For shock absorbers, the combination of the front coil spring seat and the coil spring is not appropriate, and therefore, they may interfere with each other. If this problem is left unattended, the coating of the spring may peel, and rust may occur and cause the spring to break. If such breakage occurs, in the worst case, the broken spring and the tyre could interfere with each other, and the tyre could be damaged, which could cause the vehicle to stall.