In accordance with clause 1.1 «List of malfunctions and conditions under which the operation of vehicles is prohibited» of the Rules of the Road, the braking distance of the car with a single press of the brake pedal at a speed of 40 km / h should be no more than 12.2 m.
Checking the efficiency of the brake system is carried out on a dry clean horizontal section of the road with a concrete or asphalt surface. The brake system of the car must be tight. The brake fluid level in the reservoir must be at the mark «MAX».
With the engine off, press the brake pedal 5-6 times. While holding the pedal down, start the engine. The brake pedal should move forward. If this does not happen, contact a specialist to troubleshoot the vacuum booster.
Accelerate the car to a speed of 40 km/h. Press the brake pedal to the stop, blocking the wheels, and hold it in this position until the car comes to a complete stop. The front wheels should lock slightly before the rear wheels (it will be visible on the brake track).
Measure the stopping distance of the car with a tape measure. If it is more than 12.2 m, the operation of the braking system is not effective enough.
To eliminate the influence of side effects, the braking distance is checked by accelerating the car in two opposite directions on the same section of the road.