Air. Air trapped in a hydraulic system will render it hopelessly "squishy". You need to bleed master cylinder to slave. On most cars this is easiest procedure in the world because all you do is open bleed screw and let gravity perform the rest (keep the reservoir full!). Unfortunately DeLo clutch system is horizontal (like brake lines), not vertical. Three methods: 1) Have assistant pump pedal and hold, then you crack bleeder screw, over & over until fluid runs clear and bubble-less. 2) Completely submerge bleeder hose in brake fluid, oriented so bubbles will rise away from exposed end, and pump pedal yourself (bleeder screw cracked whole time. You can prevent minute amounts of air seeping past afterwards by leaving hose attached as screw tightened. Whips around a bit...). 3) Use a vacuum pump suitable for liquids to pull fluid from slave end. Second is my method of choice. Actually prefer over pistol vacuum pump (probably because I've been doing it longer). Inaccessibility of DeLo slave cylinder might make a convert of me... Whichever method you use, keep reservior full. If it runs dry you'll suck air into system and have to start all over again. Bill Robertson #5939 >--- In dmcnews@xxxxxxxxxxxxxxx, "bluemax86" <massimot@xxxx> wrote: > Hi all, > > This is my first post to the list. I have recently replaced my master > clutch cylinder. Since then the pedal feels rather light until the > very end and there is maybe 1/2" travel between the clutch being > fully depressed and when it starts to engage.