Wtf?!!!!

New clutch, pressure plate, slave cylinder, etc. Properly bench bled master cylinder. Installed with 1/8inch piston movement. Hooked up to slave cylinder and gravity bled (5 reservoirs)..now clutch pedal has no pressure and moves very easily to the floor. Wont go into gear. Ugh.....I'm so sick of this truck! Help me!!!

 

If pedal goes to the floor and there is not a pool of hydraulic fluid under the truck then master, new or old, has failed

Either its piston seals failed or its check valve did(see if reservoir level goes up as pedal goes down, thats what the check valve prevents)

 

I bench bled master and it was done properly. How can it fail the second I install back on truck?
Thanks

 

How would I know when it would fail?

Just saying that the point of a master cylinder, for clutch or brakes, is to push fluid thru a hose, yours isn't doing that so..............................its broken

 

You obviously arent understanding what I'm saying. I bench bled the master cylinder out of truck. It was working like its supposed to. I installed it into truck and now it's not working?

 

Yes, I understand, its the "now its not working", thats the reason I say its broken
Any part works right up until it doesn't, when that happens is anybodys guess

If you unhook the master's line from the slave, the quick connect fitting, this fitting seals the line so no fluid can come out.
The clutch pedal should then be locked at the top, can't push it down at all, thats good
If pedal is not locked at the top, if you can push it down, then master is bad, assuming fluid is not pouring out of the quick connect fitting, lol.

 

Because bench bleeding doesn't require the master cylinder to create any pressure.

The master cylinder was defective right out of the box.

 

I agree, if you're properly bled, and no fluid is pouring out of the slave or any other line, the master is bad. If the slave is bad/cracked, you'd see the brake fluid on the ground

Don't ask me how I know.

 

The master cylinder is not new. Everything else is. I guess it's time to buy one and see what happens. Ugh. Thanks

 

I have purchased a new master cylinder and bench bled it to specs. Installed master cylinder to firewall and to slave cylinder. Gravity bled slave with 2 reservoirs of fluid. Pedal still soft......what am I doing wrong?