You may want to consider that the Jake brake words best at the higher engine speed. I watch my tach, not the speedometer, and periodically use the brakes to keep the engine from over reeving. The Jake almost always holds the coach except when my heavy tow vehicle is attached, then some, but not much, breaking. Hope this helps.
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2001 Newell #579
tow a 2011 Honda Odyssey
1935 Mercedes 500K replica
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