VolvoEngine Parts

21019159 Relay Valve — Volvo FH12 FH16

This relay valve is a crucial component within the vehicle's braking system, controlling the application and release of air pressure to the brake actuators. It is manufactured to precise tolerances using durable materials to ensure consistent and reliable braking performance, unlike a worn valve that may stick or leak. Operators may notice delayed brake response, uneven braking, or the parking brake not releasing properly when this valve begins to fail.

Relay Valve – Part No 21019159 – Volvo Spare Part
Part Specifications
BrandVolvo
CategoryEngine Parts
ConditionAftermarket — OEM Specification
DispatchSame-day from Mumbai (before 3 PM IST)
GST InvoiceAvailable — all orders
Export DocsCommercial invoice, packing list, COO

Compatible Models

Always verify with serial number before ordering.

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Installation & Application Notes

Cross-reference part number with serial number before ordering to confirm fitment. Keep original parts until new ones are confirmed correct. Record part numbers replaced for future reference.

Always consult the OEM service manual for model-specific torque values and procedures. WhatsApp our technical team if you need fitment guidance.

Part TypeRelay Valve
MaterialAluminum Alloy, Rubber Seals
ApplicationAir Braking System
Service LifeReplace based on inspection and performance
CompatibilityVolvo FH12, FH16, FH 420, FH 460
ConditionNew — OEM specification aftermarket

Failure Symptoms

The most common initial symptom is a noticeable delay in brake application or release. If ignored, braking performance can become inconsistent, and the parking brake may not fully disengage. Continued use with a faulty relay valve poses a significant risk to vehicle control and safety.

Installation Tip

Ensure all air lines are properly identified and connected to the correct ports on the new valve to avoid incorrect air pressure application. Do not force connections; ensure they are seated correctly.

Service Note

Inspect all air brake system lines for leaks and check the condition of the brake chambers and slack adjusters when replacing the relay valve.