Era: Starting from the local police station

"Of course, it's when there's no oil pressure in the brake lines, at that time..."

Yang Shaogang was suddenly stunned.

At this moment, Guo Yong turned around and said, "Deputy Director Jin and Deputy Director Jiang, it's the return spring inside this brake drum."

Jiang Zhenghua quickly asked, "Can you tell if the brakes have ever locked up?"

"It definitely didn't die, otherwise I could smell a burning odor right now..."

Guo Yong froze, swallowing back what he was about to say, and stared intently at the brake drum.

Jin Hong's eyes lit up: "Comrade Guo, when will the fuel line be free of pressure?"

Xiao Li replied, "Deputy Director, one is when you don't apply the brakes; the other is when you do apply them, but the master brake pump malfunctions."

Cheng Mingli said, "On such a steep downhill road, it's impossible not to use the brakes. The problem must be with the main pump."

"I'll open it and take a look."

Guo Yong moved his body quickly as he spoke.

Jiang Zhenghua took a deep drag on his cigarette and said, "Now I understand why the damaged reset spring not only didn't break, but also fell off."

Everyone looked at him.

"The return spring must have been engaged initially, otherwise the brakes would have locked up and the tires would have stopped turning. At the moment of turning, the master cylinder malfunctioned, the oil line suddenly depressurized, and the brake shoes, which were already stretched, suddenly sprang open. This caused the spring, which was not properly secured, to break off instantly and fall out from the gap."

Jiang Zhenghua continued, "That's most likely what happened. In an instant, the car stopped braking completely, like a runaway horse, almost flying off. Gu Youliang couldn't react in time and was thrown out. He should have reacted. He gripped the steering wheel tightly with both hands and slammed on the brakes, but it didn't work. This explains why he was facing the steering wheel until he died, and why his spine was deformed."

At that moment, Guo Yong suddenly poked his head out of the driver's seat: "Deputy Director Jin, Deputy Director Jiang, there's a situation here."

The group quickly went over.

Jiang Zhenghua wrinkled his nose and asked, "Why does it smell like alcohol? Didn't you say Gu Youliang doesn't drink alcohol?"

"That's the problem. Someone added alcohol to the master cylinder. This stuff corrodes the rubber cups and seals inside. At room temperature, it's fine and won't cause too much of a problem."

Guo Yong paused for a moment, then said slowly and deliberately, "If you keep the brakes on for a long time, the oil temperature will rise, which will accelerate the corrosion of the piston cups and cause the master cylinder to depressurize instantly."

Jiang Zhenghua frowned and said, "This master pump is connected to the four branch pumps, so why didn't we smell any alcohol before?"

Guo Yong said with a wry smile, "When the vehicle fell, the bottom oil pipe broke, and all the oil in the four sub-pumps spilled out. By the time we arrived, the alcohol had all evaporated. The only reason we can smell it now is because I opened the master pump tank cap, and that's when the slight smell of alcohol left inside came out."

Jin Hong exclaimed, "Good heavens. They're practically afraid he won't die, so they've put up a double insurance policy!"

Jiang Zhenghua shook his head and said in a deep voice, "This is both a double insurance and a way to cover up any signs of human intervention, creating the illusion of an accident. This is the real first killing move. Comrade Guo, where do you usually start when inspecting a car?"

Guo Yong said, "First, we test the brakes. If there is no response, the first thing we think of is the master cylinder, and only then will we consider the brake drum."

Jiang Zhenghua nodded: "If you take apart the master cylinder and find no residual hydraulic oil and no smell of alcohol, you'll just assume it's due to corrosion from not replacing the piston cup for a long time, and you'll conclude it was an accident. At that point, who cares about the brake drum? You really won't find any trace of human intervention."

Guo Yong nodded in agreement, "That's right."

Jiang Zhenghua looked at the corpse not far away: "The reset spring was just because the other party was afraid it wasn't safe. What if the leather cup was newly replaced and the corrosion wasn't enough? That's why it was destroyed. The other party was just making sure that Gu Youliang had to die."

Yang Shaogang exclaimed, "How vicious!"

Everyone nodded in agreement.

Jin Hong nodded: "The case is clear now. But how did they determine that Gu Youliang would definitely send a truck?"

Geng Jianwu said, "Deputy Director Jin, this is actually very easy to do."

Cheng Mingli and the others all turned to look at him.

He said unhurriedly, "Anyone familiar with the relationship between Gu Youliang and Zhang Hegui knows that if one of them is in trouble, the other will inevitably be asked to fill in."

