Brake Fluid Draining?

[napkinthief]

Can the brake fluid be drained from the system completely? My reservoir cap went missing and unnoticed for about 2 weeks (maybe more) and this is my 2nd cap ive lost, but there is all kinds of nasty in there now. I covered with a plastic bag and a rubber band until I can get a new cap, but how can I change the contaminted fluid? I also think it may have gotten water in it since the high amount of snow and moisture.

 

[DSM90AWD]

You can MightyVac it out or just bleed the bulk of the fluid out thru the rear passenger caliper valve, addding new fluid as you go so as not to suck in any air (running the bleeder line into a clear container of new fluid).

Stop pumping (the foot brake/MitiVac) after the fluid looks clear (e.g. the new stuff). Now do the other three corners

 

[LunarEclips]

and buy a cap for goodness sake! They are merely 20$ or less....sheesh