29-03-2018, 09:38 AM
Friction material manufacturers keep their formulations a closely-guarded secret so it's hard to give a generic and definitive answer to this question. I'd cast an eye over them and discard in the event that they show obvious signs of deterioration such as cracking or crumbling. For normal A7 type use I imagine they'd be fine, if they are clean and oil-free. Replacing bedded with unbedded linings is a clear step backwards.