the fluid pushes past the seal and into the hole and out the top , the thread cant seal at all as well its a thread and thread such as this has a massive area so its not possible to seal Edited May 11, 2011 by izzzzythedog Link to comment Share on other sites More sharing options...
rpsmith79 Posted May 11, 2011 Report Share Posted May 11, 2011 Seat doesn't provide the seal, the threads do. You lock them with a compound or ptfe tape. All four of my bleed nipples on my Wilwood 4 pots have the seat protruding about 1mm and can see the red around the thread where excess compound is. HTH Nairnman means the seat at the end of the nipple, not the one where the Hex section is Another common misconception is that PTFE tape creates a seal, it does not, it only allows you to tighten the fitting tighter to create a better seal by reducing the friction on the threads, the tape does not create the seal As said, as long as they aren't too short the length doesn't really matter I think VW nipples fit as that is what i have fitted to my rear calipers Link to comment Share on other sites More sharing options...
Edd1Ninety9 Posted May 11, 2011 Report Share Posted May 11, 2011 Whoops. But yeah too long is better than too short! Long will work fine, short just won't reach. Link to comment Share on other sites More sharing options...
izzzzythedog Posted May 11, 2011 Report Share Posted May 11, 2011 being honest walk into a half reasonable spares shop and there a couple of quid over the counter Link to comment Share on other sites More sharing options...
Dorris Posted May 11, 2011 Report Share Posted May 11, 2011 To be honest in all my years I have never come across a bleed nipple that is to short, as long as the thread is the same it will seal providing the mating tapers are in good condition. You can get some nipples with a plastic coating on the threads this is to top both fluid seeping up or air being drawn down past the threads when bleeding. How many times have you or have you seen people bleeding brakes and have a constant stream of bubble coming up the bleed tube? This isn’t necessary air in the system but air being drawn in past the treads, normally caused by undoing the bleed nipple too much. Dorris Link to comment Share on other sites More sharing options...
izzzzythedog Posted May 11, 2011 Report Share Posted May 11, 2011 sort of on topic how are people bleeding there brakes , ive an easybleed and the bloody caps dont fit , are people using a kit or the old school shouting at your kids to pump and hold Link to comment Share on other sites More sharing options...
bazz54 Posted May 11, 2011 Report Share Posted May 11, 2011 sort of on topic how are people bleeding there brakes , ive an easybleed and the bloody caps dont fit , are people using a kit or the old school shouting at your kids to pump and hold I use a little plastic one-way valve costing ~£1.50 from an aquarium shop which then means it's just a one man job. I agree the real seal is on the tapered seat. The major benefit of PTFE tape on the threads of a brake nipple is that it stops them rusting solid. Link to comment Share on other sites More sharing options...
rpsmith79 Posted May 11, 2011 Report Share Posted May 11, 2011 sort of on topic how are people bleeding there brakes , ive an easybleed and the bloody caps dont fit , are people using a kit or the old school shouting at your kids to pump and hold You need to buy an adaptor to mount an easybleed to the none screw caps we have on our Celicas The way i do it is with a home made bleed bottle and a length of wood to keep the pedal pressed down Link to comment Share on other sites More sharing options...
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