Flushing an old brake system...What's a Safe chemical to use?

Well not surprising but as usual nobodies in agreement on what to use .....Ha

For the folks that recommended using brake fluid itself it's without a doubt not going to cause any problems other than how the hell do I introduce it back into the system (brake lines) when its not under hydraulic pressure... I've already got one of those little pump oil cans and a super small funnel but i've yet to attempt it preferring to elicit at least a days worth of responses and opinions prior to flushing.

Ideally the aerosol based brake cleaner with the plastic spray tip would be the easiest and the cans I have clearly state that they are residue free but nowhere on the can does it mention actual flushing of lines...

To the internet I go and actually found an Alarming article (Welders Pay attention) on the active ingredient in Brake Fluid combining with Argon to form Phosgene which is Deadly.

Be Extremely Careful When Using Brake Cleaner!


Internet consensus: Use Alcohol, Brake Fluid or Brake cleaner.

Back to square one so guess i'll just hook the lines to my new MC and try gravity bleeding it with Brake fluid.

the day is not over :poke:


a piece of silicone hose in fresh container of brake fluid on one end and a vacuum bleeder at the wheel cylinder/caliper