Attention: TDR Forum Junkies 
My lot is unlevel and I use 4WD moving my 5th wheel trailer around. When attempting to stop the trailer on a steep forward down hill grade the brakes are almost non existent. With the truck stopped the brake pedal drifts down all the way.
I thought it was the master cylinder so I just installed a new one. It was bench bled before installing it and all four wheel cylinders bled. I still have the same problem. With the brakes pumped and held down the pedal slowly drifts down. How do I check the brake booster? Is there any other things to check?
I thought it was the master cylinder so I just installed a new one. It was bench bled before installing it and all four wheel cylinders bled. I still have the same problem. With the brakes pumped and held down the pedal slowly drifts down. How do I check the brake booster? Is there any other things to check?
