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In case of tire rust, do not knock with crowbar and hard objects, which will damage the suspension. If the tire can't be unloaded. Again, drop the jack again, take the four bolts again, remember to turn the head back and back two buckles again. It is white that the bolt is not tightened, then the car starts to start with a quick brake, and then the jack is screwed off and the tires fall off easily. In the course of car driving, the tire often has a variety of problems, such as tire burst or wear and so on. At this time, it is necessary to replace the tire. What if you meet a novice and don't change the tire yourself? According to the following steps, you can easily change the tire. Step 1: stop and turn on the warning lamp to stop the car in the safe area, determine whether to pull the hand brake, put the block in front of the front wheel, or plug the rear of the rear wheel to prevent slipping and turn on the warning lights and put the warning signs. Take out the spare tyre and tyre changing tool, and prepare to change the tire. Step 2: the diagonal loosening screw first put the jack on the card position of the chassis bracket, and the screwdriver is twisted in the diagonal form and does not need to be unloaded. If the hand power is not enough, you can step on the shaking hand with one foot and press down with the weight of the whole body, so you can easily release the locked screws. If the nut is too tight, rusty, or for other reasons, it is difficult to unload it. A broken cloth or gloves can be dipped into a little flammable oil, and the nut is ignited and burned at the nut that is hard to wrench, and the nut can be swirled while the wrench is gently wrench. However, this method is limited to urgent use and pay attention to fire prevention. The so-called diagonal form is to select the first screw and twist it loose. The second screws that need to be twisted should be the one diagonal with the first screw. This ensures that the tire is uniformly laid down or loaded to keep the tire balance. Step 3: raise the car body, change the tyre bracket and hooked the jack, and put the hand on the end of the bracket to make the force convenient. Rotate the crank in clockwise direction and lift the tire to the ground with Jack. At the same time, make sure that there is enough space to put the normal inflation tire. The spare tire can be cushions at the bottom of the car to prevent the car from falling suddenly. Jack should be properly clamped, otherwise it may damage the vehicle. Note that if a car is lifted on a soft and smooth floor, a slip mat should be placed below the jack to prevent the jack from sinking or sliding. Step 4: change the spare wheel with the fixed screw in diagonal form, ensure the correct position of the screw, and also fasten all the nuts in the diagonal form with the shake hand. After tightening the screws, you can slowly remove the jack. Step 5: tire pressure test, do well after the tire touchdown, once again use diagonal form to lock the screws one by one. In order to avoid tyres locking when tyres are suspended, the tire will emerge during the driving process. After changing the tire, the tire pressure should first be measured, adjusted to be qualified, and finally pressed by the upper valve cover. Before driving, confirm all the tools, including Jack and deflating tyres, whether they are fixed in the store position and do not lose them on the road. In fact, it is a very simple thing to change the tires, just to pay special attention to a few small details, such as twisting or twisting the screws in the diagonal form, and locking the screws again after the tire is on the ground. As the saying goes, small details lead to big problems. If the owners change their tires, they will have to pay more attention to these details.