Season 4 Episodes8
Cast2

David Sparks
Heavy D

David Kiley
Diesel Dave
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A new client asks for the biggest build yet: a monster school bus capable of driving over sand and water. Later, the Muscle brings in his own client build for a gym buddy, a Raptor-style F250.

David Sparks
Heavy D

David Kiley
Diesel Dave
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"Big Bro Bus" is episode 1 of Diesel Brothers season 4. It aired on July 30, 2018.