i'm gonna die if i don't fix this

[green91]

Depends on what is wrong w/ the booster. In my old truck, mine caused a vacuum issue causing soft pedal. I replaced the master cylinder first b/c it was already wearing out and then we looked and there were no leaks so it had to be the brake booster which fixed it.

For a vacuum booster to somehow make a pedal softer, you would have to increase the amount of vacuum going to it. A vacuum leak, hole in diaphragm etc would make your brake pedal harder due to lack of vacuum assist. I cannot think of a way that a bad booster would make your pedal softer.

[Krytdrgn]

For a vacuum booster to somehow make a pedal softer, you would have to increase the amount of vacuum going to it. A vacuum leak, hole in diaphragm etc would make your brake pedal harder due to lack of vacuum assist. I cannot think of a way that a bad booster would make your pedal softer.

If there is less pressure in the line the pedal travels easier.

Either way, if this is the case you should hear a suction type noise when you apply the pedal. If not then it is something else.