can you just drain the fluid and put a new seal?

If the fluid goes into your brake booster can you just empty the fluid and change the seal?
Experienced mechanics share their insights in answering this question :
If there there has been brake fluid in the brake booster, that has damaged the booster and consequently it will have to be replaced. If the master cylinder is leaking at one seal, all seals in the master cylinder should be replaced or just simply install a re-built, or new, master cylinder. If you want these steps performed by a certified Mechanic, dispatched by YourMechanic right to your location, please request replacement of the master cylinder and the responding certified mechanic will get this resolved for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

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If your brake fluid is brown or black, simply adding new fluid is not enough — you`ll need to drain the old fluid and replace it. This is a good sign that it is time to have the brake fluid system flushed, you should add fluid as needed to bring the system up to the full level.
However, many customers may find themselves wondering, “Is a brake fluid flush really necessary?” The short answer is yes. Your braking system relies on the hydraulic fluid to amplify your foot`s pressure on the pedal. This is what allows you to stop a heavy, fast-moving vehicle with minimal effort.
Can You Add Brake Fluid Without Bleeding? Bleeding is not a mandatory part of this process, so yes, you can do it without it. Just inspecting the amount of liquid doesn`t require bleeding.
Brake flushing flush or fluid exchange completely removes any old fluid from the brake system. Your technician typically uses a pressurized flushing machine that attaches to the brake fluid reservoir and forcefully pumps fluid into the system until any escaping fluid is completely clean.
Never reuse brake fluid that has been drained from the brake system or even fresh fluid that has been allowed to sit in an open container, because brake fluid is quickly contaminated by dust, air, and moisture. If your brake system uses DOT-5 brake fluid, do not add either DOT-3 or DOT-4 fluid.
If you do not change the brake fluid, the moisture absorbed by the fluid builds up throughout the braking system. As the water content increases, the boiling point of the brake fluid becomes lower. It will cause excessive heating and make the fluid boil, rendering your brakes inefficient.
If the brake pedal feels soft, spongy, loose, or even bounces upon applying pressure, this can be an indicator that brake fluid needs to be replaced. Also, if the pedal must be engaged all the way before the vehicle slows or stops, it`s time for a brake fluid change.
Empty The Brake Fluid Reservoir

Next, your mechanic will unscrew the reservoir cap and empty the brake fluid into a drain container. A simple tool like a turkey baster or a vacuum syringe will work to extract the old fluid. They`ll also detach the fluid level sensor.

Every hydraulic brake system should be bled and refilled with fresh fluid to remove moisture. A simple method to accomplish this without bleeding is to suck most of the fluid out of the master cylinder with a pump or kitchen meat basting utensil. Make sure you don`t expose the circuit to air when taking the fluid out.
Changing the brake fluid will improve braking providing there are no underlying issues with your braking system. Aging brake fluid will become contaminated with water and metal particles from the parts that make up the braking system, changing the fluid will prevent corrosion and the components eventually failing.
Answer: Contaminated brake fluid is something you should be concerned about. Brake fluid absorbs moisture, and if water — we`re assuming that`s the contamination — gets into the system, it can find its way into the anti-lock braking module, wheel cylinders and calipers.
The repair procedure for an overfilled master cylinder is easy. Simply take a turkey baster and drain the fluid until it sits at the max line. Underfilled Master Cylinder: If your fluid levels are low, the first step is to check your brake pads.
Bleeding the brakes will flush that air out. While you`re bleeding out the air bubbles, it`s best to flush all of the old fluid out of the system and replace it with new stuff.
Bleeding the brakes will flush that air out. While you`re bleeding out the air bubbles, it`s best to flush all of the old fluid out of the system and replace it with new stuff.
Bleeding the brakes will flush that air out. While you`re bleeding out the air bubbles, it`s best to flush all of the old fluid out of the system and replace it with new stuff.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

I got a new battery new alternator put in but my battery just gets drained I keep having to buy new batterys
ANSWER : This may be a sign of a failing voltage regulator or potentially a bad grounding problem causing a draw on the system. The voltage regulator is a unit that regulates the charging of the battery by the alternator. Often times this will result in the alternator allowing too much power to be delivered to the battery resulting in damaging wires and prematurely sometimes destroying the battery. In other cases it may result in the alternator not supplying enough power to the battery, resulting in undercharging the battery or not charging it at all. In either case, I would recommend having an expert from YourMechanic come to your location to diagnose your vehicle’s charging system.

