Problem
A vacuum leak is occurring at the seal around the actuator rod between the brake booster and master cylinder. This results in a hissing noise while the engine is running, which persists until the vacuum is exhausted after the engine is turned off. Replacing the seal is preferred over replacing the entire brake booster assembly to avoid a more involved repair.
Solution
Replace the brake booster actuator rod seal.
Relevant Parts
- Seal Part Number (Potentially Compatible): 47275-12020 (Check compatibility with your specific model and year.)
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