I am expieriencing a bad break pedal droping to the floor in my 89 xj. I bled the lines checked the lines and so now my thought is bad master cylinder. I'm wondering if anyone has rebuilt one and if its worth it? Or should I have to buy a new one?? I prefer the cheapest way to get it fixed that will hold up well. Thanks

 

Replace it, cheaper in the long run.

 

X2

 

Should upgrade it to a dual diaphragm booster as well.

 

Yep. WJ stuff.

 

That's the same mantra we heard in Vietnam when guys started complaining about carrying extra ammo. (most people don't realize ammo is heavy)

Never rebuild a M/C yourself unless you're restoring something to original and NOS parts are non-existant. In some instances you're not even allowed to use a rebuilt brake cylinder.

You can pay for it now, or God forbid the brakes fail, pay for it later.......