CATBrake Parts

2g3537 Valve-Relay — Cat 120g 12g

This relay valve is a crucial component within the air brake system, controlling the application and release of brakes based on air pressure signals. It is manufactured to meet rigorous performance standards, ensuring consistent and reliable brake actuation unlike a worn valve that may stick or leak. Operators might experience delayed brake response, uneven braking, or a loss of air pressure if this valve malfunctions.

Valve-Relay – Part No 2g3537 – CAT Spare Part
Part Specifications
BrandCAT
CategoryBrake 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

Always replace brakes in axle sets. Bed-in new brake pads with 8–10 moderate stops from 40 km/h. Check disc runout with a dial gauge — maximum 0.1 mm. Inspect caliper slides and pistons when replacing pads.

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

Part TypeAir Brake Relay Valve
MaterialAluminum Alloy, Rubber
ApplicationAir Brake System
Service LifeReplace every 5,000 hrs or as needed
CompatibilityOEM specification
ConditionNew — OEM specification aftermarket

Failure Symptoms

Delayed or weak brake application is a common initial symptom of a faulty relay valve. If left unaddressed, the valve may fail to operate intermittently or completely, leading to unpredictable braking performance. The ultimate risk is compromised vehicle control and an inability to stop safely under various operating conditions.

Installation Tip

Ensure all air lines are correctly identified and connected to the appropriate ports on the new valve to prevent incorrect air flow. Do not overtighten the mounting bolts, as this can distort the valve body.

Service Note

Inspect the air compressor, air dryer, and brake chambers for proper operation and leaks when replacing the relay valve.