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The minute you open a new bottle of brake fluid, it attracts moisture plus the number of times you open the reservoir cap, and finally the humidity in your part of the world. The other big issue is heat generated by the brakes themselves that can break down the fluid. Over time, the piston seals will wear down and expose the fluid to contamination as well.
I remember a BMW having a specific reminder just for brake fluid service every 2 years/15k I think.
The minute you open a new bottle of brake fluid, it attracts moisture plus the number of times you open the reservoir cap, and finally the humidity in your part of the world. The other big issue is heat generated by the brakes themselves that can break down the fluid. Over time, the piston seals will wear down and expose the fluid to contamination as well.
I remember a BMW having a specific reminder just for brake fluid service every 2 years/15k I think.
Thanks 2GR! I didn't' think about the heat, that makes sense. I get the moisture absorption, but honestly, the only time I ever open the master cylinder cap it when I compress the caliper pistons when replacing pads. That's why I was referring to a 'closed' system...minus the cap opening.
If you want to do a handful of brake fluid reservoir drain-'n-fills to replace the majority of your brake fluid go to a hobby store and buy a RC Nitro Fuel bottle for a $5-6. It has a long, curved, small diameter tube that easily fits into the small necked-down opening of a brake fluid reservoir, and is perfect for siphoning out the brake fluid. The Nitro Fuel bottle can be easily squeezed for siphoning fluids (e.g. oil) back up into the bottle... Works like a charm!
04-02-17, 08:58 AM
