Hey guys, I've come across a really strange issue regarding the Perfection brand replacement slave cylinder for my 1994 Mazda B4000 truck. This slave cylinder brand is shown in this blogspot video: PERFECTION: Removal and Servicing of Clutch Master Cylinder to Slave Cylinder Connections Anyway, I got extremely frustrated when trying to bleed this slave cylinder. For some reason the slave cylinder doesn't seem to even fill up, and there are constant airbubbles coming out of the bleeder valve. It's like the fluid completely bypasses the slave cylinder piston chamber and comes out of the bleeder valve; when I compressed this slave cylinder by hand while it bled, I didn't feel any fluid resistance at all, nor did any fluid come gushing any faster out of the bleed screw. I've been completely baffled... I took the part I bought back to NAPA for a replacement, and the same issue. What the heck? My old slave cylinder has a bad seal, but I tested it on my clutch system after being extremely frustrated with the Perfection slave cylinder to see if there might have been a leak someplace else in my system. But the old slave cylinder filled up fine, air bubbles qucikly vanished, and when I squeezed it I could feel it push against the resistance of fluid as opposed to air in the last slave cylinder; fluid came gushing out of the bleeder valve when squeezing it by hand as it should. My dad compressed the clutch pedal while I felt resistance with my hand with the old slave as well; worked fine. With the Perfection slave cylinder, it simply pushed nothing but air it felt like, and it didn't even spit any extra fluid out the bleeder valve. Something is definitely screwy with the Perfection brand slave cylinder... it's hard to believe that I'd get two defective parts in a row. What are the odds of that? Has anyone else encountered this problem with this same brand slave cylinder? This has been one very frustrating week... taken my tranny on and off twice because of this problem.