15-11-2014, 10:54 AM
(This post was last modified: 15-11-2014, 11:07 AM by pug306driver.)
brake fluid absorbs water from the atmosphere ( does modern dot 5 stuff do that as well???? ) etc........
gravity ( with m/c cap off ) could be used for a very basic bleed, when fluid and no air emerges from the nipple then its time to bleed properly......
get an assistant that will do exactly as you say as you will be the one in "command" at the nipple.
follow the procedure for which nipple to bleed first etc...........
with all nipples showing air free fluid flow via gravity method, and with all nipples closed, start at the nipple furthest away from the m/c.......
get the assistant to "pump up" the brakes with say five firm presses of the pedal ( the "pump up command" ) in quick succession with them taking the foot off the pedal each time so the system can pressurize and fill etc........then press the pedal ( the down command ) down and keep pressing ( not over the top and trying to burst a pipe etc ) which is the "down command"......then the assistant says "down".........so you know what they are doing!!......at this point open the nipple gently and watch the fluid emerge from the nipple, go thru a clear plastic pipe and into a 1/4 filled jam jar or similar of fluid.........
the assistant will notice the pedal go down to the floor.......he must keep it there while you nip up that nipple.
you say the "up" command and the ass complies......wait for the m/c to take a new mouthful of fluid and repeat process.
take you time and communicate with each other else you will have to start again. remember you are in command.
did the fluid level in the m/c res rise when you pushed the caliper pistons in?? and where they stiff or go back in with thumb ( if not heavy ) pressure with the res cap off??
there is a very small ( tiny ) hole in the m/c bores to the res for "recouperation" or return of fluid when the brakes are released or get hot etc.....else they with drag and possible not release at all!! if that is blocked. if it is blocked then bleeding can be problematic.
ps never let the m/c res fluid level drop too much else you will pump air etc!!!!!!
pps a syringe full of new clean fluid can be used to "wash" the black crap on the m/c res floor and suck that out, rather than have all that crap be pumped thru the system..........also leave time for an "airation" or tiny tiny air bubbles in the res fluid to rise and pop else you will pump that thru the system as well !! or buy a pressure bleeder.....and do it single handed.
gravity ( with m/c cap off ) could be used for a very basic bleed, when fluid and no air emerges from the nipple then its time to bleed properly......
get an assistant that will do exactly as you say as you will be the one in "command" at the nipple.
follow the procedure for which nipple to bleed first etc...........
with all nipples showing air free fluid flow via gravity method, and with all nipples closed, start at the nipple furthest away from the m/c.......
get the assistant to "pump up" the brakes with say five firm presses of the pedal ( the "pump up command" ) in quick succession with them taking the foot off the pedal each time so the system can pressurize and fill etc........then press the pedal ( the down command ) down and keep pressing ( not over the top and trying to burst a pipe etc ) which is the "down command"......then the assistant says "down".........so you know what they are doing!!......at this point open the nipple gently and watch the fluid emerge from the nipple, go thru a clear plastic pipe and into a 1/4 filled jam jar or similar of fluid.........
the assistant will notice the pedal go down to the floor.......he must keep it there while you nip up that nipple.
you say the "up" command and the ass complies......wait for the m/c to take a new mouthful of fluid and repeat process.
take you time and communicate with each other else you will have to start again. remember you are in command.
did the fluid level in the m/c res rise when you pushed the caliper pistons in?? and where they stiff or go back in with thumb ( if not heavy ) pressure with the res cap off??
there is a very small ( tiny ) hole in the m/c bores to the res for "recouperation" or return of fluid when the brakes are released or get hot etc.....else they with drag and possible not release at all!! if that is blocked. if it is blocked then bleeding can be problematic.
ps never let the m/c res fluid level drop too much else you will pump air etc!!!!!!
pps a syringe full of new clean fluid can be used to "wash" the black crap on the m/c res floor and suck that out, rather than have all that crap be pumped thru the system..........also leave time for an "airation" or tiny tiny air bubbles in the res fluid to rise and pop else you will pump that thru the system as well !! or buy a pressure bleeder.....and do it single handed.