If I depress the service brakes, parking brake engaged, and put the bus in either D or R, a "buzzer" in the dashboard sounds... on/off, not constant........If I depress the service brakes, release parking brake, put the tranny in either D or R, no "buzzer".....No idiot lights, all gauges reading ok, my VMSPC program shows all good, no logged codes...Allison, Freightliner and my buddy who was a National RV Tech all say "I got nothing......"I'm confused..... Any ideas?????Maybe the previous owner installed a buzzer to warn of driving with parking brake engaged?????2001 National Tradewinds, 37'DP, CAT 3126B, Allison 3060, Freightliner chassis

The buzzer is a warning that you have parking brake engaged with vehicle in gear. If you put foot on brake and shift to neutral buzzer will go off warning you that you don't have parking brake engaged.

mvpmich wrote:The buzzer is a warning that you have parking brake engaged with vehicle in gear. If you put foot on brake and shift to neutral buzzer will go off warning you that you don't have parking brake engaged.X2. Sounds like your system is working correctly. My rig does the same. Freightliner with Allison.

It sounds like it is working like my Freightliner chassis, except that my buzzer stays on constant, not " on/off, not constant........". Maybe a difference in model years or your buzzer is getting worn.Fred

I was hoping to get an answer to my buzzer as well....except mine buzzes when I depress the brake pedal when the ignition is off and key is out, or when I first turn the key without cranking the engine or touching the brake pedal. I don't know for sure as I haven't tracked it down, but I think there was a TOAD brake system installed prior to my ownership and this may be an air compressor of sorts that I'm hearing? There is what appears to be an air connection on mine just above the hitch. And, there's an actuator of some sort mounted to the floor underneath the brake pedal with a switch that gets pushed when I push the pedal.

Strange "Buzzer" | Good Sam Community

K_Charles
Explorer
Nov 09, 2016
Good idea
mvpmich
Explorer
Nov 09, 2016
The buzzer is a warning that you have parking brake engaged with vehicle in gear. If you put foot on brake and shift to neutral buzzer will go off warning you that you don't have parking brake engaged.
gsf35099
Explorer
Nov 09, 2016
mvpmich wrote:
The buzzer is a warning that you have parking brake engaged with vehicle in gear. If you put foot on brake and shift to neutral buzzer will go off warning you that you don't have parking brake engaged.

X2. Sounds like your system is working correctly. My rig does the same. Freightliner with Allison.
fcooper
Explorer
Nov 09, 2016
It sounds like it is working like my Freightliner chassis, except that my buzzer stays on constant, not " on/off, not constant........". Maybe a difference in model years or your buzzer is getting worn.

Fred
10forty2
Explorer
Nov 09, 2016
I was hoping to get an answer to my buzzer as well....except mine buzzes when I depress the brake pedal when the ignition is off and key is out, or when I first turn the key without cranking the engine or touching the brake pedal. I don't know for sure as I haven't tracked it down, but I think there was a TOAD brake system installed prior to my ownership and this may be an air compressor of sorts that I'm hearing? There is what appears to be an air connection on mine just above the hitch. And, there's an actuator of some sort mounted to the floor underneath the brake pedal with a switch that gets pushed when I push the pedal.
wolfe10
Explorer
Nov 09, 2016
10forty2,

Could also be a hydroboost for the coach service brakes. Have someone depress the brake pedal while you look under the coach at the brake master cylinder. If present, it is a safety system so you would have brake boost in the event of engine failure.
usersmanual
Explorer
Nov 09, 2016
Pass42 wrote:
If I depress the service brakes, parking brake engaged, and put the bus in either D or R, a "buzzer" in the dashboard sounds... on/off, not constant........
If I depress the service brakes, release parking brake, put the tranny in either D or R, no "buzzer".....
No idiot lights, all gauges reading ok, my VMSPC program shows all good, no logged codes...
Allison, Freightliner and my buddy who was a National RV Tech all say "I got nothing......"
I'm confused..... Any ideas?????
Maybe the previous owner installed a buzzer to warn of driving with parking brake engaged?????
2001 National Tradewinds, 37'DP, CAT 3126B, Allison 3060, Freightliner chassis

as previously noted here its supposed to do that my 2008 isl sparton does exactly the same thing warning your in gear with park brake on
Pass42
Explorer
Nov 09, 2016
OK - except the buzzer/beeper does not stop... we drove for 8 hours today with the on/off beeper noise coming out of the dash...no beeper in neutral, however, beeper in D or R... parking brake off... everything else is normal...
I was thinking maybe seatbelt warning... never put on Nationals
at a loss as to what else... maybe a bad connection/loose wire in parking brake alarm circuit????
wolfe10
Explorer
Nov 10, 2016
Pass42 wrote:
... maybe a bad connection/loose wire in parking brake alarm circuit????

A possibility.

Contact your chassis maker (likely Freightliner) with your VIN. They can tell you want to check.
Tinstar
Explorer
Nov 10, 2016
Mine does that and Brett Wolfe answered with the correct 'answer' as to what mine is.

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