How rear struts work
A rear strut is an essential part of a vehicle’s suspension system. Often called a MacPherson strut, it’s similar to a shock absorber, but does more than simply act as a buffer between the vehicle’s wheels and body, protecting occupants from imperfections in the road surface.
A strut does all of that and also forms part of the geometry setup, ensuring the rear wheels are angled correctly for optimum handling and tyre wear.
It’s important to note that most cars have shock absorbers fitted at the rear, rather than struts, but there are exceptions such as the Subaru Legacy and older Honda Civic models. When you change rear struts you also need to have the alignment angles reset because they can govern the caster and camber angles.
Because of this extra feature you normally have to pay more for struts than for shock absorbers.
This task requires some experience. You will need a comprehensive tool kit and the job will take around an hour per wheel, depending on your model.