Problem
Brake pedal is sinking regularly when brakes are applied
![500x370-hydraulics2-DeNoiseAI-standard](https://www.advicsaftermarket.com/wp-content/uploads/2022/09/500x370-hydraulics2-DeNoiseAI-standard.png)
Likely Cause
- Pressure loss due to cylinder piston seal failure
Solutions
- Replace the brake master cylinder
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