VolvoBrake Parts

3987121 Brake Booster 1St Axle — Volvo FMX FE Series trucks — FH400

This is a brake booster for the first axle of Volvo trucks, which amplifies the force applied to the braking system. It is manufactured to precise specifications, ensuring consistent and reliable braking assistance compared to a worn booster that may feel less responsive. Operators might experience a harder brake pedal, reduced braking performance, or a hissing sound from the booster when it begins to fail.

Brake Booster 1St Axle – Part No 3987121 – Volvo Spare Part
Part Specifications
BrandVolvo
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 TypeBrake Booster
MaterialAluminum and steel
ApplicationFirst axle brake system
Service LifeReplace every 4,000 hrs or as needed
CompatibilityVolvo FH, FM, FMX, FL, FE Series
ConditionNew — OEM specification aftermarket

Failure Symptoms

A failing brake booster may initially result in a noticeably firmer brake pedal requiring more effort to apply. If ignored, this can lead to significantly reduced braking performance, especially during emergency stops. The primary risk is an increased stopping distance, compromising vehicle control.

Installation Tip

Ensure the vacuum or hydraulic lines are clean and free of leaks before connecting them to the new booster. Do not apply excessive force when mounting the booster, as this can damage the diaphragm.

Service Note

Inspect the master cylinder and brake lines for leaks or damage when replacing the brake booster.