- #1
zanick
- 383
- 23
As part of a racing community, there is a discussion going on that talks about compressibility of brake fluid. the Street car versions have a value of 6.5E-05 and the racing stuff is 4.5E-05 both at a pressure of near 5000psi. there is talk about the difference of the racing fluids which compare two for example , with a 25% difference between the two.. 4.6E-05 vs 4.5E-05.
is it possible that someone could feel the difference in brake pedal pressure, in a car with the two different fluids in the system , comprised of fluid lines, calipers , and actuation systems (master cylinders made up of springs and seals along with brake pedals attached to long levers)?
intuitively, we are talking about a very very small difference in compressibility for fluid in general, and the difference of the two , even if 25% greater is a very very small value as well. for those familiar with automobile braking systems there is a knowledge that the fluid also can absorb water which boils at above 100C and the fluid itself which can boil at temps in the 280C range certainly when it boils under extreme racing conditions, the pedal does feel much softer until the fluid is replaced or the water or brake fluid , condenses back to fluid again.
as far as compressibility of the fluid,, could the compresibility of the fluid actually be felt before any of the heat based factors take effect? keep in mind that the braking system is comprised of :
50ft of 2mm diameter brake lines, calipers with reserviors and pistons/seals, and a master cylinder with a plunger (like a 10mm syringe) and a foot long pedal
thanks for reviewing my quesiton
is it possible that someone could feel the difference in brake pedal pressure, in a car with the two different fluids in the system , comprised of fluid lines, calipers , and actuation systems (master cylinders made up of springs and seals along with brake pedals attached to long levers)?
intuitively, we are talking about a very very small difference in compressibility for fluid in general, and the difference of the two , even if 25% greater is a very very small value as well. for those familiar with automobile braking systems there is a knowledge that the fluid also can absorb water which boils at above 100C and the fluid itself which can boil at temps in the 280C range certainly when it boils under extreme racing conditions, the pedal does feel much softer until the fluid is replaced or the water or brake fluid , condenses back to fluid again.
as far as compressibility of the fluid,, could the compresibility of the fluid actually be felt before any of the heat based factors take effect? keep in mind that the braking system is comprised of :
50ft of 2mm diameter brake lines, calipers with reserviors and pistons/seals, and a master cylinder with a plunger (like a 10mm syringe) and a foot long pedal
thanks for reviewing my quesiton