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November 1, 1995 Service bulletin

Excessive operating noise from the hydraulic brake booster pump

Porsche technical service bulletin GRP4/9506 for 1996 Porsche 911 and 1996 Porsche Carrera.

Bulletin number
GRP4/9506
Component
Service brakes, hydraulic: power assist: vacuum
Summary
Excessive operating noise from the hydraulic brake booster pump. To reduce the operating noise from the hydraulic brake booster pump, a damper (arrow, figure 1) can be installed between the pump and the brake system accumulator.

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