One of my trucks is a 99 f150 4.6 4x4 5 speed an in the 7years I've had it I put 4 slave cylinders in it counting the factory one what's the problem

 

YOu must drive the ***** out of it, or the maybe the pedal is bent/out of alignment causing the Rod to go in and out crooked. Do you put fresh quality fluid in it evertime you change it. Dirty contaminated fluid can ruin the seals inside.

 

It don't have a rod just hydraulic Iy never smelled like I was burning the clutch either

 

And yes abt the fluid

 

A crap, you said slave, not master. Are you replacing the throw-out bearing also, and installing it correctly.

 

my dad is an ase certified mechanic he's the one replacing it so I guess so

 

Well now you got me, he would catch anything else I can think of mechanically. I am sure your dad asked you this already as I am a dad but, You don't happen to ride the clutch do you?

 

No but thanks for the help if it does it again I'm selling it

 

God, I've done that job once, what a bastard. Your dad must really love you. You have to pull the transmission to get it out. The truth is that it's a really crappy design. There is a spring in there that keeps the thrust bearing in constant contact. To answer the question, the new Slave cylinder always comes with a new throwout bearing. Most of the slave cylinder is made of composite. If you are not using a quality built slave cylinder it's not going to last long. The one I replaced it with was by TruTorque, and it's lasted a few years. Not sure anyone sells the TruTorque brand anymore. Slave cylinders usually fail because people don't change the brake fluid in the system. The high alcohol DOT 3 brake fluid absorbs a lot of water, and corrodes parts in the system. If you've replaced that many of them in such a short time, it's not the brake fluid. There is also no way to install it improperly. I imagine the problem is you are using a poor quality replacement one, which due to the design is failing frequently. The only recommendation I can give is to find the best quality one you can find to replace it, and then use synthetic brake fluid in the system.

Kurt

 

Thanks for the info and 4x4 makes it a bigger bastard