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CDL air brakes and pre-trip: name every part and every number before the examiner asks. every psi reading, every inch limit and the order of every check

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.

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Sources: 49 CFR Parts 383, 393 and 396, the FMCSA and the AAMVA model CDL manual

Real pages

A look inside the pages

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.

Knowledge tests at 80% minimum, then inspection, basic control and on-road.
Knowledge tests at 80% minimum, then inspection, basic control and on-road.
Service, parking, emergency: three brake systems in one air-braked truck.
Service, parking, emergency: three brake systems in one air-braked truck.
S-cam: pushrod → slack adjuster → camshaft → S-cam → shoes → drum
S-cam: pushrod → slack adjuster → camshaft → S-cam → shoes → drum
Supply gauge: one needle per system, normally about 100 to 125 psi
Supply gauge: one needle per system, normally about 100 to 125 psi
The 7 classic in-cab air brake checks, numbered, and the modernized 4-part test version.
The 7 classic in-cab air brake checks, numbered, and the modernized 4-part test version.
Perception 142 ft + reaction 61 ft + brake lag 32 ft + braking 216 ft: over 450 ft at 55 mph.
Perception 142 ft + reaction 61 ft + brake lag 32 ft + braking 216 ft: over 450 ft at 55 mph.
Service line: pedal air to the trailer brakes · Emergency line: fills the trailer tanks
Service line: pedal air to the trailer brakes · Emergency line: fills the trailer tanks
The manual's 7-step inspection: overview, engine, cab, lights, walk-around, signals, brakes.
The manual's 7-step inspection: overview, engine, cab, lights, walk-around, signals, brakes.

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.

Crouched at the drive axle, flashlight on the brake: can you name every part in order?

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.

S-cam: pushrod → slack adjuster → camshaft → S-cam → shoes → drum
Exam traps

Spot the trap before the test does

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

THE S-CAM DRUM BRAKE IN 6 STEPS
p. 19 · THE S-CAM DRUM BRAKE IN 6 STEPSEASY TO MIX UP

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

TWO AIR LINES: SERVICE AND EMERGENCY
p. 45 · TWO AIR LINES: SERVICE AND EMERGENCYEASY TO MIX UP

Service = braking signal from your pedal. Emergency = the air supply that keeps trailer brakes released.

Price US$ 27 US$ 63

I want these pages
What you'll see

All the content, part by part

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.

I

Before You Start: The CDL Tests

pp. 5-9
  • The Tests Between You and an Air Brake CDL
  • Class A or Class B: Which One Are You Testing For
  • The CLP and the 14-Day Wait
  • ELDT: The Training You Need Before the Skills Test
  • The Air Brake Restriction on Your License
II

How the Air System Is Built

pp. 10-18
  • Three Brake Systems in One Truck
  • The Air Compressor
  • The Governor: Cut-In and Cut-Out
  • Air Tanks and Drain Valves
  • Air Dryer and Alcohol Evaporator
  • The Safety Valve: 150 psi
  • The Brake Pedal (Foot Valve)
  • Dual Air Brake System: Primary and Secondary
  • From Compressor to Wheel: The Path of the Air
III

At the Wheel: Foundation and Spring Brakes

pp. 19-25
  • The S-Cam Drum Brake, Step by Step
  • Wedge Brakes and Disc Brakes
  • Slack Adjusters: The One-Inch Check
  • Drums, Shoes and Linings
  • Spring Brakes: Held Off by Air
  • The Parking Brake Control: Yellow Diamond Knob
  • When Not to Use the Parking Brake
IV

Gauges and Warnings

pp. 26-29
  • Supply Pressure Gauges
  • The Application Pressure Gauge
  • Low Air Pressure Warning: Before 60 psi
  • Stop Light Switch and Front Brake Limiting Valve
V

