ABS accumulater may fail on Oldsmobile 98

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: 90,560 (90,560–90,560)
2 model years affected: 1990, 1991
3 people reported this problem
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brake pedal hard, brakes release slow, have to find good brake mechanic, dont know what to do, will probably be expensive fix