I had a 1964 Chevrolet L60 LCF, that had air over hydraulic brakes, & it would literally throw you into the windshield, when doing a panic stop. Had great stopping power, but parts were not readily available.

Spanky Hardy
Collector Of Fine Old G.M. COE Trucks & Antique Holmes Wreckers

1948 Chevrolet 5700 COE Holmes HD W35 Wrecker
In the Stovebolt Gallery
More pictures on Photobucket

1950 GMC 250 1-Ton
In the Stovebolt Gallery