How to check car brakes? In order to analyze the state of the brake system , 2 methods are used - road and bench. In our article, we will talk about the bench method. The bench method controls the following parameters:
- coefficient of relative unevenness;
- total specific braking force;
- asynchronous actuation of the drive.
Today, in the world of modern technology, there are many varieties of brake system stands. Consider the main ones.
Characteristic
The brake stand for cars is a device placed at the service station, the main purpose of which is to verify the effectiveness of the system. The performance of the equipment is aimed at simulating an asphalt pavement, on which all necessary indications will be taken when braking the vehicle.
The brake system stand can take the form of a stand-alone equipment, or be part of a common diagnostic system. This equipment is applicable for cars weighing up to 3.5 tons.
What is it like?
The brake stand is a kind of platform that is located almost at the floor level in the workshop. The mechanical part is placed under it. A display with the required test readings is a visible part of the equipment.
How does he work?
Passenger transport drives the first pair of wheels onto special rollers imitating the road surface.
The rollers are directly proportional to the electric monitor and sensors, which record the necessary readings:
1. Force measuring force.
2. The frequency of rotation.
3. Indications of braking torque.
The indicated readings are read and analyzed by a specialist, as a result of which certain conclusions are drawn. In addition, there is equipment in the memory of which optimal braking distance indicators are provided. In this case, the sensor will display data that correspond to the specified indicators. The operation of the sensors is based on hydraulics, it is checked by the following method: brake fluid or oil with a low viscosity index is poured into it. A reduced viscosity index is necessary in order for the equipment to work with minimal deviations at subzero temperatures. It should be noted that fluctuations in errors can be about 3%, and the speed of rotation of the rollers can be no more than 10%.
As mentioned earlier, a car runs its wheels onto a brake stand, so that the engine begins to rotate the rollers. As a result of this action, the rotation of the wheels begins, which simulates the movement of a car on a normal road. After a while, the gas pedal is pressed and the machine starts to stop. It is this reactive moment of force that is recorded by the sensors. Moreover, each pair of wheels transmits its signal to the sensor. Further, the operator analyzes the signals and determines the uniformity of braking by each wheel.
Error
Of course, certain allowable discrepancies exist on each wheel.
They are necessarily taken into account by the operator. If they go beyond all the necessary standards, the system instantly notifies you of this fact. Similarly, the braking distance is analyzed by the next pair of wheels. For
all-wheel drive cars, there are other stands where wheel speeds in different directions are taken into account. It is worth noting that the brake stand is capable of measuring the stopping distance not only by the foot method, but also by manual.
Some types of stands provide for determining the force of pressing the pedal. In this case, information on the monitor will be displayed in the form of graphic drawings. Since the equipment is quite serious and it is intended mainly for service stations and serious enterprises, its cost is corresponding. For a brake stand, the price ranges from 500 thousand rubles. up to 900 thousand rubles. It all depends on the country of manufacture and the technical capabilities of the stand.
Roller brake stands
Provide the ability to obtain the most accurate data on the operation of these systems.
When testing a car on roller stands, a study is made of the entire braking surface of the wheel.
Benefits:
- security. This is due to the fact that during testing, the kinetic energy of a given car is zero;
- are the most option for use in service stations.
Parameters defined by the equipment are also displayed. They can be either digital or graphic. It is difficult to judge which information more accurately, since each of them has its own error. It is worth noting that the graphical information output allows you to determine the difference in braking power of the left and right wheels. This provides an opportunity to give an opinion on the condition of the brake system.
Stand for grooving discs
This equipment is designed to restore brake discs without dismantling. Advantages of the stand for grooving brake discs:
- Quick job completion. The maximum time spent on turning one disk is 15 minutes.
- Simplicity in work. A person can work on equipment without special training.
- The end result suggests that the equipment is working perfectly, because the disk looks like new.
- After replacement, the deterioration of new pads is markedly reduced.
- The effect of idle braking is minimized, which helps to avoid unpleasant situations on the way.
- In force majeure situations, the braking distance is reduced.
Features of work:
- adapted for cars;
- simultaneous processing of disks on both sides;
- constant monitoring of operation;
- optional employee qualifications;
- mileage after grinding discs is not necessary: they are completely ready for efficient operation;
- minimization of braking distance;
- elimination of undesirable effects in the form of bonding and grinding;
- steering vibration minimization.
Recommendations for work:
1. When grooving discs, it is advisable to replace the pads.
2. In the event that there was a reusable replacement of the pads, it is impractical to carry out a groove due to the large deterioration of the disks.
3. If the disc thickness is reduced, a complete replacement is necessary.
Break-in brake stand
Its main purpose is to test engines of different power.
The stand is equipped with a measuring system, which during the test process allows you to register all the necessary parameters, as well as provide the test results in the form of a printed protocol. In addition, test information will automatically be transferred to the computer's memory.
The measurement of the necessary parameters, as in previous stands, is carried out using sensors that have an electrical signal. All signals are sent to a computer, the operation of which is monitored by an operator. It is he who will give an opinion on the operation of the engine.
What parameters are controlled by the break-in brake stand?
Several of them should be noted:
- fuel consumption.
- crankshaft rotation frequency.
- torque on the ICE shaft.
The break-in-brake stand consists of:
- Rheostat.
- Electric cabinet.
- Racks.
- Fuel tank.
- Weighing equipment.
- Electrodynamometer.
At present, the production of break-in brake stands is quite limited, while each company that has proven itself is equipped with this equipment, since running the ICE after repair provides the machine with the ability to gain a second life.
At the same time, its resource is 80%. From this it follows that the break-in-brake stand is necessary for every car enterprise.
Conclusion
From the above it follows that it is not necessary to be an avid motorist to understand that you can’t get far without brakes on a car. Therefore, the importance of the described equipment should not be minimized. It should be remembered that the degree of protection of the driver and passengers depends on the effectiveness and quality, operability of this system. Thanks to these stands you have the opportunity to maximize the performance of your brake system for serviceability.
In most cases, passing a stand is part of a vehicle diagnosis. But depending on your desire, it can be used independently.
So, we found out what a stand for grooving brake disks of a vehicle is and what it is used for.