Thu Aug 03, 2006 4:26 pm
I'm pretty sure that the 70 series dual-tone vehicle sirens were the smallest Federal sirens that had brakes - the 60 series and down didn't. As of the early '70s that meant that the Q, C, and 70 series Federals had brakes and thus "coasted."
The Sterling 30 had a brake, but I don't know if the 20 did. There were Sireno sirens and Dietz sirens with brakes, but I don't know the details.