Diagnostics of the brake system is required in the following cases: pedal blocking or too "hard" pedal, jerking when braking, vibration when braking, deviating from the established route while driving, and untimely activation of ABS. Diagnostics of the brake system includes a visual inspection of the brake lines, pads, discs (drums), checking the integrity of the dust seals and cylinder cuffs, assessing the performance of the vacuum brake booster, checking the brake fluid for moisture, checking the working surface of brake discs, friction linings of brake pads, inspection of cables, assessment of the effectiveness of the parking brake and its components.