Master brake pump - The device that drives the transmission of brake fluid.
The brake master cylinder belongs to the single acting piston type hydraulic cylinder, and its function is to convert the mechanical energy input by the pedal mechanism into hydraulic energy. The brake master cylinder is divided into single chamber and double chamber, which are used for single circuit and double circuit hydraulic brake system respectively.
In order to improve the safety of the car, according to the requirements of traffic regulations, the service brake system of the car is now a dual-circuit brake system, that is, a dual-circuit hydraulic brake system composed of a series of double-chamber master cylinders (single-chamber master cylinders have been eliminated).
At present, almost all dual-circuit hydraulic braking systems are servo braking systems or power braking systems. However, in some miniature or light vehicles, in order to make the structure simple, in the case that the brake pedal force does not exceed the physical range of the driver, there are also some models using a double-loop human-hydraulic brake system composed of double-chamber brake master cylinders.
Common causes of brake master pump failure
Common causes of brake master pump failure include poor brake fluid quality or containing impurities, air entering the master pump oil cup, wear and aging of the master pump parts, frequent vehicle use or overload, and master pump manufacturing quality problems.
Signs of master brake pump failure
Signs of brake master pump failure include:
oil leakage : Oil leakage occurs at the connection between the main pump and the vacuum booster or limit screw.
slow brake response : After the brake pedal is pressed, the braking effect is not good, and a deeper step is required to obtain the desired brake response.
vehicle offset during braking : Uneven braking force distribution of the left and right wheels causes the vehicle to offset during braking.
Abnormal brake pedal : The brake pedal may become hard or sink naturally after being pressed to the bottom.
sudden brake failure : in the process of driving, one foot or successive feet of the brake are stepped on to the end, the brake suddenly fails.
unable to return in time after braking : after pressing the brake pedal, the vehicle starts or runs with difficulty, and the brake pedal returns slowly or not.
The solution to the fault of the main brake pump
For the failure of the brake master pump, the following solutions can be taken:
Replacement of high quality brake fluid : Ensure that the brake fluid is of good quality and is cleaned and replaced regularly.
exhaust : Check the main pump oil cup to ensure that no air is entering, and exhaust if necessary.
replace the worn and aging parts : replace the worn and aging parts of the main pump to ensure good sealing performance.
Avoid overloading and frequent use : Reduce the pressure on the main pump to avoid overloading and frequent use.
Professional diagnosis and repair : professional diagnosis and repair as soon as possible to ensure driving safety.
Replace the piston seal or entire brake pump : Replace the piston seal or entire brake pump if the piston seal is broken or there is too much air in the brake oil line.
Preventive measures for brake master pump failure
In order to prevent the failure of the brake master pump, the following measures can be taken:
regular maintenance : Regular maintenance of the car, check the status of the brake pads and brake discs, to ensure that the thickness of the brake pads is sufficient.
Use high quality brake fluid : Ensure that you use high quality brake fluid and avoid using inferior or expired brake fluid.
Avoid overloading and frequent use : reduce the load on the vehicle, avoid frequent use of the brakes, and reduce pressure on the brake system.
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