What is the “TSSSS” sound a bus or a truck makes? 980 viewsJanuary 3, 2024 Question92.14K August 22, 2020 0 Comments edit: Solved. Thanks guys In: Engineering 19 Answers ActiveNewestOldest Anonymous Posted August 22, 2020 0 Comments A lot of heavy vehicles rely on air pressure to actuate their braking systems. The “tsss” is excess air being released by a pressure regulating valve. You are viewing 1 out of 19 answers, click here to view all answers. Register or Login
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