Citroen SM Workshop Manuals
If you wish to conduct adjustments to your Citroen SM then it is always recommended to have a Workshop Manual to keep just for a reference in the event you want to know how you can take off a certain part such as the Wheel Bearing and fit it again the right way.
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Citroen SM Workshop Manuals gives you specified diagnostic guides on your car so if something is broken it can help you find out what the situation is and the best way to resolve it. After that you can assess if this can be achieved by yourself or in case the job is just too big you could make a reservation for your SM in with a nearby mechanic.