Cover brake reservoir while bleeding?

[robertbarr]

I've read all about the hygroscopic nature of DOT4 brake fluid, which is one reason I'm going to flush my fronts. The question is, just how retentive should I be about keeping the system & containers sealed?

That little sight window is just about useless for gauging the remaining volume of brake fluid, and I expect to pump roughly 8 reservoirs-full (not a word, but it'll do...) through the system.

Is it important to keep that reservoir cover on? It's warm & drizzling at the time, so there's plenty of airborne H20... I'm going to keep it covered and top it off frequently. The question is, is this necessary? Could I get equal results by just leaving the cover off for perhaps 30 minutes while I work?

[Baatfam]

I've read all about the hygroscopic nature of DOT4 brake fluid, which is one reason I'm going to flush my fronts. The question is, just how retentive should I be about keeping the system & containers sealed?

That little sight window is just about useless for gauging the remaining volume of brake fluid, and I expect to pump roughly 8 reservoirs-full (not a word, but it'll do...) through the system.

Is it important to keep that reservoir cover on? It's warm & drizzling at the time, so there's plenty of airborne H20... I'm going to keep it covered and top it off frequently. The question is, is this necessary? Could I get equal results by just leaving the cover off for perhaps 30 minutes while I work?

Robert, I don't think you would absorb much, or any, moisture during a fluid flush....
However, I always set the cover back on to lessen the chance of fluid splashing out during the process...I don't bolt it down, just set it there...

[hampshirehog]

If you're working inside out of the rain there's no need to cover up while you're bleeding. Just keep and eye on the MC as you pump the lever to make sure that you don't squirt any fluid too high and on to some paintwork.

[Agemax]

if you have braided lines it seems to help in the bleeding process to keep the lid on