Bludot

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Relay Valves 1

A relay valve speeds up brake application and release on a trailer air brake system. Instead of sending all the brake air from the tractor down a long line, the control signal tells the relay valve to release air from the trailer's own air tank straight to the brake chambers, so the trailer brakes keep pace with the tractor.

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Bludot 1.5 PSI relay valve

Our 1.5 PSI air relay valve is built to OEM standards for trailer straight air brake systems. When replacing a relay valve, match the pressure rating and port configuration of the original so trailer braking stays balanced with the tractor.

Signs a relay valve needs replacement

  • Slow brake application or release on the trailer
  • Air leaking from the exhaust port with the brakes released
  • Trailer brakes dragging after release

Browse all straight air brake parts, including air hose and fittings, or contact our team with questions.