ABS accumulater may fail on Buick Park Avenue

The ABS accumulator may fail causing loss of power brake assist. (The brake pedal will become very hard).
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Average mileage: 120,000 (120,000–120,000)
2 model years affected: 1991, 1994
3 people reported this problem
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problem details
brake pedal very hard and sounds like a semi trucks air brakes