That ZF parking brake has been used on F53 chassis sense 1988. It's a shame that many owners don't know about it. When it leaks, it don't take long for those 4 oz. of ATF to disappear and destroy the assembly. What really sucks is when it runs dry, it sometimes welds it's self to the transmission out put shaft and a transmission replacement is necessary. 17mm socket, 6" extension and ratchet to remove the plug.
Thanks for bringing it to our attention.
95 Bounder 32H F53
460/528 Stroker Engine