Many drivers' friends showed that the four rounds of clicks were heard while the vehicle was not starting, but the ABS fault lights often appeared during the driving process, especially at this time of winter. What should I do with this situation? To share with you some ABS common fault cases and maintenance notes.

The composition of the brake system of the trailer

The trailer braking is generally pneumatic braking, and the air source comes from the tractor. First of all, let's take a look at the installation diagram of the trailer's gas path. From the diagram below, we can see that the gas path of the semitrailer is not complicated. There are three main parts: emergency relay valve, Trailer ABS and brake chamber.

When the gas path did not leak due to improper sealing, most of the failures came from these three large parts. Of course, the problem is omni-directional. All parts related to air brake will bring different degrees of impact, so installation time should not be taken lightly.

Two. The installation requirements of air road

Apart from the three large parts, the installation of gas lines is very basic, but if they are not in place, the effect of vehicles will be unsatisfactory. Gas path connection can not be lengthy and unnecessary winding, a qualified gas path is generally simple and clear.

In addition, the internal diameter of the gas pipe and joint inside the gas path must be up to the standard. If not, the braking effect will be poor. The gas path completed according to the requirements is not only superior in braking performance, but also has lower failure rate, and is convenient for maintenance and after-sale in the future.

Three, common fault and treatment method

After understanding the structure of the brake system, let's take a look at the common faults that actually happen.

The brake failures of semi trailers are generally manifested as: air leakage, drag brake, locking, and the following are analyzed separately.

Common fault phenomenon

1: air pressure for a long time is lower than 0.7MPa or trailer driving process appears obvious drag brake phenomenon. The following methods are as follows:

A, change the head and remove the fault of the tractor.

B, through the use of soapy water to check the air leakage source, eliminate the "air leakage in the handshake connection", "pipe joint leakage", "brake gas chamber cross gas", "emergency valve leakage", "Trailer ABS valve leakage" and other possible failures.

If air leakage still exists, it is necessary to check whether the valve body is inflow or can see obvious rust. This phenomenon indicates that the trailer's trachea filter, dry effect is not good, and the body may need to be replaced.

Common fault phenomenon two

The trailer can't start after it is in the car and hold it all the time. It is as follows:

A. first unplug the ABS helix to see if it can start normally to eliminate the circuit problem.

B. makes the tractor be in a state of inflation, unplug the trachea of the hand control valve and check whether the outlet air pressure is normal (the air pressure under the inflating state should be very large).

C. checks whether the parking brake is in the state of release.

D. if there is no problem in the gas path check, the mechanical fault of the axle should be checked. All braking states of the trailer braking system completely keep the gas supply pipeline unblocked on the safety design. The foot brake of the tractor and the parking brake measures are all effective by supplying gas to the control pipeline.Four. The common sense of the daily maintenance of the trailer brake system

1, after the new car is received, it is necessary to check the normal work of the Mercedes Benz accessories ABS in Baotou, to ensure the operation of the car after normal work, and to check the working condition of the ABS before the car is checked every year, so as to ensure the operation of the car after the normal work.

2, regularly replace and clean the drier and filter to prevent damage to ABS in the pipeline.

3, winter every 15 days (summer month) to clean the main car and trailer storage tank of water, especially in the winter must pay attention, otherwise the water ice in the pipeline can not move the valve, a safety accident or impact on the use of performance.

4. Remove the dust or oil from the surface of the sensor and gear ring in time to maintain the axle or replace the brake shoe part of Baotou northern Benz accessories, so as to maintain the cleanliness of the North Baotou Mercedes Benz gear ring or the front of the sensor.

5. When cleaning the axle or replacing the brake shoe each time, after removing the dust or oil from the surface of the sensor, the sensor should be pushed to the direction of the gear ring to ensure that the sensor can contact the gear ring after the wheel is installed. When the wheel is moving, because the bushing is elastic, the sensor will automatically retreat, so as to maintain the best working gap (less than 0.75mm).

6. When replacing or maintaining the sensor, it is noted that the clamping force between the sensor and the elastic bushing is suitable (the clamping force should be 120 to 200N), and the elastic bushing must be replaced in an hour.

7, check weekly ABS wiring harness and gas path whether there is wear, interference, peeling aging, leakage and leakage phenomenon.

8, check and clean up dirt, rust and other dirt inside the plug joints every month.

9, check the ABS regulator and ECU fixed bolts, nuts loosening and tightening in time.

At the end of the day, we should also give special hints to the majority of the friends:

ABS only works when emergency braking causes wheels to lock. The popular saying is that when the ABS works, the driver is fast and frequent "point brake", but the driver's "point brake" frequency can not be compared with the ABS in any case, ABS can achieve 1 seconds to change 3~5 times. When a vehicle equipped with ABS is in danger of emergency braking, it should first step down the clutch quickly, then step on the foot to brake. At the same time, it can still turn the steering wheel to avoid obstacles.

If the ABS light is on during the vehicle running, it indicates that the ABS system is out of order, but the conventional brake still works, and it can still drive the vehicle safely. Now more and more customers are changing their own trailers. Because of the improper modification, the original braking system has been damaged, resulting in many safety and quality accidents. Here, the need to remind the majority of the owners, the purchase of semi – Trailer must choose a regular trailer factory, for example, Hubei Ouyang Hua special car Co., Ltd. is a very good choice!