Q: Brake system issue! Sometimes severe.

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Have brake pedal free travel issue usually after driving at hi-way speeds for 2 or more hours. More severe in hot whether like 80D. Free travel seems to increase by 1 in. +/-. Brakes are not spongy when this happens, but for quick response slow downs or stops it is a big issue with the unsuspected free travel of pedal. Dealer cannot find problem. Normal free travel measured about 1.25in.+/-. Never drove a vehicle with such poor brakes. Had unit from new, but did not experience until driving long trips on hi-way. When it gets bad, it is like feel when a fluid line breaks. Only have about 12K miles on it now. Never smelled hot pads or felt hot rims etc.

My car has 12000 miles.
My car has an automatic transmission.

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