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The tyres lock up with just a light tap on the brakes, what's causing the problem?
A few days ago, a truck driver with an Auman tractor unit came to me, saying that the brakes on his truck were getting worse. The specific issue is that every time he brakes, even a light press stops the trailer immediately, and there's a smell of rubber from the tyres wearing. After releasing the brakes, the vehicle doesn't roll smoothly; it takes a few minutes of effort before it moves normally. Now, whenever he needs to brake, his leg shakes.
After careful questioning, it was found that the car's brakes have always been working properly. This issue appeared about a month ago. The car had been to a brake shop once, where the mechanic said that the trailer valve on the main vehicle was advanced, so a trailer valve was replaced, but the problem persisted and was getting worse.▎After asking, I got on the car to check.It was observed that the trailer tyres were indeed abnormally worn, and very severely.
When checking the trailer brake relay valve, the problem was already very clear: there was thick, fresh yellow rust at the valve's exhaust port.
When dismantling the trailer relay valve, I could clearly hear a slight air leak from the exhaust port. Just as I removed the control port air pipe, a stream of water shot out from the pipe, and water also overflowed from the control port. When taking the valve apart, a lot of accumulated water flowed out from the control chamber.
On further disassembly, it was found that the intake filter of this valve was almost completely blocked by debris.
The valve's exhaust port had a slight leak, so I removed the exhaust port retaining ring, checked the sealing valve further, cleaned the small amount of oxidised particles at the sealing valve opening, and checked that the valve's sealing surface was flat, smooth and undamaged, not affecting further use.
Clean the internal and external impurities of the valve chamber and control chamber, apply a small amount of special grease to all moving parts and O-rings (note, avoid using wheel grease, as it is too thick, moves slowly, and can even jam, affecting performance). After assembling and test-driving, the driver said it felt like the old days!Based on the vehicle's usage and the driver’s feedback, we also replaced the dryer which had been used for over a year (do not use unbranded or substandard dryers), maintained the brake master cylinder, drained water from all air tanks, and the driver was very satisfied.
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