Abstract
Anti lock braking system is a modern braking system which could significantly improve directional stability and reduce stopping distance of a car. However this system still too complicated and expensive to use on every car because its use complicated and control system.
In this research, without using an expensive control system a combination of load sensing proportioning valve and spring membrane was use as a main component to develop the effect of anti lock braking system.
Base on vertical load applied on each tire, a load sensing proportioning valve could control fluid pressure to the appropriate level to lock the wheel. On the other hand a spring membrane could fluctuate pressure of brake fluid in order to develop the effect of anti lock braking system.
The result show that, load sensing proportioning valve alone could control fluid pressure in order to reach equal time lock between front and rear wheels. A combination of load sensing proportioning and spring membrane could develop significant effect of anti lock braking system called semi lock brake system which is simple and economic enough to use for every car.