Makes brake fluid is black

The brake fluid is black and the cover looks all sucked up and we just put the whole axle new brakes and new drums

My car has 22200 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
Brake fluid accumulates moisture and contaminants over time and consequently the fluid should be replaced about every 35,000 to 50,000 miles. To service the fluid you can request a brake system flush and refill. If you request that service, the responding certified mechanic from YourMechanic will get this taken care of for you right at your location. 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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Normal aging: without routine maintenance, brake fluid naturally darken as it slowly becomes contaminated. Moisture contamination: the heat in the brake line can make moisture boil, which darkens the fluid and introduces air into the hose.
What causes dirty brake fluid? As we mentioned earlier, it can be anything from residual moisture to unwanted particles. Even if water for some reason enters the brake fluid, it will lead to breaking down the molecular structure of the fluid and that on its own can bring in major issues.
New brake fluid should be clear with a yellow tint to it.
Like we said above, fresh brake fluid should be almost clear with a hint of yellow coloring. If your brake fluid resembles oil, and is a dark brown or black color, then you need a brake fluid flush and replacement.
If your brake fluid color is dark, it needs to be flushed and replaced with fresh fluid that`s compatible with your vehicle. Brake fluid color usually goes darker as it gets old. This mainly occurs because brake fluids are hygroscopic, which means they are designed to absorb water.
So this is the reason why many experts don`t recommend driving your vehicle with black fluid. Although black brake fluid does not always cause an alarm, using black fluid can cause serious issues. This fluid content can corrode the steel components of your brake system and ruin them.
In fact, it almost looks clear when you pour it out of the bottle. Fresh DOT 5 brake fluid is a purple color. This allows you to easily distinguish between glycol- based and silicone-based brake fluid. Brown or black brake fluid is a key indicator that your brake fluid needs replacing.
Use only GM approved DOT 3 or DOT 4 brake fluid, as indicated on the reservoir cap, from a clean, sealed container.
Open the brake fluid reservoir on your vehicle. (It`s usually under the hood, attached to the top of the master cylinder.) Your brake fluid should be clear or may have a slightly orange, blue, or green tint. If the fluid looks dark or murky, you should bring the vehicle in for service.
Here is the short answer: Yes, brake fluid can go bad. Brake fluid absorbs moisture, which reduces its performance. For that reason, it`s best practice to change brake fluid every two years. However, brake fluid is one of the maintenance items that drivers miss most often.
High brake temperatures accelerate the rate at which the corrosion inhibitors in brake fluid break down. As the fluid ages, oxidation eats away at metal surfaces, creating dissolved acids and sludge that are carried with the fluid as it surges back and forth with every application of the brakes.
DOT 4 Brake fluid: Typically in light yellow or crimson red shades. DOT 5 Brake fluid: Typically in purple shades. DOT 5.1 Brake fluid: Typically in clear, yellow, and blue shades.
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.
For most riders, that`s every 1-2 years. If you use DOT 5 you can go longer between changes. You can tell it`s time with a tester or by checking the color of what`s currently in your system. New brake fluid is clear with a yellowish tint.
Most manufacturers recommend that any open bottle of DOT brake fluid should be used within 12 months, or else discarded. Keep in mind that a full year is the very outside limit of what would be acceptable.
Use a screwdriver to press and hold the plunger in the rear of the master cylinder. The plunger should be very firm, if not immovable, past a few millimeters. If the plunger keeps moving in, this indicates a fault of at least one of the internal seals.
Prestone – DOT 3 Brake Fluid: Synthetic, Prevents Corrosion, Safe For ABS, Disc, Drum Brakes, 50k miles, 32 oz (Part No. AS401)
DOT 4 brake fluid has higher wet/dry boiling points than DOT 3, making it a better choice for higher temperature braking applications, like in high-performance vehicles.
What Does Brake Fluid Look Like? Brake fluid, unlike engine oil or antifreeze, is colorless. It is much lighter than those fluids, too, with a consistency like vegetable oil.
VELOX Mineral 1L Brake Fluid Pink is easy to use and compatible with all hydraulic braking systems.
On average, you will need a brake fluid flush every 2 years or 30,000 miles. Routine maintenance also heavily depends on your driving patterns. For example, if you tend to drive shorter routes with frequent braking, you may need more frequent brake fluid flushes.
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. Then refill with fresh fluid.
Do not overfill. If your vehicle has a dual-chamber reservoir, fill both chambers to “full” line. If reservoir is extremely low or empty, it may not be safe to drive your vehicle. Consult an ASE-certified brake technician immediately.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Low brake pedal and anti-lock brakes are not kicking in.
ANSWER : The brake pedal is working to stop the vehicle, but there may be air in the controller unit causing the ABS brakes to not function. I recommend bleeding the brake system from the farthest location from the master cylinder to the master cylinder including the ABS unit. If the brakes are still spongy after a full bleed, then the controller will need to be replaced. If you need further assistance with your brake pedal being spongy, then seek out a professional, such as one from Your Mechanic, to help you.

