Yes. Brake fluid sucks up moisture like a sponge.
replace all of it, otherwise it will contaminate the new fluid
how to replace brake fluid on a 1999 Toyota 4runner
if your brake fluid is low, you probably need to replace your brake pads. If your pads are good and you fluid is low, you have a leak somewhere. By replacing your pads, the brake fluid level will rise to the proper level. If you add fluid now, then replace your pads, brake fluid will leak out the top of your fluid reservoir and most likely eat the paint off what ever it spills on. Brake fluid and car paint DO NOT MIX.
no
Siphon it out. Do not drive or pump the brakes. Replace the brake fluid. This will cause the brakes to fail.
There is no specified time to replace the brake fluid of any vehicle, as long as you keep it topped up. Brake fluid does not 'wear out'. I have replaced the entire brake fluid on only a few occasions, and always only because I have been replacing seals or brake cylinders and it made sense to replace fluid then, before bleeding the system.
Calibers are sticking. You will need to replace the calibers that are sticking and flush all the old brake fluid out of the system then replace it with fresh fluid.
Brake fluid does not need to be changed as oil is but constantly needs to be replenished.
You have your car towed to a repair station where they will bleed the brake fluid and grease out of the brake system, and replace them with good, clean brake fluid.
Depending on the vehicle, under the hood there is a container that is labeled Brake Fluid. That is where a person measures the amount of brake fluid left, and with a funnel adds the appropriate amount.
Probably need to replace the brake cyclinders if the master cylinder is ok.
Sticking brake calipers. This can be caused by moisture in the brake fluid which will cause the calipers to rust. Replace the calibers and replace all the brake fluid. It can also be caused by driving with your foot on the brake.