Brake Booster
The brake booster multiplies the force of your foot on the pedal, so braking needs less effort.
What is Brake Booster?
Most use engine vacuum; some use a vacuum pump or electric booster. It sits between the pedal and the master cylinder. Diesel and many turbocharged petrol engines do not make enough vacuum, so they use a mechanical or electric vacuum pump. Hybrids and electric cars often use electric brake boosters.
How it works
A diaphragm uses the pressure difference between vacuum and outside air to push on the master cylinder.
Why it matters for your car
A hard brake pedal or a hissing noise can indicate a booster or vacuum problem. A check valve in the vacuum hose keeps the booster charged; if it fails, the first pedal press after starting may feel hard.
Other terms
- Battery Management System (BMS)
- Battery State Of Health (SoH)
- Bumper Cover (Bumper Fascia)
- CAN Bus
- Carbon-ceramic Brakes
- Catalytic Converter Theft
- Cold Start
- Common Rail Injection
- Control Arm
- Diesel Injection Pump (Distributor Or Inline Pump)
- Emissions Test
- Gas Strut (Gas Spring)
- Hall-effect Sensor
- Head Gasket
- Lane Departure Warning
- Limited-slip Differential (LSD)
- Overspray
- RTV Silicone Sealant (Gasket Maker)
- Transmission Control Module (TCM)
- Type Approval