OBD-II code · Powertrain (generic)
P050F Brake Assist Vacuum Too Low
The ECU monitors the vacuum supplied to the brake booster (either via a dedicated sensor or via intake manifold pressure). The level has dropped below the calibrated threshold; brake-pedal feel will be hard, and an electric vacuum pump may be commanded to restore vacuum.
Is it safe to drive with P050F?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyVacuum leak in booster line or check valve
- PossibleElectric vacuum pump weak
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.8–3 h
- Emissions test
- Usually unaffected
- Parts involved
- Brake Booster, Vacuum Pump, Vacuum Check Valve
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.