They are really good. Stop like power discs... never have seen any fade on the street. They seem to work as well or better than the old Velvetouch linings without the destruction of the drums.
Several of my vehicles have Porterfields, one is my old '67 F-250 tow vehicle.
I'm ashamed to tell this story but I drove this truck to Santa Rosa once (over a hundred miles) with the parking brake on... It boiled the silicone fluid out of the master cylinder. I took the park brake off, added fluid and kept going. Later, upon inspection the the wheel cyinders and the axle seals were ruined but the Porterfield linings were fine and still usable!
Brake linings have come a long way in the last few years.
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