so i was driving along today and i noticed that if i hit the brakes hard they work just fine but if i am going down a hill and slowly press on the brake pedal, the pedal will slowly go to the floor and i get little to no braking power.

i bled all the brakes using a vacuum bleeder and it did not help anything, this is leading me to think that my master cylinder is gone..... any body have any ideas? are the LSJ master cylinders rebuildable?

 

I'm guessing you checked to see you have enough brake fluid right? How are your pads?

 

I would just get a new master cylinder if that is the problem, but I'm not to sure if your able to rebuild one

 

did you run the system dry by chance? if you did there is likely air in the abs unit. to properly bleed it you need a scan tool that can put the abs is bleed mode.

 

yup fluid was full and pads are 75%

 

nope, was never ran dry