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i would say wheel bearing...... the brakes being on can make the wheel 'move' to a point and then when released the wheel can move freely again, causing a wheel bearing to make a knocking noise...
since your 99 has rear drum brakes....usually there wouldn't be a knocking noise from the brakes..... there's a crap load of springs & a hydraulic cylinder..... but i can't see that it would made a knocking sound audible enough to hear in the cab.....
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1) 2004 IS300 Manual/LSD/Sportdesign 2) 2010 Corolla S 5 speed 3) 1986 MR2 "MK1.22" 5sfe/s54 swap 3) 1995 Ford Explorer 4x4, TT/AAL/custom shackle lift, 31"s
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