Was going to blow out my lines with compressed air while I'm redoing my brakes. Was wondering if the air would mess up my BPV between the mas. cylinder and back brakes.

Gen1

Thanks

Probably not, but why not just take it loose?

SNQ. Why blow out the lines? Why not bleed them clean?

Don't want to take something loose I dont have to. The line to the back is already leaked empty as I had a back wheel cylinder go bad. So I replaced all the hardware in the back so the two rear hard lines were already removed and blown out. The old fluid looked like coffee.Just wondering...no biggie.

I'd leave the lines loose from the new wheel cylinders and refill the master cylinder, letting gravity and some judicious pumping carry the fluid/air back closer to the bleeder (or pipe joint). Then I'd bleed from the master outward, bleeding the master at the flare nuts to the hard lines, then each wheel starting with the closest. This should get new fluid everywhere without blowing wet shop air into the lines (unless you have a drier). Coffee colored and clear is not that bad (except it's probably wet). Cloudy or opaque coffee with grounds is not good. Means rust in the lines, and it will never quit.