Most systems (at least GM) can be bled at the calipers just like a normal system. As long as you can undo the bleeders (IE not frozen in rust). Usually just pump brake pedal to firm, then hold. Assistant opens bleeder valve and allows old fluid to drain out. Add new fluid in master cylinder as it gets low. DO NOT let MC reservoir get empty. Repeat at each caliper until new fluid comes out.
Brake Fluid has a service life of like 2-4 years since it can attract moisture.. Boiling brake fluid is not a good thing!How to change the brake fluid with antilock brakes on a 2004 chevy trailblazer?
I don't know why you would need to but I don't know the situation bleed them start with the rear left then rear right then front right then front left keep adding fluid with out car running pump the brakes 5 times then hold the pedal down and have a friend open the bleeder the pedal will go to the floor just keep holding it once the fluid stopes coming out close the bleeder repeat the steeps and keep adding fluid you will flush out the old fluid and your new will be in with out on air in the lines if you need any more help email me at kirby242007@yahoo.com hope this helped
