Rust treatment for suspension parts and rear diff?
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In order to do a good treatment you have to remove them and spray or dipped them in rust remove solution, otherwise do it on the car is just wasted your time and money. But you said to replace them with Volvo XC90 calipers and rotor, can you posta picture after it get done?
The front dampers does not seem to be as bad as it looks. It still working perfectly.