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Brake master cylinder cap

2K views 4 replies 3 participants last post by  dp0099  
If you are talking about the rubber insert which is on the underside of the reservoir cap, that is normal for it to be pulled down. It gets pulled down as the brake fluid is drawn through the reservoir by normal braking. I also did my brake fluid flush in the last month or so and was surprised at how dirty the strainer was.

I had done the first flush just about 3 years earlier and it was also dirty at that time. I don't believe dirt is getting in, I just think it is normal for the fluid to leave a dirty looking residual. My car has 57000 miles, is a 2019 model, and this was the second brake flush I did and everything is operating as it should. I just push the rubber lip back into place and then put the cap back on. I have always used the Honda brake fluid.