Brake System

what kind of help do you need?? brakes on tractor/trailer are air

 

Why was the school program "shut down"? That's not common or typical. So your blog/story may also not be typical to most.
To explain most of the air brake system in trucks would require far more than a few simple paragraphs.
Too many details to list, and therefore is the reason for typically (on average) 6 week training courses, with a lot of study and hands-on experience involved.

 

I post this every once in a while so here goes.

Read THIS ====>>>> http://www.sgi.sk.ca/pdf/airbrake_manual.pdf

If you get what's in here, then you won't have an issue explaining it.

 

OK, both the "knobs" are also called the "spring brake popout valves".
The red knob is for air supply to the trailer, also known as the emergency line.
The yellow knob is for the tractor air supply and parking (spring brakes).
Pushing them in allows air to be supplied, (yellow to tractor, red to trailer) and will "hold back" the spring brakes so the truck can move forward.
Releasing the knobs (pulling them out) will exhaust all the air to the brake chambers, thus allowing the heavy/strong spring in each brake chamber to activate the parking/emergency brakes.
That's the basics of the yellow/red knobs.

Edit: After I posted, I saw Ridgeline's posting of the SGI Canadian Air Brake Manual.
I highly recommend reading this entire manual, front to back, as I have in the past.
It's an excellent manual that covers the entire air brake system.

 

The red knob is for the trailer supply. The yellow is for the tractor parking brakes. If your truck also has a blue knob you can't ever go into California.

 

blue knob????? never heard of it, and why cant you ever go into CA wiht a Blue knob???

 

Because your truck is too #### old.