When turning off the spindle, the braking system is no longer working. I replaced the re-gen resistor as that was what FADALCNC.com told me would fix it. Nope.

When turning off, it free spins, then lurches like you hit the brakes, but only for a half second, then free spins some more and lurches slower, and does that about 3-4 times and eventually free spins to a stop.

It's a DC, 1993 machine with an Advanced Motion Controls spindle driver.

Any suggestions would be awesome.
thanks
Jon