| CPC B60T 11/326 (2013.01) [B60T 17/02 (2013.01); B60T 17/18 (2013.01)] | 20 Claims |

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1. A braking sub-system comprising:
a first air reservoir coupled with a first braking circuit of a vehicle;
a second air reservoir coupled with a second braking circuit of the vehicle;
an air supply reservoir coupled with the first and second air reservoirs; and
a backup air supply reservoir coupled with the first and second air reservoirs via a valve, wherein the valve is configured to provide air from the backup air supply reservoir to whichever one of the first and second air reservoirs contains air under a higher pressure.
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