I am in the process of changing the rear brake pads on my 1988 300e and I can't seem to get the pad retainers pressed out. I am driving the pins with a punch from the wheel side of the brakes to the center of the car. I am doing it properly, is there any tricks? I sprayed some WD40 on the pins to see if it might free them up.

TIA,
Steve

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1997 E320
1990 Nissan 300ZX Twin Turbo (Stage X+)