A couple months ago I replaced a leaking clutch master cylinder on my 91 Accord (f22a6), after installing the new one the clutch pedal goes straight to the floor and I have to use my hand to bring it back up. I then realized I hadn't bench bled it before putting it on so I removed it, exchanged it for a new one to make sure it wasn't defective, bench bled it before and after installing it but made no difference. Bled the lines for hours and days and went through almost 3 big bottles of brake fluid. I hadn't changed the slave cylinder only because it wasn't leaking and didn't show any signs of defects or malfunction. I even bought a $50 vacuum bleeder but it didn't seem to help at all. Since it was gonna be sitting there I thought id go ahead and install a new clutch cause it started slipping a bit before I found out I needed a new CMC as well. So we got the new clutch in and put everything back together, I bought a new slave cylinder, bench bled it and installed it, clutch pedal still goes to the floor. It's not leaking from anywhere, when I open the bleed screw on the slave cylinder fluid does come out so there no blockage or anything in the lines preventing the fluid from circulating. The spring on the clutch pedal is fine and not broken or worn. I need this fixed because i start community college soon and its my only way to get there. I don't know anyone else that's into Hondas so I'm basically on my own here. Please help !

 

I thought the bleeder screw for the slave was lower than the slave piston, thus you cannot properly bleed it as installed. And need to either disconnect or push the slave piston all the way back to prevent any air from being trapped in the slave cylinder.

But I'm an AT guy, so I may be wrong.

 

I understand but I didn't bleed the slave after putting it on, only the master cylinder. You probably read it wrong. But yeah the only thing I can do at this point is remove it and bench bleed it again to make sure.

 

What exact procedure are you using for bleeding the mc ? How much clutch free play do you have ?

 

Before installing it I bench bled it, using a clear line from where the hydro line screws in, to the reservoir and pushing the rod with my hand till no air bubbles are present. Same when I bled it while it was installed only I'd be pressing the clutch pedal slowly with my hand while someone watches for the air bubbles. I don't have any clutch free play, or maybe too much. As soon as I press the clutch pedal it slams to the floor and wont come back up with out me manually bringing it back up.

 

I'm not talking about the bench bleeding, after installing it, what exact procedure did you use to bleed the system ?

 

Well I just told you how I bled the CMC itself after installing it but I bled the whole system the usual way, pressing the clutch a couple times, keeping the clutch pedal down before opening the bleed screw, closing it and checking the fluid level in the reservoir, repeat.

 

Ok sorry I bothered you. Carry on.

 

You didn't bother me but what do you mean carry on ? I need help

 

There are two bleeder screws, one at the CMC and one at the CSC.
If you are only bleeding the CMC then you are not completely bleeding the system.
Depending on how/where your car is parked you may not be able to properly bleed the CSC, fluid may come out but air will still be trapped in the system.

 

It's parked on a flat street, I've also bench bled both the CMC and CSC before installing them. It's not leaking anywhere either, the fluid level in the reservoir has not changed and there are no stains on the floor under it, its been in the same spot and has not been moved in last couple days.

 

Are you getting any movement of the slave cylinder? It definitely sounds like a bleeding issue, just have to pen down the root of it.

 

No it doesn't move at all. It most likely is, I probably did something wrong so I'm removing them both this weekend, bench bleeding them again, and reinstalling them. Hopefully that makes some type of difference because its all I can do at this point.

 

Sometimes the easiest way to bleed a stubborn hydraulic clutch is to connect a hose from the slave bleeder screw to the master reservoir and continually bleed it. If the slave does not move at all while pushing the pedal then you either have a leak in the slave, a leak in the master, or still have air in the master.
When you bleed the slave does fluid come out with any force from the master in relation to the pedal push?

 

I should have long enough clear tubes to make one big enough to try that method, but now that you mention it I haven't paid any attention to that. I'll check it out when I get back in town this weekend and let you know how it goes

 

I think what holmesnmanny was saying when he said "Ok sorry I bothered you. Carry on." is that you were being a little snappy at him.