What's the quickest and cleanest way to drain all the fluid out of the lines? Should I open up all 4 bleeder valves and pump the brake?

I'm doing a rear disc conversion and will also be replacing the prop valve and all brake lines, so I figure it's a good time to flush the entire system.

 

i looked in the shop manual and it doesn't say, interested to know this procedure as well

 

I bought a hand operated vacuum pump that has an inline catch can and fittings to fit over the bleeder valve. Its like $34.00(Autozone) and you can drain the entire system without spilling a drop. You can also use it as a vacuum gauge etc...

I put the hose in the master cylinder resevoir and suck all of that out first and then all 4 bleeder valves.

Its also an excellent tool for bleeding the brakes/slave cylinders etc...

 

Hook up your rear conversion and then leave the bleeders open on all the calipers. Make sure you keep the resivior filled and it will flush the old crap out. Its kinda like a gravity bleed.

 

That's probably how I would do it.

 

But I'll be pulling all the old lines out to replace. Not to mention the prop valve that will also get replaced. I kinda want the whole system emptied before taking them apart. I just got a new paint job, don't want brake fluid all over.

 

I would open each brake outlet at a time and drain it out. After drain out refill the brake cup or whatever thats call @ the bosster and start pumping it out again through the caliper outlet again. Second time is to flush out all things. Then install back and re-flush the back hoses and refill then bingo there you go. Thats what I would do.

 

the less air you introduce into the system, the better.

dont "drain" your brake fluid. theres not that much fluid that will come out when taking the prop valve off. just cover things with a rag.

then after you replace everything, flush the system at each corner, one at a time. then doing it again for good measure since youve already introduced a lot of air. you should be fine after that.

to deliberately push air thru the system is a bad idea. i would specifically avoid pushing air thru the MC. youll end up having air stuck in the MC thats hard to get out and will take the longest path to push out. not advisable.