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Ah, ok. I see now from your picture what you are talking about. Probably for the potential for a fording kit maybe?

If you mean the ones on the rear axles, then that is for the maxi brakes (parking brake). By applying air to those, it releases the spring tension from the maxi (the second air can), and releases the brakes to work as normal. If air pressure is lost, or you remove air pressure (pushing in the...