In-Cab Air Brake Checks, in Order

pp. 30-37
  • The Air Brake Check, Start to Finish
  • Air Pressure Build-Up: 85 to 100 psi in 45 Seconds
  • Governor Cut-Out and Cut-In
  • Static Leak Test: Brakes Released
  • Applied Leak Test: Brake Pedal Held
  • Low Air Warning Test
  • Spring Brakes Pop Out: 20 to 45 psi
  • Parking Brake and Service Brake Tests
VI

Braking on the Road

pp. 38-44
  • Stopping Distance with Air Brakes
  • Controlled Braking and Stab Braking
  • ABS: What It Does and What It Doesn't
  • Brake Fade on a Downgrade
  • Snub Braking: Down 5 mph, Then Release
  • Low Air Warning While Driving
  • Warning Triangles When You Stop
VII

Combination Vehicles: Trailer Air

pp. 45-51
  • Two Air Lines: Service and Emergency
  • Glad Hands and Crossed Lines
  • Trailer Air Supply Control: Red Octagon
  • The Tractor Protection Valve
  • The Trailer Hand Valve: Test Only
  • Testing the Trailer Air Brakes
  • Fifth Wheel and Kingpin: What You Must See
VIII

The Pre-Trip, Bumper to Cab

pp. 52-63
  • The Seven-Step Inspection Method
  • Step 1: Overview and the Last Inspection Report
  • Engine Compartment: Fluids, Belts and Hoses
  • Steering System at the Front Axle
  • Suspension: Springs, Hangers and Air Bags
  • Brakes at the Wheel During the Walkaround
  • Wheels, Rims and Tires
  • Fuel Tank, Exhaust, Frame and Doors
  • Lights and Reflectors
  • Inside the Cab: Gauges After Start-Up
  • Cab Controls: Steering Play, Mirrors, Horn
  • Emergency Equipment
IX

Review: Numbers, Traps and Test Day

pp. 64-66
  • Every Number in One Page
  • The Classic Air Brake Test Traps
  • Saying the Pre-Trip Out Loud

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

A different way to learn

The same air brake topics: hunting through the manual vs. finding the number

A text manual
  • You reread the air brake section hunting for the governor numbers.
  • You memorize the pre-trip as one long list and hope it holds.
  • You ask the instructor again what happens when the air drops.
Service, parking, emergency: three brake systems in one air-braked truck.
This book
  • The numbers sit in one box: cut-out about 125 psi, cut-in about 100.
  • The pre-trip follows seven fixed steps, from overview to brakes.
  • The spring brake page shows them coming on between 20 and 45 psi.

Who it's for

I'm starting from zero

I'm starting from zero

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.

I'm in CDL school and the numbers blur

I'm in CDL school and the numbers blur

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.

My skills test is coming up

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

I want the PDF book

CDL Air Brakes and Pre-Trip + 2 bonus books

Bonus 1Practice Questions

«Practice Questions»

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.

US$ 17.90 FREE
Bonus 2Pre-Trip Checklist

«Pre-Trip Checklist»

The whole walkaround in the order you'll say it out loud on test day, ready to print and keep in the cab.

US$ 14.90 FREE

CDL Air Brakes and Pre-Trip + 2 bonus books

  • CDL Air Brakes and Pre-Trip: 66 pages in 9 partsUS$ 63
  • Bonus 1: «Practice Questions»US$ 17.90
  • Bonus 2: «Pre-Trip Checklist»US$ 14.90
  • High-resolution PDF to printIncluded
Total value US$ 95.80US$ 27You save US$ 68.80
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.

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What people ask most

How do I get the book?

The book and the two bonuses come as PDF files by email. You can open them on your phone, tablet or computer.

Is it a one-time payment?

Yes. You pay once, with no subscription and no recurring charges.

Does it replace my CDL school or ELDT?

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.

Where does the content come from?

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.

Does it work for my state?

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.

The state manual is free. Why would I need this?

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.

Can I print it and take it to the truck?

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.

I'm already in CDL school. Isn't this the same thing?

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.

How does the refund work?

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.

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