Quote:
Originally Posted by Shane
It's not the volume of fluid that activates a braking system ... it's the pressure.
|
actually I think i'd both. as you generally get one w/ the other.
from HRM
"the brake pedal pushes on a piston in a cylinder, called the master cylinder. The movement of this piston displaces incompressible hydraulic or brake fluid. The fluid flows through hoses to wheel cylinders, which push the brake pads against the drum or disc on the wheel. One advantage of the hydraulic brake system is that when properly combined, the piston size of the master cylinder and the wheel cylinder can multiply the force at the brake pads, so stopping the car is easier."
"If you need to press on the brake pedal with all your might just to slow the car, you probably have a master cylinder with too large of a piston diameter or a pedal ratio that is too low. If you have excess pedal travel, the piston size in the master cylinder is probably too small or the pedal ratio is too high. "
So the way I'm reading this is the MC controls psi AND vol. flow (displaces incompressible hydraulic fluid) to wheel cyl/caliper.
MC piston to big not enuff psi, though vol moved maybe more.
to small, psi but excess travel due to not enuff vol.
Vacuum assist just helps increase psi. which makes it easier to brake.
Or???
