Vehicle & Equipment · Driver Training VideoBrake Stroke & Slack-Adjuster Check
Brakes can feel fine while pushrod stroke runs past the limit and stopping power quietly disappears. Drivers learn to measure stroke at a charged, applied brake, because automatic slack adjusters do not fix every cause of bad adjustment.
Branded with your logo & company nameWhat drivers learn
Every air brake has a pushrod. When you step on the pedal, air pushes that rod out of the brake chamber, and the slack adjuster turns that push into the rotating force that clamps the brake shoes onto the drum. The distance the rod travels is called the stroke.
Almost every truck on the road today has automatic slack adjusters. They're designed to take up slack on their own, every time you brake. That does not mean you skip the check.
Here's the check: with the air system fully charged and the truck secured, have a partner apply and hold the brakes — full pressure, not a tap. Watch each pushrod. Mark it at the point where it exits the chamber unapplied, then again at full application, and measure that distance.
Your company standard: any brake found out of adjustment gets written up and fixed before that truck leaves the yard — not noted and driven anyway. One out-of-adjustment brake is a defect.
Brakes are consistently the number one reason trucks get placed out of service at roadside inspections — more than any other system on the truck.
FMCSA regulations this training supports
Assign it after a roadside inspection to coach the exact issue and document corrective training.
Sample quiz questions
3 of the 10 questions drivers answer after the video. Quizzes run in the driver's own language.
- The pressure inside the brake chamber
- The rotational force applied to the drum by the slack adjuster
- The distance the pushrod travels when the brakes are applied
- The wear rate of the brake lining
Show answer
The distance the pushrod travels when the brakes are applied
- The brakes will fail completely and the pedal will go to the floor
- The air system will automatically shut down
- The ABS warning light will illuminate immediately
- The truck can still roll to a stop, but not where the driver expects
Show answer
The truck can still roll to a stop, but not where the driver expects
- Lining wear
- A bent pushrod
- A seized clevis pin
- A brake chamber that's failing
Show answer
Lining wear
How fleets use this training
Pick Brake Stroke & Slack-Adjuster Check and send each driver a personal link by email, or copy the link and text it yourself.
Drivers watch on their phone and answer the quiz in their own language. No app, no login.
They sign on screen and get a certificate with your logo. Every completion is saved for DOT and insurance.
Train your drivers on Brake Stroke & Slack-Adjuster Check
Included in the Full Library plan ($129.99/mo, unlimited drivers). Unlimited drivers, cancel anytime. Prefer to own it? Order it branded for $4.99, one time.
Frequently asked questions
How long is the Brake Stroke & Slack-Adjuster Check training video?
About 3 min. Drivers watch it on their phone from a personal link, then take a 10-question quiz.
Is there a quiz and a completion certificate?
Yes. Every driver takes a 10-question quiz in their own language, signs on screen, and gets a completion certificate with your company name and logo. Records are saved for DOT audits and insurance.
Which FMCSA regulations does it cover?
It supports training for roadside violations including Brakes out of adjustment (§393.47).
Which languages is it available in?
Ready today in English. You can also order it branded in any other language for $2.99 per extra language.
How much does it cost?
Included in the Full Library plan ($129.99/mo, unlimited drivers). You can also order this video branded with your logo and company name in the voiceover for a one-time $4.99, yours to keep.