Mechanical Engineering - Automobile Engineering - Discussion

@ALL.

Present days the fluid systems are increased to stable the heavy heat resistance. Incase of vapour locking the fluid gets very fast time take to the original state.

Give me some examples to present vehicles if fassible?

Vapor locking due to air in the system is possible and high temperature.

Every brake fluid has designed with his stream temperature absorbing capacity when its crossed then it goes towards vapour then locking system for a break is occur.

Braking generates considerable heat and to resist these high temperatures without boiling, brake fluid is designed with a high boiling point. But brake fluid is also hygroscopic, which means it absorbs water. In any hydraulic brake system, the brake fluid gradually absorbs moisture and this reduces the brake fluid's boiling point. Once this moisture absorption reaches a certain level "under prolonged, hard braking, especially in hot weather or heavy loads " the heat can cause the brake fluid to start to boil, creating gas bubbles. As gas is far more compressible than liquid, the driver will experience no pressure at all on the brake pedal, resulting in total loss of brake power known as vapour lock.

Brake fluid like many other fluids expands under severe and continuous pressure and this give rise to the formation of vapour due to rise in temperature and the resultant effect is that it make brakes ineffective due to vapour lock.

In present-day Cars Vapour Lock in Brake system is a distant possibility, might be in Heavy Commercial vehicles it can happen but not sure.

Brake fluid like many other fluids expands under severe and continuous pressure and this give rise to the formation of vapour due to rise in temperature and the resultant effect is that it make brakes ineffective due to vapour lock.

It is possible when the whole brakes lines are unfilled, with the full filled the brakes lines a small quantity of air is in it because brakes lines have narrow size. To comes out the air from brake line, first filled the brake line, then the end of the brakes lines is slight loss the applied the 3or 4 time the air from the lines comes out. There is no another case locking of vapour or air in brakes lines.

Most of the braking fluid contains glycol fluid. It is hygroscopic fluid. The conversion of water in the brake fluid to steam when the brakes are heated significantly which causes compressibility in the brake system. This vapour lock leads to increased pedal travel and can result in a significant loss of brake effect.

Please clarify the concept of vapour lock.

Whether it occurs due to temp rise by frequent operation of the system or by hygroscopic nature of brake fluid? Or both?