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Lion Yard Trading
Mercedes-Benz · Brakes

Brake servo / vacuum booster

The large round drum between the pedal and the master cylinder that uses engine vacuum to multiply your foot pressure.

Also called brake booster, servo.

How you know it is this

  • A very hard pedal that needs both feet, especially with the engine running
  • A hiss from behind the pedal when you brake
  • The engine stumbling or idling rough when you press the brake

Worth knowing before you buy

  • A hard pedal is the servo or its vacuum supply. A soft pedal is hydraulic — the two faults are opposite and are often confused.
  • Check the vacuum hose and its one-way valve first. They are a fraction of the price and fail far more often.
  • On modern diesels and small turbo petrols the vacuum comes from a separate pump, not the inlet manifold.

What we need to quote it. The chassis number settles the generation, the body and usually the engine in seventeen characters — it is on your mulkiya. A photograph of the old part helps where there is more than one version.

Servo / vacuum boosterVacuum pumpFluid reservoirMaster cylinderHard brake pipeFlexible hose
Master cylinder, servo and lines — schematic, to show where the part sits. Arrangement is right; it is a diagram and not a fitment reference.

Rest of the calipers and hydraulics

All brakes parts
Get in touch

Brake servo / vacuum booster for your Mercedes-Benz?

Send the chassis number and a photograph of the old part. We come back with genuine, OEM and aftermarket options priced side by side, with lead times.

Mon–Sat, 8:00 AM – 6:00 PM · +971 54 303 3119 (Operations Director) · +971 54 241 0599 (Managing Director)