Hissing sound in the cabin - brake related

[FUNGC]

@c900t16

now before i buy a MC and/or booster, i did mroe reading on old posts and it seems when the booster fails, everyone that has had that problem has a sinking pedle. Mine is just really hard and has very very minimal travel.

Any ideas? maybe the booster and MC are good, but the lines just need to be bled?

i think you should try this.

also downloading a FSM will help you out alot! just a suggestion

heres also a diagram of what you need to take out in the cabin.