SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/cdl-parking-brake-knob

On newer trucks, what does the parking brake control look like?

A yellow, diamond-shaped push-pull knob.

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  1. A yellow diamond-shaped knob ✔
  2. A red eight-sided knob
  3. A green round button

Why: Pull the yellow diamond knob out to put the spring brakes on, and push it in to release them. Use the parking brakes whenever you park.

Huh, didn't know that: On older trucks it may be a round blue knob or a lever.

The dad joke
Why did the parking brake get the best seat? It always holds its spot.
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References

Answer: A yellow diamond-shaped knob. Pull the yellow diamond knob out to put the spring brakes on, and push it in to release them. Use the parking brakes whenever you park.

  1. California Commercial Driver Handbook (DMV) www.dmv.ca.gov/portal/file/california-commercial-driver-handbook-pdf
    you put on the parking brakes using a diamond-shaped, yellow, push-pull control knob.
    Checked 2026-10-10.

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