Just specifying incase it makes a difference, about 7 months ago when my dad passed it down to me the brakes went out, and needed a new master cylinder, we replaced it and bled the brakes. Then today when I was getting ready to leave for work I noticed the brakes felt how they did before they gave out last time, super soft and almost to the floor, like I said I replaced the master brake cylinder, the brake lines look fine but will check for potential leaks, also one side has a new caliper the other side is still the original, would replacing the caliper, rotors, and pads along with bleeding fix my issue? Or should I do all that and replace the brake lines? I’m hoping I don’t have to replace the brake lines but if I got to I will, any advice would be great thank you!

 

Find the leak. They can sometimes hide..... the fluid pools somewhere, and doesn't drip down until there is a fair bit of it. The full size trucks were notorious for the rear brake line to rust out and break back by the gas tank, which was impossible to actually see......

 

Could it be by chance the rubber hoses, or the caliper I haven’t replaced it’s still the original caliper, just hoping one of these might be it I’m going to work on it Monday and see, but I’m really hoping it’s not the lines 😭

 

Replacing lines really isn't all that bad...... I have all the right tools though..... I go to the parts store, grab an appropriate length/size line, and cut and bend it for what I need. I did the entire rear line in 15 minutes. Bleeding took a while longer though.

Do you just have a soft pedal? Or does it slowly sink to the floor if you hold pressure on it?

 

replacing pads wont make a pedal firmer. Replacing the caliper only will if the old one is leaking.

As HeyYou said, look around for leaks.

 

so when I press on the brake it almost goes to the floor before actually stopping, I turned it off and pumped it which then it felt fine then turned it back on and it went to the floor again before stopping and tried pumping them again while it was on but no better result, would replacing metal brake lines be possible to do on my own or with someone we’re both not the best mechanics but we know the basic maintenance and stuff

 

Is the best way to find leaks is have one person hitting the brakes while the other goes under the truck and look?

 

Having two people makes pretty much any job easier. Just having someone sitting there pumping the pedal, while you crawl around under the truck, makes life easier.

 

Alright, if I don’t find leaks and the caliper is fine is it possible the brake booster might have went out or is causing a leak, and if so how would I be able to see if a leak happens, also I will be checking the hoses on the brake booster

 

Pull the vacuum line for the booster, wherever it's easiest to get, see if there is any brake fluid in there. If there is, that booster is shot too.