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1999 Mack E7 350HP, Jake Brake issues

whskypete

By whskypete
in Engine and Transmission

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Vmac3 Rising Star

Vmac3

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On 8/21/2022 at 9:18 PM, Quanbigrig said:

A guy that know the trucks did the adjustment ,he been working on it since 06 and did the last adjustment a couple years ago .He said I should get new solenoid but I don’t keep spending money if it’s not going to fix the problem 

Its going to be money and time with my experience. If the checks that Joey suggested don't have an answer then you will need to invest some time and money. Disconnect the power leads to the jake heads and supply a fused switched 12V to each head. Drive the truck and get it hot. Apply your switch and see if they work. If they dont then you may have an oil pressure problem, a hardware problem or both. If they do then it may be an electrical issue.

V

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