('04 Dakota SXT) So after finally getting my new front right caliper to stop leaking at the banjo bolt I bled the front brakes, got good pressure, and threw the wheels back on. Now I have good pressure until I turn the truck on. Once it's running the brake pedal sinks right to the floorboard... This has been a journey just to get to this point and I'm pretty near done.

 

Welcome to DF. Moving to the correct section.

 

Does the pedal sink to the floor when you start the truck or when you apply the brakes?

Can you pump the pedal up?

You likely still have air in it. Are you positive you have no leaks? You did use new washers on the banjo bolt?

 

does your truck have a big ugly block right next to the master cylinder? If so, you have RWAL. Have somebody watch that unit very closely as you pump the brake. If a bolt pokes out the back, your RWAL is defective.

 

Bleed all 4 brakes with the engine running. You've still got air in the system.

If you had said you worked on the rear drum brakes, I would have suspected that you needed to adjust them.

Keep at it, you'll get 'em!