The brake fluid was one of my favorite test-tube torture tests that we
did four years ago can you believe it's been that long I decided to give this
another try because it was such an energetic and unexpected test when we
did it the first time this is because brake fluid doesn't have a reputation of
being flammable or unstable and it is designed to handle heat very well and
not oil in your brake system now there's a pretty good chance you didn't see it
the first time the video only has about 60,000 views after four years in this
test it took about four minutes from the time we started heating it up until it
reached the point where it could no longer contain the pressure it was as
loud as an m-eighty we had fire we had smoke it was just utter chaos in these early
tests we use a high temperature silicone to seal the top of the test tube the
silicone was strong enough to withstand hundreds of psi in the very high
temperatures but it was also designed to give out before the glass vial burst the
brake fluid reached such a high temperature that when the vapor cloud
reached the right air fuel ratio the right mixture it auto ignited and burst
into flames now this was filmed at only 300 frames a second in our new test
we're gonna be using the Khronos high-speed camera and record this at
2,500 frames a second
since the first test was so loud we decided to do this one in a remote
location so he wouldn't cause any panic and scare the neighbors now in the wd-40
test a lot of people were asking why I put a balloon behind the test tube well
the cameras were having a lot of trouble staying focused on the test tube because
of the heat waves they they just wanted to focus on the trees in the background
so adding the balloon really helped that now the brake fluid is absorbing the
heat very very well it almost immediately started forming bubbles and
boiling-- if the material cannot carry away the heat fast enough we end up
getting a hot spot on the glass and it will actually form a blister and blow
out right at that point prematurely and we can also see it the brake fluid never
breaks down never decomposes never changes colors or darkens now on a side
note some automotive companies recommend changing brake fluid in your car every
twenty or thirty thousand miles or every five years and other sites I looked at
said change it when it has a burnt odor or it's no longer clear looking but
after doing these tests on brake fluid I've got a question that because this
fluid is extremely durable under very high temperature conditions so what it
tells me is brake fluid is one of the fluids in your vehicle that you can kind
of get away with out changing very often the fluid in my truck is 14 years old
its original brake fluid and all I've ever done was just make sure that was at
the proper level in the reservoir but but don't let my bad habits and poor
maintenance on my truck affect how you maintain your automobile so far all
we've seen in this test is the liquid level rise the fluid is expanding it's
probably around 1,500 degrees Fahrenheit and as we continue to watch the liquid
level rises even more and completely fills the vial
and just like a glass thermometer heated up too much the fluid has to go
somewhere now in our first test we use the silicon plug which blew out but in
this test we're using an epoxy putty which is stronger than the glass itself
now if you remember the first test took four minutes this test only took two
minutes the brake fluid wasn't as hot in this test and we never reached that
flashpoint it never auto ignited now the high-speed footage shows that our epoxy
plug held up very well and it was the glass vial that actually burst and it
burst very quickly so in this test it didn't burst because of vapor pressure
but because of hydro static pressure the liquid expanded so much it had nowhere
else to go so the vial eventually blew out it's similar to if you took a
hydraulic pump stuck it to the top of the test tube and applied a couple
thousand psi to it we didn't have any fire and the sound itself was
considerably different we had a much duller deeper thud we used the same
brake fluid from the same container but got different results
with test-tube torture tests we never know what is going to happen did you
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