Mercury Cougar owners have reported 2 problems related to brake master cylinder (under the service brakes category). The most recently reported issues are listed below. Also please check out the statistics and reliability analysis of Mercury Cougar based on all problems reported for the Cougar.
Complete loss of all brakes due to "never before seen" explosion of abs master cylinder.
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all problems of the 1999 Mercury Cougar
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Master cylinder was defective, causing brake fluid to leak from vehicle. This brake cylinder was replaced, and problem reoccurred.