Omg, I am not stating an opinion. I won't waste my time with my credentials. It permeates throughout the system. It doesn't boil off for the same reason it doesn't boil off from anti freeze. Do you even know what brake fluid is made of? I do. Polyglycols. Meaning, multiple types of xxglycol mixed together, one being ethelene glycol, ring a bell? Yep, anti freeze. I'm not going to let you drag me down to your level and beat me with experience in an argument. Enjoy your blissful ignorance and have a wonderful day! I will be ignoring further comments, I win!
Other than a personal attack, you have shared nothing more than your anger and inability to address my specific counterpoints.
Maybe if you take a short time out, you might be able to rejoin the conversation less hostile later.
Ignoring is related to "blissful ignorance" I am told.
Nxcoupe said:
I would disagree based on my 50 years of working on vehicles. Brake fluid by its chemical nature is hygroscopic. It absorbs moisture.
You are stating the obvious, but you have not addressed how the amount of hygroscopic effect is had by a single pin hole vent on the top of the MC and that absorption travels many feet thru a small steel tube all the way to the caliper which is the ONLY heat impacted component of the brake system, understanding the fluid is effectively static except under application when it might move bidirectionally an inch? You are saying that water would 'boil off', which is absurd an assumpton
I never said "boil off" because the moisture has reacted
Not sure if it really "reacts" I submit it does not with the fluid and cannot 'boil out', if it did, it would create a gas bubble
water boils at much lower temp and why it is anathema to a brake system in the brake system and you'd lose hydraulic pressure in the system as a gas can be compressed.
That "boiling" you note" is however the often cause of heat brake fade, no matter what the condition of the brake fluid is The moisture is
homogeneous throughout the hydraulic system
Can you support that claim?, turning the fluid corosive
at what point of "turning" can you support that claim?. Moisture gets into the system, plain and simple.
How? Let's address that fact that doesn't get discussed about DOT 3 and 4 fluid, it degrades over time as humidity(water) makes it's way into the system.
I submit the small amount moisture that might travel very slow if at all thru the lines and causes little if any harm until somehow it reaches the calipers or wheel cylinders The master cylinder covers on our old cars were notorious for leaking fluid, that means that moisture in the air can also make its way into the fluid. This causes it to rust from the inside out
That effect is caused best by consolidated water sitting in a brake line at one spot for a length of time, and hence why the hygroscopic effect is useful because water cannot coalesce for long in one spot inside a brake line, it is absorbed and diluted. According to your view of the system, brake fluid would never need changed
I never said that, parts would never wear out and brake lines would never rust through. It is possible for moisture to wick into the system, yet fluid to not come out due to the very nature of the lip seals used in wheel cylinders, master cylinders and calipers.
I agree, but I can't prove that, you are welcome to. I addressed by my mention previously water might enter the caliper/wheel cylinder by water immersion and/or wet driving, and parking the car wet before the moisture could be heated out of the seal area by driving/braking.