VolvoHydraulic Parts

85135349 — Brake Relay Traction Valve K078420 85135349 For Volvo Bendix Truck  Atr-6

This is a Bendix ATR-6 brake relay traction valve, a crucial component in the air brake system of Volvo trucks, controlling air pressure to the trailer brakes. It is manufactured to meet rigorous safety and performance standards, ensuring consistent and reliable braking response, unlike a worn valve that may leak or activate erratically. Operators might experience delayed trailer brake application, uneven braking, or a loss of air pressure in the trailer brake system when this valve is faulty.

Brake Relay Traction Valve K078420 85135349 For Volvo Bendix Truck  Atr-6 – Part No 85135349 – Volvo Spare Part
Part Specifications
BrandVolvo
CategoryHydraulic 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

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.

Part TypeBrake Relay Traction Valve
MaterialAluminum Alloy and Rubber Seals
ApplicationAir Brake System (Trailer Control)
Service LifeReplace as needed based on air leak tests or performance issues
CompatibilityK078420
ConditionNew — OEM specification aftermarket

Failure Symptoms

The first indication of a failing brake relay traction valve is often a noticeable delay in the trailer brakes engaging or releasing. If the issue persists, the trailer brakes may apply unevenly or not hold pressure effectively, leading to reduced braking performance. The worst consequence is a potential loss of control during braking due to inconsistent or absent trailer brake function, posing a significant safety risk.

Installation Tip

Ensure all air lines are clean and free of debris before connecting them to the new valve. Do not use excessive force when tightening the air line fittings, as this can damage the valve's ports.

Service Note

Inspect all air lines connected to the valve for cracks or leaks, and check the air dryer for proper operation.