We were driving down hill and at a speed of 35km/hr and then slowed down as there was a speed breaker , when I applied the brakes the pedal was to soft and the car braked but it skid a few mtr and then when i apllied the brakes agin it was fine , it was moderately wet .After a few km agin we encuntered a similar problem after a couple to drives i never observed this again . What could have caused this problem , I have checked for leaks couldnt find any .What do you recommend to carry out further analysis