Brake oil inspection points：
The brake fluid is stored in a plastic container above the main cylinder. It is not related to the condition of the engine. Under normal circumstances, the height of the brake fluid is higher than the lowest point, but does not have to reach the highest point. Normally the amount of brake fluid varies with the degree of brake pad wear.
It doesn't hurt to add too much brake fluid. But pay attention if you've just replaced the brake pads. Because the new brake pads are thicker, overfilled brake fluid will overflow. Note that brake droplets on the body paint or chassis are highly corrosive. Too little brake fluid does not affect the effect of the brake, but if the brake fluid dry, it will cause the brake pedal to drop, brake failure. If the decrease in brake fluid is not caused by brake pad wear, but by leakage, the brake fluid must be replenished immediately and the car dealer must be asked to repair it.
