I discovered that my clutch had no pressure from the clutch lever today.Took off the master cylinder top and it was full of fluid. Iput a vacuum pumpon the bleed valve, and pumped away. "WOW" almost no fluid came out.The level in the master cylinder did not drop.I put the top back on the master cylinder and pumped again, and as I suspected the pump would not hold pressure. Tomorrow Iwill disconnect the clutch lineat the slave cylinder, place the pump there and see if it holds pressure. This should tell me if I have a leak in the line. If the line holds pressure is there something going on with theslave cylinder? Also I have not seen any fluid on the floor from a leak.
dannyeod,unless you sealed the threaded portion of your bleeder screw the vacumn pump will not, as you say build pressure. Most times the pump will pull fluid and air pockects by helping the force of gravity BUT the system has to be air tight for it to create any vacumn pressure. The threads on the bleeder are not air tight most of the time or you could notturn them with your fingers after unseating with wrench. you can wrap just the threaded portion with teflon tape. Check the ports in the m/cyl for blockage from dirt,rust and gunk. The piston in the m/cyl. has to be fed with a flow of fluidbefore it will push anything. (yes there are two holes in the bottom of the reservoir) One feeds the piston and the other returns fluid to release pressure in the line(s).:waving:Keno
Thanks guys for your response. I cleaned and ran aclean bottle of fluid through the M/C and out the bleed valve last year. everything worked well afterward. I didn't give the M/C any thought, but I agree with you that I need to check that also. I didn't think of teflon tape around the bleed valve either. I will try both tomorrow. I know my pump can pull a vacuum because I've used it before.
funny i had a clutch problem just yesterday! did the pump thing, bleeded with the handle, let it drop by gravity but nothing worked! drained the whole thing and started over, still didnt work after 3 hours i decided to bleed the lever part on top opening the 14 milimeter bolt and the i bleeded the hose down to the bleeder on the bottom.... it finally worked and my clutch is working fine
Last weekend I bleed the brakes with a vacuum pump and it didn't work. Keno suggested teflon tape on the bleeder valve. After placing the teflon tape on the valve I bleed a whole can through the MC. No air bubbles after placing the tape on the valve.
Well sorry to say I still don't have a working clutch. I have the weekend off and I will try bleeding air from the top as you have suggested.