stevieh Posted February 26, 2009 Share Posted February 26, 2009 Help! While bleeding my front brakes a piston popped out and fluid went everywhere, leaving little or nothing to bleed and air in the system. After getting the piston back in place (and clamping it!) I filled the reservoir again but squeezing the lever doesn't seem to pump fluid through now. Am I missing something? Do I have to syphon it through somehow? Steve Link to comment Share on other sites More sharing options...
Moderator mervin Posted February 26, 2009 Moderator Share Posted February 26, 2009 easiest method i have found and this is the way i go every time now, is too get a piece of pipe and a large syringe and push the fluid back up from the caliper first Merv Link to comment Share on other sites More sharing options...
Moderator drewpy Posted February 26, 2009 Moderator Share Posted February 26, 2009 Chris Pearson (writebike) used to put a pipe from the caliper nipple into the brake resevoir using wire to secure and then press the lever with the nipple slack and before realsing it tighten up the nipple. eventually you get a fluid circuit and you can see it sometimes just going back and forwards within the tube if you dont do the nipple trick. One last thing is to leave the lever pressed via a cable tie overnight to purge any errant air. drewps Link to comment Share on other sites More sharing options...
Moderator mervin Posted February 26, 2009 Moderator Share Posted February 26, 2009 Takes a bloody long time doing it that way Drewps. i usually want to ride the bike, merv Link to comment Share on other sites More sharing options...
Moderator YamaHead Posted February 26, 2009 Moderator Share Posted February 26, 2009 One last thing is to leave the lever pressed via a cable tie overnight to purge any errant air. Good point......was key in me getting my RD's front brake bled properly. Link to comment Share on other sites More sharing options...
barkwindjammer Posted February 26, 2009 Share Posted February 26, 2009 Takes a bloody long time doing it that way Drewps. i usually want to ride the bike, merv how would you do it then Merv you old , ? Link to comment Share on other sites More sharing options...
Moderator mervin Posted February 26, 2009 Moderator Share Posted February 26, 2009 the way i said at the top syringe full of brake fluid push the fluid back up the pipe, reverse bleed i am told it is called. taught to me by a scania mechanic only way too bleed a scania clutch system, just be very careful you do not overfil the mastercylinder this way, always wipe any spilt fluid off immediately. i always hose the bike down after doing any work involving brake fluid merv Link to comment Share on other sites More sharing options...
windard123 Posted February 26, 2009 Share Posted February 26, 2009 When bleeding a completely dry system ive always let gravity feed it, if you just fill the resevoir and open the bleed nipples, just make sure you have a tube on the end so it doesnt just poor everywhere when it gets to the nipple! Link to comment Share on other sites More sharing options...
stevieh Posted February 26, 2009 Author Share Posted February 26, 2009 Thanks gents. I'll try gravity first then look for a syringe. (Sounds like a line from a film!) Link to comment Share on other sites More sharing options...
Moderator mervin Posted February 26, 2009 Moderator Share Posted February 26, 2009 Agricultural supply merchant is where i get mine merv Link to comment Share on other sites More sharing options...
Moderator drewpy Posted February 26, 2009 Moderator Share Posted February 26, 2009 to get it started , you can always suck on a clear pipe from the nipple till you see fluid emerging. (said the biship to the actress ) Link to comment Share on other sites More sharing options...
wildone Posted February 26, 2009 Share Posted February 26, 2009 The best way when the system has been really empty is to fill it up from the bottom --- Using a clean (in my case "dedicated" / used for nowt else) thumb pressure oil can full of brake fluid and conect it to the bleed nipple with a very short rubber bleed pipe. ( I use smal cable ties too to ensure and maintain the seal at both the nipple and the oil-can) Remove the resevoir cap Open the nipple and pump the system full of fluid --- this automatically bleeds - out MOST of the air too first time. Hold the brake lever slightly opened / pulled with a.n.other tie (or even a piece of string) When filled close nipple The advice from the previous member about cleaning off any spillages is still good practice but modern / new fluid is not the very corrosive stuff that it was but it will still knack your brake linings / pads permanently Link to comment Share on other sites More sharing options...
nio Posted February 27, 2009 Share Posted February 27, 2009 Just pour in the reservoir some oil having the callipers nipple open. Keep pouring oil for a few seconds after you see the oil coming out of the nipple. Then (having in mind for the reservoir not to be empty ) do the nipple right so there's no oil dripping. This way the downgoing fluid will take out all the air (OK, you "loose" some quantity of brake oil). Take care for the brake fluid not to drip on the wheel (put a small pipe on the nipple or a piece of nylon underneeth the calliper covering the wheel). Easier with two helping hands. No more than 2-3 minutes. Link to comment Share on other sites More sharing options...
Recommended Posts