ABS accumulater may fail on Buick Park Avenue

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