Braking issues

I’m having the weirdest problem with my brakes. I’ve always had pretty soft brakes. Just the pedal goes down pretty far before the brakes engage. I’ve gone through the whole braking system and replaced pretty much every component with nothing fixing it.

I just moved my truck up to Idaho from California last week. We are getting a pretty big heat wave this summer and it’s been around 110 every day but at night it drops around mid 60s. Every morning when I first get in my truck and drive it to work the brake pedal is pretty soft like how it used to be. but now as a day warms up and it gets around 100 my brake issues completely go away and they feel like a normal car breaks. this makes no sense to me, but I’m not very experienced and brakes.

what could be causing this?

 

Did you adjust the rear brake shoes properly?

 

yes. It’s got to be something abs related or air in the lines. I’ve bleed this thing like hell and still no resolve.