HBBHydraulic Brake Boost
Provides brake-pressure boost when conventional assistance is limited or unavailable.
Standards
- ISO 26262 development path
- Vacuum-independent design
- EV/HEV compatible
- Electro-hydraulic pump
System overview
Hydraulic Brake Boost (HBB) is a braking assistance system that uses hydraulic fluid pressure to amplify the driver’s braking force, making it easier to stop with less pedal effort. Unlike traditional vacuum boosters, HBB draws pressure from the power-steering pump or a dedicated electro-hydraulic pump, so it works independently of engine vacuum — reliable in forced-induction engines and functional even when the engine is off. This makes it especially useful for hybrids and EVs, offering quicker assist and a more compact package than vacuum-based boosters.
Hydraulic pressure amplification instead of engine vacuum
Reliable operation with forced-induction and engine-off states
Quicker assist and smaller footprint than vacuum boosters
Well suited to hybrid and electric powertrains
Technical profile
Capabilities and technical values are program-dependent and must be confirmed against the applicable OEM requirements, vehicle architecture and validation plan.
Problems it solves
- Solves weak brake assist when engine vacuum is limited or absent.
- Delivers consistent boost across combustion, hybrid, and EV states.
- Frees packaging space compared with a vacuum booster.
Typical applications
- Hybrid and electric vehicles without steady engine vacuum.
- Forced-induction engines with reduced vacuum availability.
- Compact platforms needing a smaller brake-boost package.
Technical profile
- Power source
- Power-steering or dedicated electro-hydraulic pump
- Independence
- Operates without engine vacuum, even engine-off
- Fit
- Optimized for hybrid and electric platforms
- Trade-off
- More components; may emit a faint pump hum
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