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After having problems with seizing wheel cylinders and other brake problems due to moisture in the hydroscopic brake fluid, I started flush clean fluid through the brake systems of my vehicles every 2 years... Have not had a single corrosion (or any brake problem for that matter) since...
PS should be 18000 miles and brake fluid about 30000 miles PS should be 18000 miles and brake fluid about 30000 miles
It depends on the type of fluid and level of contamination or heat. if there is no problem with the fluid it should be left alone!
You need to flush the power steering fluid on a 2003 Toyota Highlander every two to three years. You should check the fluid levels weekly.
You should check your brake fluid every three months to make sure the levels are okay. If the levels are down, replace the fluids immediately...better safe than sorry.
Generally every 30000 miles unless you have synthetic fluid, and the transfer case as well.
once a year
If the fluid is more than a couple years old and is dark and nasty looking, suck it out of the master cylinder, pour fresh dry fluid of the correct type in, and bleed all four wheel cylinders/calipers starting with the right rear till the fresh clear fluid comes out. I usually change mine every time I do a 4 wheel brake job, usually every 50-60 k miles. On my motorcycle I flush it out every two years. I have no brake hydraulic problemswith any of my vehicles.
Be more specific, Are you talking about the transfer case, transmission, or front differential?
Usually it's low brake fluid or a problem with the abs. Check the brake fluid reservoir. Often the brake fluid will go down as the brake pads wear and the calipers has to travel further.
Every 2 years
Usually I change every 5000km 2 litre & flush every 20,000km 8-10 litre