Question

What extra step do you need to complete when checking the brakes on a double/triple trailer that you do not have to do on other combination vehicles?

Accepted Answer

None. The steps for checking the brakes are the same (as long as air is checked at the rear of the rear-most trailer).

Answer

Test the service brakes.

Answer

Test the emergency brakes.

Answer

Check that air flows to the first trailer.

Question 20 - Doubles/Triples Test Practice Test for the CDL