The brake system requires the utmost care. It is forbidden to operate the vehicle with a faulty brake system. Therefore, every motorist should know the main faults of the brake system and identify them by external signs. In this article, the main failures of the hydraulic service brake system of a passenger car are considered. Every motorist should also be aware of the existence of the service cars for cash near me.
According to the design of the brake system, faults can be conditionally divided into brake mechanism faults, brake actuator faults and brake booster system faults.
The following faults in the disc brake mechanism are distinguished:
Wear, damage or contamination (oiling) of the brake pads;
Wear, deformation, scoring on the surface of the brake discs;
loose mounting, deformation of caliper.
The main brake actuator failures include:
seizure of the service cylinder piston;
brake fluid leakage in the service cylinder;
piston jamming in the master cylinder;
brake fluid leakage in the master cylinder;
Damage or clogging of hoses, lines;
air infiltration in the system due to loose fasteners.
Vacuum brake booster may have the following failures:
insufficient vacuum in the intake manifold;
damage to the vacuum hose;
Failure of the booster tracking valve.
All of the listed faults of the brake system to a greater or lesser extent reduce the braking efficiency of the vehicle, so they pose a danger to all participants of the movement.
Causes of brake system malfunctions are:
violation of the rules of operation of the brake system (violation of service intervals, use of low-quality brake fluid);
low quality of the component parts;
the service life of the system components;
the impact of various external factors.
The onset of failure of the brake system is evidenced by various deviations from normal operation, the so-called external signs of failure, which include:
deviation from the rectilinear movement during braking;
excessive brake pedal travel;
a grinding noise when braking;
squealing, whistling when braking;
loss of pedal force when braking;
Increased pedal force when braking;
pedal vibration during braking (not to be confused with pedal pulsation during ABS system operation);
Low brake fluid level in the reservoir.
Various sensors are used in the vehicle design to facilitate monitoring the condition of the braking system. The results of measurements by sensors of system parameters are displayed in the form of signals of corresponding lamps on the dashboard, readings of the onboard computer. The following brake system warning lights are used on a modern vehicle:
low brake fluid level;
brake pad wear;
faulty ABS system;
Faulty ESP (ASR) system.
To determine the specific faults of the active safety systems, the vehicle’s computer diagnostics are used.