When winter comes, the Internet gradually see the netizen feedback their trailer brake cooling because of the weather is slow, the relay valve is frozen, resulting in brake locking, security. Today, I have worked out some solutions to check and maintain the winter braking system. I hope I can bring some help to my friends in the winter drive.

When winter comes, how can the trailer brake system be maintained?

First, check the gas path connections (including the main vehicle and trailer connections)

With the arrival of winter, the temperature dropped lower and lower, and the seal or cushion is relatively hard, after a summer of wind and rain, sealing rubber ring is getting worse, especially above the axle pipe joints, the winter low temperature will cause the sealing pipe joint contraction, leakage and poor sealing performance, so we in the morning before cheer is sure to check the gas way of each joint seal. (the best one by one hand will shake, touch) such as leakage timely tighten or reinstall.

Two. Check the main car drying pot

Check main car dryer tank to ensure that main air is dry and free from moisture. Because the drying tank is an air filter, the filtration effect on the residual water vapor in the compressed air is lost with the use of time. The compressed air does not achieve the purpose of drying, resulting in water and ice in the pipe and the valve body, thus affecting the normal use of the brake.

Three, the main vehicles and trailers regularly discharge water

In winter, the temperature is below zero, then just out of the compressed gas is prone to water or wet gas, the main vehicle and the trailer cylinder regular water, regular water in winter is shorter than the time interval between the summer, often put water, make sure the brakes use dry gas. If the water is not in time, the gas pressure inside the reservoir will enter the valve body. When the temperature is below zero, it will cause the inner part of the valve to freeze. Cause the piston in the valve to block and the brake finally fails.

4, ABS system maintenance ABS connection with multiple sensor connector, it is for the brake system for ABS sensing signal, it will give some instructions on the specific speed of the vehicle, play the best braking intensity and frequency. Therefore, the sensor joints are loose, to ensure the fixed, need to check and maintenance.

At the same time, brake drum ABS ring gear to regularly remove clean, to ensure a good tooth ring and the probe sensing signal, joint putty.

Common relay analysis on relay valve

1 、 the working principle of the relay valve

The running valve of Baotou North heavy truck parts belongs to the brake system of the automobile air brake. In the braking system of the truck, the relay valve shortens the reaction time and pressure, and establishes the time. The relay valve inlet is connected with the air storage tank, and the air outlet is connected with the brake air chamber.

When the brake pedal is depressed, the output pressure of valve as the control input pressure valve, the control pressure, the air intake valve open, then the compressed air by the air reservoir directly through the inlet into the brake chamber, without passing through the relay valve, which greatly reduces the gas pipeline brake chamber the acceleration of the inflation process of the gas chamber. Therefore, the relay valve is also called acceleration valve.

2, why the relay valve will be frozen?

Normally, the following causes the relay valve to be frozen:

1. Baotou North rush heavy truck accessories spiral heat pipe is too short, when compressed air from the air pump into the storage tank, the temperature can not be reduced to 65 degrees celsius. Compressed air due to high temperature cold, contains too much water, into the valve to produce water, the temperature below zero, resulting in icing. Cause the valve to die.

2. because the drying tank lost the filtering effect on the residual water vapor in the compressed air. The compressed air does not achieve the purpose of drying, resulting in water and ice in the pipe and the valve body, thus affecting the normal use of the brake.

3., the reservoir does not regularly discharge water, causing the storage tank internal water, with compressed air into the valve body, when the temperature is below zero degrees, resulting in the body of ice. 3, after the valve is frozen, how to do?

When the relay valve is frozen when the card friends often choose to use fire, boiling water poured into the reservoir, add alcohol and other methods, but these are only a matter of expediency, if improper operation will cause damage to the valve and pipeline, to fundamentally solve the problem you can try the following several ways:

1. before the winter should be the body of the maintenance work, and smear a small amount of Vaseline in the valve body, lubrication helps the body of the piston.

2. check Baotou North rush truck spare parts storage tank, whether there is water, do regular discharge, if the water is too much, should consider drying tank replacement.

3. check whether the compressed air in the storage tank can get good heat dissipation. If the compressed air is too hot, the length of the spiral pipe should be extended.

Note: driving in winter in the north will encounter many problems, temporary maintenance freezing extremely uncomfortable, the relay valve is an important part of vehicle braking, usually must be ready for inspection, good maintenance, avoid.