There is nothing surprising in the fact that over time they become rusty and partially destroyed. Do not try to unscrew this fastener by force - you will probably damage it. Apply a generous amount of penetrating liquid to the appropriate nut or bolt (type WD40) and let it soak into the rust. Use a wire brush to remove all rust and dirt from the visible threaded parts of the fastener. Sometimes a sharp blow with a hammer on the nut through a drift can destroy the rust that is between the threads of the bolt and nut. However, when hitting the nut, be careful that the drift does not come off the surface of the nut and damage the threads of the bolt.
When unscrewing a rusted nut or bolt, use a long wrench - this way you increase the applied force; however, never install a long handle on a ratchet wrench, as you may not only damage the return mechanism of the wrench, but also injure yourself. If the bolt or nut does not loosen, try tightening it slightly. If, when unscrewing the bolt / nut, you applied great efforts or damaged its head (its surface), when installing, use the new (new).
As at performance of the majority of procedures described in this Chapter you should lift the car, prepare reliable support. For jacking, use a hydraulic trolley jack. You may also need it to hang some suspension components when performing a particular procedure.
Attention! Under no circumstances should you work under a vehicle supported only by a jack! When raising the rear of the vehicle, do not use the cross beam as a support for the jack arm.