Air Brake Test W/o Chocks?

I asked the tester if he wanted me to use chocks he said no. When I do my airbrake test, I put the truck in great to prevent it from rolling.

In a manual sure.... But an auto? Our testers insist on it.

You have to chock an automatic. By design the transmission will auto shift into neutral to prevent damage. Say you pull into the fuel island and set your brakes but do not shift to neutral. The transmission will automatically switch to neutral. This will happen if the engine is on or off. It is a safety feature by design.

I asked the tester if he wanted me to use chocks he said no. When I do my airbrake test, I put the truck in great to prevent it from rolling.

In a manual sure.... But an auto? Our testers insist on it.

That's why I said I wasn't sure if you're allowed to do it that way for the test.

You have to chock an automatic. By design the transmission will auto shift into neutral to prevent damage. Say you pull into the fuel island and set your brakes but do not shift to neutral. The transmission will automatically switch to neutral. This will happen if the engine is on or off. It is a safety feature by design.

Yes, but with the valves pushed in and it set to drive it won't roll if the truck is turned off.

Yes, but with the valves pushed in and it set to drive it won't roll if the truck is turned off.

My truck does. I tried it.

You're probably missing something. It works for me in Volvo's, internationals, Kenworths and peterbilts.

I'll lay out the steps I take

1) fully charge the air system

2) turn the truck off

3) turn the key to the on position

4) push in the service brake and then push in the valves

5) with the service brake still pushed in, put it in drive.

You should see it change gears on the instrument panel in the dash and it won't roll.

I just tried it again, following the exact steps you laid out. It still rolled. Maybe it's just a cascadia thing. I've never driven anything else.

I just tried it again, following the exact steps you laid out. It still rolled. Maybe it's just a cascadia thing. I've never driven anything else.

Could be.... I've never driven a cascadia, but since it always works I assumed it was universal. Guess not. So you have to chock your wheels every time you do a brake test?

This has been bugging me, so I pulled over to check one other possibility. Switching the transmission to manual mode still had no effect whatsoever, the truck still rolled.

So you have to chock your wheels every time you do a brake test?

Yup, unless on level ground or against a curb.

Gotcha

I wonder how the test went....