stilllearning6

1997 K1500 Suburban 4WD 5.7 Liter:

Need to replace rear brake lines that are pure rust.
Hoping to disconnect the rear brake line at whatever coupling I can find that is not yet rusted.
Then, I would like to thread onto/into the existing coupling some sort of stopper plug to prevent loss of brake fluid while I remove the rear brake line section(s).

Question: what size is the brake line? I am leaning toward 3/16 . Do not know.

Question: Can I buy a stopper plug to thread into/ onto the coupling that is still on the vehicle?
If yes, what size ?
Is it a male or female plug?
female plug?

tech2

]f you depress the brake pedal slightly 1 or 2 inches ( I use a long pry bar wedged on the seat and brake pedal)...the brake master cylinder piston will close off the reservoir compensating ports...this will keep the m/c from going dry. you will only have to bleed forward of the master... which is easy.

stilllearning6

OK, thank you. I'll try the depress pedal method.

Can I depress it to the floor?
I am not familiar with knowing how far to depress pedal. One to two inches is difficult for me to achieve w/o the right tools .