Jin Hong's eyes lit up: "It seems we need to question Zhang Hegui more carefully."

Cheng Mingli nodded.

Jin Hong turned to Jiang Zhenghua: "Is there anything else you need to know?"

Jiang Zhenghua shook his head: "That's all."

Jin Hong then said, "Section Chief Cheng, how about we have the security team clean up the mess here?"

Cheng Mingli replied, "No problem, I'll have Yuan Hua take five people to handle it."

Jin Hong said to Liu Baojia, "Liu Baojia, go and find Coach Zhang, and then make the reservation..."

Cheng Mingli said, "Seven people."

Jin Hong continued, "This meal is enough for seven people; the others can eat at home."

Liu Baojia responded, "Yes."

Cheng Mingli said to Ma Qiang, "You and Lu Shuxiong stay here to dismantle the operation. I'll have Yuan Hua bring people to assist."

Ma Qiang responded, "Yes, I guarantee I will complete the mission."

Jin Hong said to Guo Yong, "Comrade Guo, you've worked hard. Come out and wash your hands, have some water, rest for a bit, and then we'll go back to Beijing together."

Guo Yong waved his hand: "It's nothing hard. This trip was worthwhile. When I teach in the future, I can tell my colleagues to pay attention to the main pump cover when getting on the bus, so that no one can tamper with it."

As he climbed out of the driver's seat, he said, "This case is definitely worthy of being included in a lesson plan. It looks like an ordinary traffic accident, but there are so many intricacies hidden inside."

Fang Ya's eyes lit up as she looked at Jiang Zhenghua: "Deputy Director Jiang, now that this case is closed, could you give me a copy of the case file?"

Before Jiang Zhenghua could speak, Jin Hong quickly agreed, "No problem, I will definitely send you a detailed report after the case is closed."

"Then I'll thank Deputy Director Jin in advance."

Just as everyone had loaded the body onto the truck, Zhang Chongguang and Yuan Hua returned.

On the way back to Beijing.

As Jiang Zhenghua sat in the back seat of the jeep, he saw the security personnel standing on the truck in front and suddenly remembered something.

He leaned forward and asked Cheng Mingli, who was sitting on the other side, "Section Chief Cheng, isn't there someone in your security section surnamed Hu who has a black mole on his neck?"

Cheng Mingli, sitting in the middle, leaned back: "We have two people in our department with the surname Hu. Do you know any other distinguishing features?"

"Around 1.7 meters tall, in his thirties, with fair skin."

"This man is from the security team, his name is Hu Youshan. What happened to him? Could it be that he also..."

Jiang Zhenghua nodded emphatically: "According to the information provided by the villagers of Houjia Village, this person should be involved in the case. If he is on duty at the gate, Hou Laicai and others would often not register when they come and go."

Cheng Mingli's face immediately turned ugly, and he sighed, "I didn't expect this. Even Hu Youshan, who usually performs admirably, got involved. I've really failed in my duty. This security team is utterly rotten."

Jin Hong glanced at him: "With Deputy Team Leader Qi Ronggen leading the way, it's easy to win over the people below."

Cheng Mingli's expression turned serious: "I will arrange for reliable personnel to keep a close eye on him."

Jiang Zhenghua nodded: "Was last night's inspection fruitful?"

Cheng Mingli shook his head: "No, at least there are no obvious problems with the warehouse. We need to investigate the accounts discreetly to find out everything."

Jin Hong said in a deep voice, "Section Chief Cheng, judging from the fact that Gu Youliang was silenced, the other side has become aware of the situation. We can proceed slowly, but we must not provoke them."

Cheng Mingli nodded: "I will be careful."

Upon entering Fuchengmen, the jeep stopped.

Zhang Chongguang and Cheng Mingli quickly jumped out of the car.

The two returned shortly afterward.

Cheng Mingli said, "Zhang Hegui took leave after returning from our staff hospital today and is at home now."

Zhang Chongguang continued, "Surname Qiao and the others are at the Yu'er Hutong Police Station. Hu Decai has taken the bait and is being questioned right now."

Jin Hong looked at Cheng Mingli: "Section Chief Cheng, the two people involved are related to your factory. Don't go back to the machinery factory yet, let's go and take a look together."

Cheng Mingli nodded: "Okay. Comrade Li, catch up with the truck ahead and tell them."

Xiao Li quickly shifted gears, and the Jeep sped forward.