Read Full Q/A … : Makes brake fluid is black

Brake pedal has very little resistance
ANSWER : From what you’ve described, I’d advise you to not drive the vehicle and get the brakes bled out. It’s possible that you still have a brake fluid leak in this case.

I’d suggest having this looked at by a certified technician, like one from YourMechanic, who can diagnose your brake system firsthand and bleed your brake system if necessary. Best of luck.

Read Full Q/A … : Makes brake fluid is black

EPC light on 2004 Jetta. Code said brake switch faulty, but brakes lights worked. Replaced brake switch, now no brake lights.
ANSWER : Hi there. The first thing that pops in my mind beyond of what you have listed is perhaps the electrical harness attached to the brake switch. Perhaps the harness itself is damaged or you have an exposed wire, loose ground wire somewhere. You might want to have a professional mobile mechanic come to your location and complete a brake lights not working inspection to help you diagnose this issue.

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When I put my foot on the brake my back left brake light goes off, when I take it off the brake the brake light comes on
ANSWER : I would suggest trying to disconnect and reconnect the wiring to the rear lights. I have seen these older Toyota vehicles rear lighting short out on the lights themselves due to the way the light circuit was made on the lamp housing. Look at the housing circuit on the light to see if one is touching another, and that could tell you why it is malfunctioning. There could also be a problem with the brake light switch. If you are not comfortable dealing with wires, I recommend getting in touch with a certified mechanic who can look at your brake light issue for you to see what’s going on.

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No brake fluid is getting to the rear brakes
ANSWER : As far as the brake issue, yes, there needs to be a check to see if there is brake fluid entering into the proportional valve. If there is fluid supply to the valve but not out then the valve will need to be replaced. Any electrical faults in the rear ABS system are generally indicated with a light illuminated and if so, then the flash codes can be read out. But with no light illuminated then there most likely no electrical failures in the system. If the source from where the brake fluid supply cannot be located, then you may want to enlist the help of a mechanic, such as one from YourMechanic, to help with the diagnosis of your brake system.

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Supportive bar attached to brake pedal interrupts proper braking process
ANSWER : It’s possible to have someone alter the brake pedal or adapt a brake pedal from a different vehicle. You may call around to some customization shops to see if anyone is interested in taking on the project. But first, I would try reaching out to the selling dealer with your concern – especially since it is a new model. Good luck.

Read Full Q/A … : Makes brake fluid is black

abs light on brake line broke have been replace I bleed brake line but brake pad still go to the floor now wheels lock up
ANSWER : Hello. If the brake pedal is going to the floor then that means that it is not building pressure. If the brake system has been fully bled and there is no air in it then most of the time it is a bad master cylinder or it can be caused by a bad ABS module. If the brake fluid was low and if air got into the system then the only way to properly bleed it is with a scan tool that would allow you to open and close the valves in the ABS unit. Air gets trapped in these easily if the brake fluid gets low. This can also explain why the brakes are locking up. I would usually use my scan tool to bleed the system out first before going any further. I would also scan the brake control module to see what it is reading as a fault. If there is no air in the system and if there is no prominent code then I would replace the master cylinder first. If you want to check out why your brakes are locking up, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose and repair this.

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Brake sensor is to sensitive causing brakes to flicker while driving. 2005 Mercury Montego
ANSWER : Hi there – your brake light switch needs a minor adjustment. It is adjusted too "tight" or close to the brake pedal lever, or possibly has failed. Adjusting/replacing it will eliminate this flickering problem. I recommend a brake light isn’t working inspection performed by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, and give you an accurate assessment of damage and cost estimate for repairs.

Read Full Q/A … : Makes brake fluid is black