You may have a vacuum leak at the brake booster. Have the brake booster inspected.
How to change brake lines on a 1991 Buick Lesabre?
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who knows i have the same question
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It is important to know the cost of replace the parts of a car while owning it. The average cost to replace brake pads and rotors to a 1992 Buick LeSabre as a kit would be about $300.
How to repair brake lines on a 91 buick
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Check www.autozone.com, they have a Repair Info section that covers Buick LeSabre with this info.