I have a 2018 Civic Sport Touring Hatchback I bought in March of 2018 (about 2 years & 8 months ago). I just turned over 13,000 miles on it. I had the first oil change at 3,000 & the second at 8,000 (5,000 later) when the reminder light came on. Some family members with other brand vehicles do theirs at 7,000. The reminder light came on again at 13,000 after another 5,000. The code I got was A7. "A" is for oil change, & I found the "7" was for brake fluid change. Brake fluid? No leaks or low fluid I am aware of. I have never had a vehicle that needed a brake fluid change, much less at the low mileage of 13,000. To be sure I didn't void my extended warranty, I had it done (at the Honda dealer where I bought it) at a cost of around $150 which seemed a bit high, but had nothing to compare to it, since I had never had or needed a change done before. I do nearly all local short trip driving. Does this put extra wear on the fluid? Was this change really necessary, & was that a normal cost to do it?