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2026
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03
Why does it shake when braking?
All of us truck drivers know that the main function of the brake wheel cylinder is to use air to push the brake shoes, thereby performing braking. As a key component in the braking system, the role of the brake wheel cylinder is extremely important.
However, nowadays many car enthusiasts, in order to pursue better and quicker brake response performance, will independently modify an external relay valve with increased air flow. The advantage of increasing air flow is that gas can pass through the brake caliper, pushing a stronger force onto the brake pads, thereby producing faster and more powerful braking effects.
On the surface, this modification seems seamless, but blindly increasing the air volume in pursuit of better braking performance actually disrupts the original balance of the car. First of all, the brake shoes and brake drums are designed according to the air pressure of the original factory vehicle. Long-term use of high air pressure to drive the wheel cylinders can lead to abnormal wear of the brake drums and brake shoes, which can result in brake vibration and component damage in mild cases, and in severe cases, cause the brake shoes to burn, the brake drums to crack, and brake system failure.
At the same time, if the secondary valve's air flow increases, it may also cause an imbalance in the air pressure of the brake slave cylinders on both sides, leading to asynchronous operation. One side's slave cylinder may have excessive air pressure while the other side's is too low. Even when pressing the brake, the braking force on the wheels on both sides can differ significantly. In this situation, brake vibration can also occur.
Therefore, whether it is a trailer or a tractor, drivers should never easily modify the brakes in pursuit of shorter distance or faster response. Whether it is the brake slave cylinder, brake shoe, or brake drum, after modifying the brakes, these parts will endure much greater pressure than originally designed, greatly increasing the risk of sudden part failure and vehicle loss of control.
● Editor's Note
In addition to the reasons mentioned above, there are actually some other factors that may cause brake vibration, such as tire or wheel out-of-round conditions. During braking, the vehicle's center of gravity may shift toward the out-of-round wheel. At the same time, if there is excessive play between the ball joints and the kingpin in the steering system, vibration may also occur during braking. However, the position where the vibration occurs and the intensity of the vibration can often be roughly identified by many service technicians at repair stations.
Although brake vibration may seem like a minor issue, both vehicle manufacturers and service stations are making efforts to investigate abnormal vehicle vibrations during the vehicle design and development stages as well as in later maintenance. Meanwhile, if truck drivers experience brake vibration in their own vehicles, it is important to contact the service station immediately to thoroughly address the cause and avoid further complications.
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