This is an exhaust brake valve, a crucial component in the air braking system of Volvo trucks and buses, designed to assist in slowing the vehicle by restricting exhaust flow. It is built to withstand high temperatures and pressures within the exhaust system, ensuring reliable braking assistance, unlike a seized or leaking valve which compromises braking performance. Operators may notice reduced braking effectiveness, a noticeable loss of engine braking power, or audible leaks from the exhaust system when this valve fails.
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Flush hydraulic lines before fitting new components. Use only manufacturer-specified hydraulic fluid. Check O-rings and backup rings for correct orientation. Bleed air from system after installation.
Always consult the OEM service manual for model-specific torque values and procedures. WhatsApp our technical team if you need fitment guidance.
The first symptom is often a reduction in the engine's ability to provide braking assistance, requiring more use of the service brakes. If ignored, the exhaust brake may cease to function entirely, significantly increasing wear on the service brakes and reducing vehicle control on descents. This can lead to overheating of the service brakes and a higher risk of brake fade.
Ensure all mating surfaces are clean and free of old gasket material before installing the new valve to ensure a proper seal. Tighten the mounting bolts evenly in a star pattern to prevent distortion of the valve body.
Inspect the air actuator, control linkage, and associated air lines for leaks or damage when replacing the exhaust brake valve.