I'm working on my RX-7 project and my clutch is the latest problem to come up. I have a good slave cylinder on the car and was able to pull fresh fluid through the lines. I also got a new master cylinder and that hasn't fixed my problem.

The issue is that when I push the clutch pedal, it stays on the floor. I can pull the clutch up and it will stay, but there is no resistance when I push down. It won't stay between, only up or down. Any ideas on what the problem could be?

 

Sounds like you bought a bad master cylinder

 

You check the line going from slave to master?

 

The master cylinder is brand new and acts exactly like the bad one.

Yea, the line is fine. I was able to use a brake bleeder to pull fresh fluid through the line with the master cylinder disconnected.

 

Tons of air in the line or a bad master cylinder.

 

Did you actually get new units? Or rebuild them? Rebuilds don't always work.

 

prime the master cylinder, connect the hardline, then bleed manually.

 

Yep, it was a new master cylinder.

 

If you got the master from a local parts vendor(not a mazda unit) take it back. The chance it was not a working unit when you bought it is very good. Also, When I bought my car it had a leaky master, relaced that with one from autozone, the slave went dead within a few hours, got a slave from autozone, and then both where not working, took them back and went thought the same crap at O'rilly's. 6 master and slaves later, I bought a new slave, master and SS clutch line from mazdatrix, The worked perfect the first time, no leaking, or lack of working in anyway what so ever. I have 6 years exp working with cars, american and imported, and have found that hydraulics, starters, alt's, termostats, water pumps, and a few other items are junk from local auto parts vendors. there is a thread about this in the fourm somewhere. to lazy to look for it. best of luck.

 

if you changed all the parts and fluid theres a good chance you need to bleed system just as you would with the brakes