Cooling your brakes
Being from the east coast I've yet to encounter my brakes heating up enough to require pulling over to let them cool down, at least not that I know of. This summer/fall we're doing our first trip out ...
Forum Discussion
Turtle !?!?!!!!!!!
You've got a GREAT ability to envision stuff mentally....and a healthy
dose of free associative abilities (thinking very thin layer of molecules)
Yes, the 'thickness' of the pressurized air molecules would be extremely small,
even smaller than you thought
A typical molecule is measured in Angstrom's: 10 to the minus 10 m
(one ten-billionth of a metre) or 0.1 nm. CAN NOT be seen using the
visible light, as that wave length is longer than a molecule. Meaning
that if you could get a microscope that could magnify down to that
level...you'd have to use another type of wave length other than what
our eyeballs are designed for (human eye is sensitive to wavelengths
from about 4000 to 7000 Å...AKA visible light)
Even hundreds of thousands of air molecules would be less than a
thousandth of an inch
The 'shock wave' manifests itself with that compressed air molecules (preceding)
and travels faster than the speed of sound. Otherwise the air molecules would
get outa the way to not become compressed into a solid (adiabatic compression)
This kind of stuff fun for me and thank you for the opportunity to jaw a bit
So back to the OPs question and your question on hydraulic PSI
The MC to Caliper PSI is still the same, but the out gas PSI is HIGHER to bend
the caliper bridge apart a 'few' angstrom's...and/or compress some other
component, etc
That then has an 'air bearing' between the friction material and cast iron surface
Since the friction material no longer touches the cast iron, there is next to
no friction. There will be some spots/areas that do touch, but the total area
is greatly reduced. Because the friction material will NOT outgas
evenly across it's surface
Why cooling the brakes (friction material, cast iron, etc) will slow down the
out gassing or stop it
It will come back sooner, as the friction material and cast iron is
already heated up above ambient...they why of stabbing the brakes and
let off for them to cool while no braking is happening
Why continual braking will continually keep the friction materials hot enough
to out gas to float the pads off the rotor and the subsequent reduction in
braking
You've got a GREAT ability to envision stuff mentally....and a healthy
dose of free associative abilities (thinking very thin layer of molecules)
Yes, the 'thickness' of the pressurized air molecules would be extremely small,
even smaller than you thought
A typical molecule is measured in Angstrom's: 10 to the minus 10 m
(one ten-billionth of a metre) or 0.1 nm. CAN NOT be seen using the
visible light, as that wave length is longer than a molecule. Meaning
that if you could get a microscope that could magnify down to that
level...you'd have to use another type of wave length other than what
our eyeballs are designed for (human eye is sensitive to wavelengths
from about 4000 to 7000 Å...AKA visible light)
Even hundreds of thousands of air molecules would be less than a
thousandth of an inch
The 'shock wave' manifests itself with that compressed air molecules (preceding)
and travels faster than the speed of sound. Otherwise the air molecules would
get outa the way to not become compressed into a solid (adiabatic compression)
This kind of stuff fun for me and thank you for the opportunity to jaw a bit
So back to the OPs question and your question on hydraulic PSI
The MC to Caliper PSI is still the same, but the out gas PSI is HIGHER to bend
the caliper bridge apart a 'few' angstrom's...and/or compress some other
component, etc
That then has an 'air bearing' between the friction material and cast iron surface
Since the friction material no longer touches the cast iron, there is next to
no friction. There will be some spots/areas that do touch, but the total area
is greatly reduced. Because the friction material will NOT outgas
evenly across it's surface
Why cooling the brakes (friction material, cast iron, etc) will slow down the
out gassing or stop it
It will come back sooner, as the friction material and cast iron is
already heated up above ambient...they why of stabbing the brakes and
let off for them to cool while no braking is happening
Why continual braking will continually keep the friction materials hot enough
to out gas to float the pads off the rotor and the subsequent reduction in
braking
