my brake pedal is stiff when my car is not running . when i start it the pedal, when pushed goes right to the floor
Either the master cylinder is bad or you have a leak in the break system.
Master cylinder, if you had a leak the pedal would drop even with the car being off.
someone with a similar problem traced it to the vacumn booster for the brakes.
The car would have to be running. Then if the brake booster is bad the brakes will get stiff.
Looking for a Used LeSabre in your area?
CarGurus has 1,709 nationwide LeSabre listings starting at $899.
Search Buick LeSabre Questions
Buick LeSabre Experts