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Old 05-10-2016, 09:41 PM   #1
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What is this noise!?

So we are complete newbies when it comes to MHs. We have only taken ours out for a few trips around the neighborhood and plan a short inaugural trip this weekend.

However.....our girls were in the MH last week when they came out saying there was a "noise". And, no, they did not do ANYTHING. Yeah.

Anyway...we could not figure out what caused the noise and we also noticed the brake lights were on. And then the engine battery completely drained.

We jumped the battery, everything seemed OK. And then we took the MH for a test ride. We turned off the ignition and, SAME noise, SAME lights and SAME battery drain. (when the key is not in the ignition?)

I know this is probably something stupid, but, as I said, we are SO new to this. We recorded the noise and a video showing what we think is causing the sound.

Any thoughts on what is going on? THANKS!
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Old 05-10-2016, 09:51 PM   #2
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Sounds like the brake pump.
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Old 05-10-2016, 09:56 PM   #3
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Grab hold of the brake pedal and pull it up. There is a switch on the brake pedal that energizes the pump when the ignition is off. The same switch puts the brake lights on. When the engine is running the brakes are powered by the power steering pump.
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Old 05-10-2016, 10:00 PM   #4
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That is the emergency back up pump, it supplies power brake function if the engine quits running. It should only run with the key on, engine off and brake pedal applied. I think you have a relay frozen on.
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Old 05-10-2016, 10:02 PM   #5
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Originally Posted by 92TNTRacing View Post
That is the emergency back up pump, it supplies power brake function if the engine quits running. It should only run with the key on, engine off and brake pedal applied. I think you have a relay frozen on.
Which would, I assume, cause a battery drain as well?

Any clue how this would happen? Could the girls have caused the problem by hitting the brake pedal when they were in the coach? Or maybe hit something else? Of course, there were no keys in the ignition at the time. But that may not matter.

We have literally had this coach for less than 2 weeks. So quite a bummer, unless it is an easy fix?
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Old 05-10-2016, 10:06 PM   #6
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Which would, I assume, cause a battery drain as well?

Any clue how this would happen? Could the girls have caused the problem by hitting the brake pedal when they were in the coach? Or maybe hit something else? Of course, there were no keys in the ignition at the time. But that may not matter.

We have literally had this coach for less than 2 weeks. So quite a bummer, unless it is an easy fix?
I would try like others have said and pull the brake pedal up with your hand, if it turns off, then the switch behind the pedal needs adjusting, if not just like others have mentioned could be a relay
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Old 05-10-2016, 10:10 PM   #7
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Doesn't need the key.The switch is on the brake pedal lever- a small micro switch . When the brake is pushed the switch closes and puts power to the brake lights and the pump.
Check and see if both wires are attached to the switch--one may have been dislodged in the cleaning process. If you can't find the problem disconnect the starting battery under the hood.
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Old 05-10-2016, 10:14 PM   #8
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We have literally had this coach for less than 2 weeks. So quite a bummer, unless it is an easy fix?
Umm, if that's all that goes wrong consider yourself VERY LUCKY!!

I've been RV'ing since 1957 and there's ALWAYS something that needs fixing.
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Old 05-10-2016, 10:16 PM   #9
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When I was installing trailer brakes, I tapped into the wrong wire (too small) and they melted. There's a black plug up there with 3 or 4 wires in it. Maybe others can chime in. Isn't there a spring on the brake pedal?
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Old 05-11-2016, 11:18 AM   #10
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Thanks all - we pulled on the brake and it stopped. So that means we need to adjust the switch? Not exactly sure how to do that but we will look a little later and see what we find.
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Old 05-12-2016, 08:18 AM   #11
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And this issue has also solved the question on why our cruise control doesn't work! During a test drive, the cruise would work as long as you pulled on the brake pedal...and then it would turn off as soon as you let go.

Still haven't figured out if it can be fixed by us or if we need to take it in.
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Old 05-12-2016, 08:24 AM   #12
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I don't know this but maybe there was a spring on the brake pedal up high under the dash that came off or broke? Could something like that fix it?
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Old 05-12-2016, 08:33 AM   #13
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Thanks all - we pulled on the brake and it stopped. So that means we need to adjust the switch? Not exactly sure how to do that but we will look a little later and see what we find.
Look at the switch, it should be adjustable, just a mater of backing off a nut, and tightening another one
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Old 05-13-2016, 03:46 AM   #14
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Another possibility?

The master cylinder is often at 90 degrees to the pedal requiring a bell crank and the vertical pin to this can become sticky. Some do have a grease nipple, for obvious reasons but some don't.
Access is typically under the hood.
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