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Pedal up, less pressure Posted by Bill Homer [Email] (#3427) [Profile/Gallery] (more from Bill Homer) on Thu, 18 Aug 2005 09:07:54 In Reply to: Re: how much pressure?, Ironjoe, Wed, 17 Aug 2005 22:42:55 Members do not see ads below this line. - Help Keep This Site Online - Signup |
I had a lot of trouble bleeding my clutch system last fall - this system is very touchy. I eventually got it to work properly by keeping the pedal in it's normal resting position (i.e. UP), and ensuring that the fluid in the reservoir was constantly at a very high level - this part is VERY IMPORTANT. My guess is that you are getting air into the system.
In the reservoir, there is a separate intake port for the clutch hydraulics up near the top - look closely. I guess that this is a safety measure to preserve braking function even after a catastrophic leak of the clutch system. Using just a bicycle pump without a way to feed in new fluid will take a lot of work and possibly several attempts to get it right, as once the hydraulic fluid level drops below this intake port, air will be forced into the system, negating your previous work.
Various types of power bleeding/flushing gismos are available, including what looks to be a nice all-in-one device with a gauge made by Motive (I've never used this one), available from various site sponsors. I have a different kit made in the UK (E-Z-Bleed?) that is powered by a hose off of a spare tire, which pressurizes a reservoir, then has a hose that goes to a replacement cap for the fluid reservoir - this delivers pressurized replacement fluid. As a note, the instructions that came with my kit strongly warn the user not to exceed 20 psi pressure at risk of damage to the hydraulic system.
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