I was losing pressure in my brake pedal yesterday, and the brake pedal seemed spongy so i thought I had air in my system. I went to bleed the brakes and found that there was brake fluid all over my driverside front wheel well and my brake line was leaking at the copper crush washer seal. So I replaced it an did a ops check and it was fine. But i was just wondering with only 20k on the clock what would cause that copper seal to go?