In a dual air brake system, which parts of braking does each system typically operate?
One system operates the brakes on the rear axle/axles and the trailer; the other operates the regular brakes on the front axle (and possibly a rear axle).
One system operates the brakes on the front and rear axles; the other operates the brakes on the trailer (and possibly a rear axle).
One system operates the brakes on the rear axle/axles; the other operates the regular brakes on the front axle and the trailer.
One system operates the brakes on the rear axle/axles; the other operates the regular brakes on the front axle (and possibly a rear axle), both supply air to the trailer.
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