I recently did a conversion on a '50 Merc with a '66 Nova clip drum to disc conversion from Classic Performance Products. The car stops much better, but I am getting a weird vibration and sound upon hard braking that I can only describe as if there are offroad tires on the car....that knobby rubber sound and feel. The car has about 400 miles since the conversion and I was hoping it would dissipate on break in but the symptoms are not receding.
Did you surface the rotors with a rotor conditioning disc or some 120 grit sandpaper before you seated the pads?
Seating the harder metallic pads seating on a freshly machined new rotor can cause little heat checks that will act just as you describe upon a hard stop.
It is recomended that all new rotors with an "as machined" finish first get cleaned with brake cleaner, then get a slight roughing of the braking surface, either by a glaze breaker disc designed for the job, or some type of abrasive paper, then cleaned again with brake cleaner.
The pads need to be washed as well, as ioil from your fingertips will contaminate the surface and cause a crappy break in.
Later, mikey
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