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What causes air loss in the primary reservoir when brake is held down on a air brake system?
Wiki User
∙ 10y ago
You'll have an initial loss of pressure in the primary tank, simply because that air is being used to charge the service chambers of the brake cans... a transmission line to the foot valve (pedal or treadle valve, depending on the mounting) transmits air from the foot valve to a relay valve... that air actuates a plunger which opens up the lines to the brake chambers with air already charged into a feeder line.
If it continues, then you have an leak either in the service chamber of one or more brake chambers, or a leak in the air line somewhere in the primary air system.
Wiki User
∙ 10y ago
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