Hello, I have a 1996 Honda Prelude VTEC. The clutch pedal sticks to the floor. I changed the slave cylinder (there was a new one in the car when I bought it still in the box). The old slave cylinder was stuck in the pushed in position, the new one seems good, I could push it in and it would go out on its own. After changing it I tried to bleed the system. Nothing would came out so I inspected the master cylinder and the previous owner left a socket on it seems that they were trying to replace it. I got a new one from the auto parts store and changed it. My brother and I tried to bleed it for over an hour. What we did was, he would pump the pedal about 20 times, leave it at the floor, I would open the bleeder valve for a second and close it, and then repeat. Fluids comes out of the hose attached to the slave cylinder but the pedal is still sticking to the floor. I have the hose in a plastic bottle with fluid. Even though we've pump the pedal about 500 times the reservoir has bearly lost any fluid. I'm not sure what the problem could be. Does the pedal height make any difference? I didn't mess with the height just changed the master cylinder. Also, the new master cylinder did not come with a new reservoir I'm using the old one. Currently I have the fan off and the radiator hose off because I needed some clearance to get to the slave cylinder I doubt this matters but just an fyi. Any help is appreciated. Thank you.

 

Sounds like you aren't really pushing fluid to bleed.

You need to have the pedal up, open the bleed valve, push the pedal in, close the valve, then pull it back up while the bleed valve is closed, and repeat until the air is all pushed through the line. There is a valve in the hard section above the tranny that dampens pedal feel, which can easily trap air. If the old fluid is nasty and brown, it should be obvious when clear fluid starts coming out the bleed valve that you have flushed the old stuff.

Once the air is all bled out, you should get proper pedal play with the bleed valve closed, just watch the clutch arm as the slave cyl pushes. If there is an internal clutch issue that keep the clutch from pushing against the slave, that would keep it from returning no matter how well the system is bled though.

 

Try leaving the pedal up, and a bare hose on the slave with the bleeder valve open for a few minutes to "gravity bleed". You might have some debris in the lines somewhere or in the accumulator (If it has one). Your doing the correct process by the sounds of it. Pedal up and down a few times with bleeder closed, pedal down, bleeder open, bleed fluid, bleeder closed, pedal up slowly and repeat.