TO No.16
To perform the inspection, the underbody must be dry so that you can see the leaky areas. Dark areas from moisture suggest a leak.
Check all connection points, as well as the disc brake calipers and drum brake shields, behind which the wheel brake cylinders are located.
The brake hoses should not be wet, swollen or frayed. If they are, they must be replaced.
Brake system pipes have an anti-corrosion coating. If this protective layer is damaged, rust may begin to form. Therefore, you should never clean serviceable brake system pipes with a screwdriver, sandpaper or wire brush.
If the protective layer is damaged, a thin layer of anti-corrosion primer should be applied.
Tubes with traces of rust or that are compressed must be replaced.
Are all bleeder valves protected by protective caps? They are located on the calipers of disc brake mechanisms or inside the shields of drum brake mechanisms.
You can perform an impromptu brake pressure test yourself:
Press the brake pedal with full force.
It should not give in even after several minutes of full load, otherwise one of the cuffs of the main brake cylinder is defective.
Due to the leaky seal, the fluid level in the reservoir does not decrease, but the compressed fluid flows through the piston in the master brake cylinder to the other side, where there is no pressure.
Leaky spots on the piston seals of disc brake calipers and drum brake cylinders can be identified by dark spots on the disc calipers or drum brake shields.
If you are not sure, contact the workshop.