Simple air horn install - Mercedes-Benz Forum
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post #1 of 1 (permalink) Old 04-11-2019, 09:24 AM Thread Starter
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Date registered: Dec 2018
Vehicle: 1981 Unimog U1300L - ex German Military
Location: Glasgow, Scotland
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Simple air horn install

Once I had discovered an existing glad hand coupling at the front of my U1300L, I decided that would be the simplest way to fit an air horn, without the need for an additional electric compressor or air tank.
I couldnít find a maximum operating pressure for an air horn but figured 18bar was likely to be on the high size and fitted a pressure reducing valve where the non return valve used to be. Iíve set the PRV to 10 bar which seems more than adequate.

I replaced the front glad-hand coupling with a PCL Airflow coupling for tyre inflation or similar.

There are a few small air leaks on some of the fittings so when I get a chance Iíll add a liberal quantity of PTFE tape to all threads.

In the cab Iíve added a compact 2-way switch to enable switching between the standard electric horn (required for annual UK MOT test) and the air horn.

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