I'm finally ready do my disk brake conversion after I put the front suspension back together. After taking off the front lines and replacing the rear wheel cylinders, I've noticed a lot of 'crap' in the brake lines along with the old fluid. Is there a better way of getting the fluid out other than blowing it out with air? I don't want to wait to bleed the brakes to get the old stuff out for fear that the crud in the lines will contaminate the new brake parts. I know I won't get it all out if I bleed after the installation and I want to get this right. Blowing air through the lines will just make it more difficult to get a proper bleed once the installation is done. Any ideas on the best way to do this? Please let me know what you would do. Thanks!!

Just a quick tip on the conversion..my buddy just did one, and had a heck of a time getting it to bleed (all new lines and mc)..Make sure the calipers are on the correct sides of the car with the bleeder screws UP..the calipers were not marked and if you are not paying attention, you can install them upside down. Also (on the front), when you get fluid in the line, you may want to leave the calipers loose, so you can take them off..air bubbles accumulated in the lines and was taking forever to bleed out (even with mightyvac)..pulling a caliper and straightening out the line allowed the air to rise up to the top and finally get sucked out. Tape/tighten the hell out of the connections..air tends to leak here.

As for the cleaning, I would use a vacuum pump to pull fresh fluid through the lines that you want to flush..not fast but it will work, or you could use the air method. It really helps to have someone to help you (watch the fluid level) to speed things up.

Thanks for the advice JTM. I'll have at least one person helping me so it shouldn't be too bad. This should be an interesting project to say the least, but since it's not my daily driver, I can take my time and do it right. Fun times ahead!!

I didn't have an electric vacuum pump so I bought a hand vacum pump worked great.

I have since bought an electric pump from Harbor Freight not very expensive it was less than the hand pump.

Master power brakes sells a brake syringe that you can use to squirt clean fluid thru the lines.You can also use it to prefill the system with fluid to make bleeding easier.
The chassis service manual for 71 says to use denatured alcohol for cleaning hydraulic parts.

Tape/tighten the hell out of the connections..air tends to leak here.
Surely you weren't talking about teflon tape as used on plumbing, air line and coolant fittings? You're not supposed to use tape on a flaired fittings. If it's leaking (I.E.not sealing) the flair or seat is bad or dirty or both.

As was said before, alcohol is probably the easiest way I've found. I have a blow tip with a suction hose connected to it for my compressor that sucks up liquid and blows the air so its like a power washer. I got the accessory with my little coleman compressor i use for filling up tires. That thing works like a charm. No crud whatsoever.