Guest Paget76 Posted January 22, 2019 Share Posted January 22, 2019 Hmmm, just found a note in the service manual saying that you need to alternate bleeding front then back 3 or 4 times after they run clear! Guess I'll be spending a fun hour tonight... Link to post
trisaki 2,029 Posted January 22, 2019 Share Posted January 22, 2019 Cant say I have ever had a problem , you just seem to be lucky ! Dont undo the nipples too far and keep the level up 1 Link to post
DaveM59 1,605 Posted January 22, 2019 Share Posted January 22, 2019 (edited) The air inside either front or rear pipes affects the efficiency of pumping whichever bleed nipple you have open as it compresses, so you have to keep swapping until absolutely certain you have got rid of all the air from both lines. I would actually open the bleed nipples wide so evacuation is easier than compressing any air in the other part of the linked system. Slightly different approach. Edited January 22, 2019 by DaveM59 Link to post
embee 7,288 Posted January 22, 2019 Share Posted January 22, 2019 Do you use a vac type bleeder? Link to post
Guest Paget76 Posted January 22, 2019 Share Posted January 22, 2019 3 minutes ago, embee said: Do you use a vac type bleeder? No, just the old-fashioned method. Shouldn't make a difference, though, other than speed (and a sore arm)? Link to post
embee 7,288 Posted January 22, 2019 Share Posted January 22, 2019 (edited) Hmmm. Nothing wrong with the old fashioned method but it doesn't work properly afterwards. OK. Edited January 22, 2019 by embee Link to post
Guest Paget76 Posted January 22, 2019 Share Posted January 22, 2019 Out of interest, anyone got a good method of knowing when your have pumped a pipe-ful of fluid? Ie. how long to bleed at each end? Link to post
DaveM59 1,605 Posted January 22, 2019 Share Posted January 22, 2019 When the outgoing fluid is as clean as what you are topping the reservoir up with, then do another reservoir full. Then swap to the other end and do the same. Repeat. Link to post
Guest Paget76 Posted January 23, 2019 Share Posted January 23, 2019 OK, bled back and then front twice more (2 reservoirs-full each go), which does seem to have done the trick, although no visible air in the fluid. Strange system... Link to post
DaveM59 1,605 Posted January 23, 2019 Share Posted January 23, 2019 Good. I know some owners use a technique where they use a strong rubber band to keep the brake lever(s) squeezed all night and say it lets air rise up and out over time. I can't quite see how this works although the theory that air rises to the top is fine, there are valves and pistons in the way, but they do claim it works. 2 Link to post
Guest Paget76 Posted January 23, 2019 Share Posted January 23, 2019 2 hours ago, DaveM59 said: Good. I know some owners use a technique where they use a strong rubber band to keep the brake lever(s) squeezed all night and say it lets air rise up and out over time. I can't quite see how this works although the theory that air rises to the top is fine, there are valves and pistons in the way, but they do claim it works. That seems rather odd, but worth a try! Link to post
Tex 36,817 Posted January 23, 2019 Share Posted January 23, 2019 3 hours ago, DaveM59 said: Good. I know some owners use a technique where they use a strong rubber band to keep the brake lever(s) squeezed all night and say it lets air rise up and out over time. I can't quite see how this works although the theory that air rises to the top is fine, there are valves and pistons in the way, but they do claim it works. I have been doing that since I first tried it (in desperation) on a Trident In 1977. It worked then and it works now. All our race bikes are ‘finished off’ that way (after the traditional bleeding process). How does it work? Dunno, above my pay grade that one! 1 Link to post
Guest Paget76 Posted January 23, 2019 Share Posted January 23, 2019 13 minutes ago, Tex said: I have been doing that since I first tried it (in desperation) on a Trident In 1977. It worked then and it works now. All our race bikes are ‘finished off’ that way (after the traditional bleeding process). How does it work? Dunno, above my pay grade that one! Presumably a weight on the pedal overnight would acheive the desired result? Link to post
Tex 36,817 Posted January 23, 2019 Share Posted January 23, 2019 15 minutes ago, Paget76 said: Presumably a weight on the pedal overnight would acheive the desired result? Indeed. The front brake lever is just secured to the twist grip with a rubber band and a decent sized (at least a kg) weight hung from the rear pedal with a cable tie. Go and have a good night’s sleep and let the brake fairies work their magic. Don’t forget to thank them in the morning.. 1 Link to post
Graham NZ 1,186 Posted January 23, 2019 Share Posted January 23, 2019 +1 to letting the final-bleeding fairies do their bleeding-best. Link to post
Guest Paget76 Posted January 28, 2019 Share Posted January 28, 2019 Well, left it over the weekend with a weight on the pedal, and indeed the fairies do seem to have visited! Still not as responsive as I'd like, but a definite improvement! Thanks again to everyone for the help and suggestions Link to post
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