
The slack adjuster sits outside the drum, between the pushrod and the camshaft.
📄 Digital PDF book · read on your phone or print
The compressor and governor, spring brakes, slack adjusters, the gauges, the in-cab air brake check, the trailer air lines and the seven-step pre-trip. Find the part where it sits on the truck, read three short lines, and the psi reading or inch limit is in a box right beside it. 66 pages in 9 parts.
Price US$ 27 US$ 63
🔒 Secure checkout · PDF by email · 30-day guarantee
Sources: 49 CFR Parts 383, 393 and 396, the FMCSA and the AAMVA model CDL manual
Look for the part where it sits on the truck, then the boxed note beside it: the psi, the inch, the order of the steps.








These are real pages from the book. The table of contents is the full one: 9 parts and 62 topics.
Know the order the air moves the parts, and you know the order to name them.
It's your pre-trip. You're down at the wheel, light on the brake chamber, and you have to name each part out loud, from the pushrod to the drum.
Most people try to recall the paragraph from the manual. Pushrod, then… slack adjuster? Camshaft? Somewhere in the middle the order slips, and a part gets skipped or named in the wrong place.
The S-cam page shows the six parts in the order the air moves them: pushrod, slack adjuster, camshaft, S-cam, shoes, drum, each one drawn where it sits on the axle.

Every page ends with a note box like these: the mix-up the exam counts on.

The slack adjuster sits outside the drum, between the pushrod and the camshaft.

Service = braking signal from your pedal. Emergency = the air supply that keeps trailer brakes released.
Price US$ 27 US$ 63
From the tests you'll take and the learner's permit, through how the air system is built, the brakes at the wheel and the gauges, to the in-cab checks, braking on the road, trailer air and the full pre-trip, ending with every number and the classic test traps.
At the end of the book: Every number on one page, the classic air brake test traps and a page on saying the pre-trip out loud
Never driven with air brakes? Start with From Compressor to Wheel and follow the air from the compressor to the tanks to the brake chamber before you read a single rule.
When cut-in, cut-out and the low air warning run together, Every Number on One Page lines them up: cut-in about 100, cut-out about 125, and the warning before the tanks drop below 60 psi.
Run the in-cab check in its numbered order and rehearse the walkaround with Saying the Pre-Trip Out Loud, so the order is the same on test day as it was at home.
Price US$ 27 US$ 63

Check yourself on air brakes, gauges and the pre-trip, and read why each answer is right, so you know what to review before the real test.

The whole walkaround in the order you'll say it out loud on test day, ready to print and keep in the cab.
📄 This is a digital PDF book sent to your email: nothing is printed or shipped.
PDF by email: We email you CDL Air Brakes and Pre-Trip as a PDF, together with the two free books. It's a single payment: no installments, no extra charges.
Try CDL Air Brakes and Pre-Trip for 30 days, bonus books included.
We refund everything if the file won't open, if the book isn't what you see here, if you were charged twice or if the email doesn't arrive. Just email us.
You pay once. No subscriptions.
The book and the two bonuses come as PDF files by email. You can open them on your phone, tablet or computer.
Yes. You pay once, with no subscription and no recurring charges.
No. ELDT from a provider listed on the FMCSA Training Provider Registry is required before your first Class A or B skills test. This book doesn't count toward ELDT, doesn't come with a certificate and doesn't replace your state's manual or a qualified driver beside you. It's a study book to understand and rehearse what you're practicing.
From 49 CFR Parts 380, 383, 392, 393 and 396, the FMCSA and the AAMVA model CDL manual that state manuals are based on. Where a number can vary by state, the page says so.
Yes, in any state, for Class A or B. The air brake rules and the core numbers come from 49 CFR and the AAMVA model manual that state manuals are built on: the 150 psi safety valve, the low air warning that comes on before pressure drops below 60 psi, the leak rates. Where state manuals can differ, like the governor numbers or which version of the in-cab check they use, the page flags it so you check your state's manual and use its number on the test. The trailer and fifth wheel pages are for Class A; everything else applies to both.
Keep the manual: it's your official reference. This book takes the same topics, shows each part where it sits on the truck, puts the psi or the inch in a box and numbers the checks in the order you'll run them on test day.
Yes. You can print the whole book or only the pages you need. The Pre-Trip Checklist is laid out to print and use at the truck while you practice. On test day you'll say the pre-trip from memory, so rehearse with it until you don't need it.
It covers the same topics, so it works alongside your school, not instead of it. It's for the nights in between: the air system, the in-cab checks and the walkaround on paper, in a fixed order. If your instructor teaches the walkaround in a different order, keep your instructor's order and use the pages to make sure every item gets named and checked.
You have 30 days. We refund everything if the file won't open, if the book isn't what you see on this page, if you were charged twice or if the email doesn't arrive: just email us.
It's a PDF: read it on screen or print it
One book, one page per topic and 30 days to try it.
Start with the first page.
One-time payment: US$ 27 · Guarantee: 30 days · PDF by email
I want CDL Air Brakes and Pre-Trip for US$ 27📄 This is a digital PDF book sent to your email: nothing is printed or shipped.