Hi everyone
I think I may have posted in the wrong area, so here it is
I have a 2018 model Hino FM with the A09C 350hp engine. According to what info I can find, these engines are all fitted with compression (Jake) brakes, and mine is also fitted with an exhaust brake immediately after the turbo. Previous year models were apparently fitted with a multi-stage combination switch to activate auxilliary braking. Mine only as a single stage switch. My truck has had thousands of dollars spent by the previous owner diagnosing and rebuilding the jake brakes, only for them to discover that the jakes don't work with the engine warmed up, only when cold. With a bill of over $8K, they said there is nothing they can do, as the engine has low oil pressure.
I believe the dealer to be wrong based on a couple of reasons.
1. The engine runs beautifully quiet hot or cold, starts perfectly and makes good power
2. The exhaust brake does not work either, except via the "test" button on the dash next to the steering column
The indicator light for the exhaust brake lights and exhaust brake does close when the test button is used, and the indicator light for the Jakes lights up reliably on use of the combination switch, but they do not work when hot.
I believe I will have to at some point pull the rocker cover to verify the mechanical ntegrity of the Jakes myself.
My question is, are there any common causes of what I am experiencing?
All input welcomed
Tia
Dave
I think I may have posted in the wrong area, so here it is
I have a 2018 model Hino FM with the A09C 350hp engine. According to what info I can find, these engines are all fitted with compression (Jake) brakes, and mine is also fitted with an exhaust brake immediately after the turbo. Previous year models were apparently fitted with a multi-stage combination switch to activate auxilliary braking. Mine only as a single stage switch. My truck has had thousands of dollars spent by the previous owner diagnosing and rebuilding the jake brakes, only for them to discover that the jakes don't work with the engine warmed up, only when cold. With a bill of over $8K, they said there is nothing they can do, as the engine has low oil pressure.
I believe the dealer to be wrong based on a couple of reasons.
1. The engine runs beautifully quiet hot or cold, starts perfectly and makes good power
2. The exhaust brake does not work either, except via the "test" button on the dash next to the steering column
The indicator light for the exhaust brake lights and exhaust brake does close when the test button is used, and the indicator light for the Jakes lights up reliably on use of the combination switch, but they do not work when hot.
I believe I will have to at some point pull the rocker cover to verify the mechanical ntegrity of the Jakes myself.
My question is, are there any common causes of what I am experiencing?
All input welcomed
Tia
Dave
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