I brought my Toyota aqua car to mechanic for tuning and during the tuning warning lights of ABS or break turned On... The mechanic turned off the lights and said that ABS is not working properly nd got damaged... After that I checked ABS by pressing break almost 3 times while driving...At that time ABS was working properly but after some time its warning lights again turned On and now ABS is not working. Kindly guide me what is the issue to my ABS?