I have a strange problem in my car's braking system, i have a cultus 2011 model, recently i have changed the brake pads to nippon & polished the disc, now whenever i applied brakes the first pedal is ok but after 2 to 3 pedals the brakes got loose, mostly happens in morning, seems like brake looses the vacuum.
i have tried 2 different brake boosters and master cylinders but no difference, there is also no sign of fluid leaks and also bleed the air 2 times & flush complete lines.
Please gurus help me, as this became very difficult to stop the car in traffic jam, and in morning when brake applied for 2nd time, first pedal is 100% ok, car suddenly stops on first pedal, but there is no brake on 2nd pedal if applied immediately, pedal not dropped, not hard, vacuum pipe is original & also ok.
Problem only occurs on CNG + AC, no problem on petrol + AC and only on CNG.
Xulfiqar bhai plz help