hydrovac isn't "air assist" and doesn't "operate fully or partially on the air brake principle", there are no air chambers or slack adjusters involved, all hydraulic fluid

Bill


Moved over to the Passing Lane

"When we tug a single thing in nature we find it attached to the rest of the world" John Muir
"When we tug a single thing on an old truck, we find it falls off" me
Some TF series details & TF heater pics & Rust-a-holics Unanimous parking lot