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Old 08-11-2014, 07:54 PM   #15
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Asking for help , knows no bounds or forums , there are members everywhere willing to help.
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Old 08-11-2014, 08:51 PM   #16
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Originally Posted by JVitto View Post
No bad fuses, let it run for a while this time and still does it, fluid looks good, still seems to brake good too. Am I over worrying.....
Yes..
The system is operating the way it is supposed to... You have power brakes, the power assist is normally provided by the hydraulic pressure from the power steering pump. If you were driving and the engine quit, the power steering pump would no longer assist the brakes. The electric pump would come on to assist your brakes and so would the light to let you know the backup electrical pump was running.
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Old 08-12-2014, 07:07 AM   #17
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Asking for help , knows no bounds or forums , there are members everywhere willing to help.
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And they have!! I can't thank the men n woman of the forum enough.
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Old 08-12-2014, 07:14 AM   #18
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Yes..
The system is operating the way it is supposed to... You have power brakes, the power assist is normally provided by the hydraulic pressure from the power steering pump. If you were driving and the engine quit, the power steering pump would no longer assist the brakes. The electric pump would come on to assist your brakes and so would the light to let you know the backup electrical pump was running.
Ok, the electric pump is coming on because it's simulating a stalled engine when the key is off and the engine isnt started. You know I have sat in that car with the key off many many times and never noticed that noise but now I'm thinking, did I ever step on the brake? I thought so but maybe not. But now that I understand the system better ...I Want to hear the pump come on, this way I know it is working and will come on if my engine stalls out. I can't thank you enough!!
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Old 08-12-2014, 08:03 AM   #19
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Have you started the engine yet ?
Could be a low pressure warning in the hydro-boost system telling you that your almost out of assist for braking and it will reset once the engine runs.
If still on after 30 seconds of engine run time ; do not move the coach.
Shut off the engine and check all system fuses, you may have blown a fuses while hooking up the electrical of the CB.
Quote:
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The humming could be the system has an electric pump back up for assist, and the light is a warning to say you're braking on a back up system , use caution and stop the vehicle.
Skip
My dash "brake warning light" comes on, an electric pump motor runs and a warning buzzer sounds if/when the service brakes are applied when the engine is not running.
It is the "backup brake booster system", (in case the hydraulic brake booster pump, belt or hoses fail, or the engine dies while the coach is moving).

On my coach it is also normal for the light to illuminate, the backup motor to run, and the buzzer to sound, if the brake pedal is held/applied/depressed when the coach is stopped/parked/idling and the engine is shut off....(in fact that's the "recommended testing procedure" for my "backup brake booster system").
Mel
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Old 08-12-2014, 11:50 AM   #20
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Consider--
In an automobile with power brakes, the booster is normally engine vacuum and if the engine quits, a vacuum canister will give you a few "assisted" applications of the brakes. After that vacuum is gone, you still have brakes although without assist it is much harder to apply the pedal..

The HydroMax/ Hydro Boost has hydraulic pressure to assist braking forces, without that pressure (usually the power steering system) you would have no brakes...( or steering assist)...That is why you have the backup hydraulic pump which will supply brake pressure as long as you have battery power. Designed to allow you to safely stop the vehicle, not to continue operation. If you exhaust the battery you are back to dragging your feet.....

Does not apply to air brakes...
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Old 08-13-2014, 05:12 AM   #21
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I just never steeped on the brakes while the engine was off then. I completely understand the system. In my 2000 F350 when the engine is of so are my brakes. I have have to deal with that a few times.
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