The answer to your question is, it depends on the law that is passed. But for you to understand why, you must understand the U. Constitution, intrastate, and interstate commerce. In other words, we learned in law school the feds occupy the whole field of transportation law, and other times, the states will have a say in the matter. You must understand, rather than getting into a detailed history of commerce laws, any laws shipping and transport laws must be tailored, never creating an unreasonable burden on parties affected, not just victims of loud truck engine noise from downshifting, for example. Why is that?
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By mr. Coming down this grade I was in gear, 1,, rpm jake brake on full, using the service brake only to slow a bit more for the 20mph switch-backs. While doing this I noticed for the first time, I am assuming its always been this way that while using the jake brake I was registering pressure on my boost gage. At 2, rpm I was getting a reading of 12 psi on the boost gage, is this normal or am I losing braking power and some how building boost in the engine when I have my foot completely off the throttle? If this is normal, I guess I just never noticed it before, if its a sign of a problem, what could it be?
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TO BRAKES Brakes are mechanical devices that increase the frictional resistance that retards the turning motion that is supplied to the wheels of the vehicle. In a vacuum assisted hydraulic brake system, a constant vacuum is kept maintained in the brake booster using the engine. In a vacuum braking system, vacuum is used for the application of brakes.
Jake braking is a necessary part of wheeler, commercial truck travel and delivery in this country. Truckers and other motorists will use their vehicle's engine to slow their vehicles, preventing significant brake wear, and often essential during cases of severe brake failure. In other words, your engine becomes a sort of auxiliary braking device. But larger, diesel powered commercial trucks, in particular, will benefit most from these engine braking systems. Engine brakes are so important to the trucking industry, that customized engine braking systems were developed over time, including patents filed by Jacobs Brake.