I have vitz 99 and am currently facing a brakes issue. The brakes work perfectly on CNG and Petrol, but when A/C is turned on, suddenly they become hard. The situation worsens when car is in 1st gear and very low speed, the brakes almost get jammed at very low speeds, but as soon as the car gets motion again, the brakes are good to go.
The issue is there with the brakes only when the AC is turned on. So, i think it is some power distribution issue, but am not sure.
Also, just to add, when the car starts from halt(zero speed) with A/C turned on , the pick is almost zero and i have to turn the A/C off to get it running.
Kindly if some experts can help me out here and perhaps refer me to some reliable person.