Battery drains quickly, New battery,Heavy drain, Replaced alternator , drain still there,goes away when bat. main 2 fuse is pulled
ANSWER : Hi there. It’s quite possible that you have one of two things causing the drain to the battery. First, you have a bad ground somewhere in the main relay or fuse box or an exposed wire somewhere that is not allowing the circuit to complete from the alternator to the battery. This can cause a battery draining issue as you’re describing, but it could also be one of multiple other electrical problems. The best way to pinpoint the exact source is to have a professional mobile mechanic come to your location and complete a battery will not hold a charge inspection.

can you just drain the fluid and put a new seal?
ANSWER : If there there has been brake fluid in the brake booster, that has damaged the booster and consequently it will have to be replaced. If the master cylinder is leaking at one seal, all seals in the master cylinder should be replaced or just simply install a re-built, or new, master cylinder. If you want these steps performed by a certified Mechanic, dispatched by YourMechanic right to your location, please request replacement of the master cylinder and the responding certified mechanic will get this resolved for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

We have a new battery, new alternator, new coil pk, new master fuse and the car still won’t hold power.
ANSWER : Hi there. The only thing that I could think possible is causing your problem is that something may not have been correctly installed while your son was completing this maintenance. However, if your engine was difficult to start before this service, it’s possible there are different components that are damaged that simply didn’t resolve the issue. The only way of knowing what is going on with your Trailblazer would be to have one of our mobile mechanics in your area come to your location and complete a car is hard to start inspection.

Rear Axle Seal Replacement – What type seal?
ANSWER : Hi there, thanks for writing in. I recommend buy the Toyota OEM part. Although we could go into high detail as to the precise technical differences amongst the various and competing aftermarket seals you are describing, such will not change the conclusion at all. Generally speaking, aftermarket parts are NOT as good as the factory OEM parts. Large car manufacturers spend hundreds of millions of dollars, indeed billions, developing the technologies used in these vehicles and ALL of the parts are extraordinarily carefully engineered to fit very precisely and perform specific functions. In the aftermarket, they try to duplicate that, but more often than not, it does not work. Toyota OEM quality in particular is not duplicated well, if not at all, in the aftermarket.

My car cranks but will not start. I try to do fix the car myself. I put new battery, new alternator, and new ignition coils.
ANSWER : Hi there. Check the spark plugs and see if they are worn or burned. If the plugs are good and they have a good spark, then the engine compression could be low causing a no start situation. If the spark plugs are not emitting a spark, then the crankshaft position sensor could have failed or disconnected. Check the crankshaft position sensor wiring harness and make sure that its plugged in. Check the sensor and make sure that its not broken or damaged. If you need further assistance with your engine not starting, then seek out a professional, such as one from Your Mechanic, to help you.

Should I flush previous antifreeze fluid before adding new fluid?
ANSWER : The antifreeze in the car now is most likely the original coolant. When changing your coolant you need to make sure that you are using coolant that meets or exceeds the vehicle specifications. Your cars antifreeze is a special long life antifreeze. The scheduled flush and replace coolant on your vehicle is 5 years or 150,000 miles. Unless you have a cooling system problem you do not need a coolant flush and change for a couple years. If you do need to add any coolant make sure you are using the exact same type OATS type antifreeze made by MOPAR. . Mixing of antifreeze may degrade the antifreeze properties

It cranks doesn’t start new batteries, oil pressure switch new pmd, new injection pump. new alternator, new glow plugs.
ANSWER : Hello.

A crank but no start condition can be caused by many things. A few common causes are a faulty crank position sensor, or issues with the fuel system. The crank position sensor is used in the engine’s fuel calculations, and in some cases it’s failure will disable the engine.

It may also be possible that there is issues with the fuel system that are preventing the engine from running. If the fuel pump or injectors have an issue the engine may not run correctly, or at all. It may also be possible, for either case, that the issue may be wiring related.

I would start by trying to determine if the engine is getting fuel and then going from there. If you need assistance with these checks, consider YourMechanic, as one of our mobile technicians can come to you in order to diagnose your starting issue firsthand for an accurate repair.