Pedal been really soft for a while. Getting ready to put the truck on the market.
Wanting to get the little stuff I can handle fixed. Tried to bleed the brakes today RR little fluid but no pressure LR same RABS same very little fluid. Front brakes good pressure no air air good to go. Pedal is still soft. I can pump up the brakes and the pedal still slowly goes to the floor. Truck running when pumping I can see fluid shooting back into the reservoir. Either my RABS is clogged up but wasnt sure if the bleeder valve is before any valve or the master cylinder is not pumping to the RABS.??

 

Any body? I believe I'm gonna keep this thing.

 

Master cylinder is bad.

 

I have the same problem but the rabs seems to be doing its job so I'll be ordering a m/c soon. Was thinking about biting the bullet on the zero loss booster since mine is pretty crusty looking. Still functional, just crusty.

 

Ok I changed the master cylinder today. Bled all the brakes worked all the air out the lines. Good pressure on back and front brakes and at the pedal. No pressure at the RABS unit. You can crank the truck up and the pedal drops. It stops a whole lot better. But something is still missing. Do I need to bleed them again tommorrow after working them tonight?