Clean the brake lines with a cleaning agent.
Attention: The brake pipes are covered with a layer of polyethylene for protection against corrosion. If this layer is damaged, corrosion of pipelines may begin. For this reason, brake lines must not be cleaned with a wire brush, sandpaper or a screwdriver.
Light the brake pipes from the master brake cylinder to the ABS unit and from it to the individual wheel brake cylinders with a lamp and check. The master brake cylinder is located in the engine compartment under the brake fluid reservoir.
Brake lines must not be bent or twisted. They should not show any signs of rust or wear. Otherwise, replace the entire piping up to the next connector point.
Brake hoses connect the brake pipes to the wheel brake cylinders located on the moving parts of the vehicle. They are made of high pressure material but can become porous over time, swell or be cut with sharp objects. In all such cases, the brake hoses must be replaced immediately.
Bend the brake hoses by hand in all directions to check for damage. Brake hoses must not be twisted (if so, pay attention to the colored control line!).
Turn the steering wheel right and left as far as it will go. In this case, the brake hoses in any position should not touch the parts of the car.
Places of connection of brake pipelines and hoses should not have traces of protruding brake fluid.
Lower the car.