When your truck is running, the brake pedal is vacuum assisted (Power Brakes) and will make your brake pedal feel soft. If you have a solid pedal with the truck off, then you should be ok.
If you do want to make sure that everything is good......
Check both front brake calipers and master cylinder for any fluid loss. If your brake system is not losing fluid, bleed the air from the whole system.
Bleed Components in this order ( Make sure Master Cylinder Does Not Run Out Of Fluid):
1- Driver side front caliper
2- Passenger side front caliper
3- Driver side rear wheel cylinder
4- Passenger side rear wheel cylinder
If you just replaced the brake shoes on the rear, your going to have to adjust them yourself initially. The auto adjusters will function normally after initial adjustment.
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If you pump the brake pedal does it get harder?
von mayer
No, when the truck is running they dont, when it's not it does.
von Nicholas Thomson