We’ve all had those times where we are working on our cars and wanna check out things that you may need replace or refill. Personally I try to stay on top  of fluids ,but I’m not to sure about brake fluid so we are going to go through and find out if you should mix brake fluid or not.

First of all you need to know what kind of brake fluid you have in your car here’s what you could possibly haveDOT3, DOT4, DOT5 and DOT5.1

(glycol-based)DOT3: This brake fluid will absorb less water than DOT4 than from the air over longer periods of time. Which means you won’t have to change the fluid as frequently.

(glycol-based)DOT4: Has a higher boiling point than DOT3  so if you have a car that is low on brake fluid and you know it has DOT3 you can put DOT4 into the brake fluid area. If your car has DOT4 do not put in DOT3 since DOT4 has a higher boiling point you have a chance that the DOT3 may heat up and burst the line which nobody wants to spend the money to fix that.

(silicon-based)DOT5: This brake fluid is meant to be used in cars where moisture is unavoidable. This means more like higher performance vehicles and military vehicles. Most vehicles are not meant to run this that have ABS(Anti-lock brakes) Silicone is chemically inert won’t damage paint like the conventional brake fluid. Has a high boiling point like DOT4.

(glycol-based)DOT5.1: has a higher boiling point than DOT3 and DOT4 it can be used as a higher performance since it does outdo DOT4. DOT5.1 is mainly used in vehicles that have an ABS system.

Overall you can mix DOT 3,4,5.1 together just remember that you have to be careful on how you mix it. DOT3 has the lowest boiling point so do not put it into DOT4 and DOT5.1 because you do not want to blow a brake line.

DOT5 is not to be mixed with anything but itself since it is silicon-based brake fluid.

How to bleed brakes

Now you may be wondering what brake fluid you have in your car which I know I cannot tell you off the top of my head. So what you could do is possibly check the owner’s manual and see what is recommended to be put into your vehicle in case you don’t wanna put in the wrong brake fluid.

Overall you can’t tell the difference just by looking so I say instead of mixing and adding more fluid you should just bleed your brake lines. Some of you may not know what this means. Bleeding the brake lines is essentially taking out the bad fluid and replacing it with new fluid.

So how do bleed your brakes? first, put your vehicle in park and make sure the emergency brake is on. Then take out all the old brake fluid with a suction tool of some sort. Then add in your new brake fluid make sure to fill it up pretty good.

Then to get started go to the bleeder valve and remove the cap. Then attach the bleeder tool hose make sure the hose goes down into some fluid and is beneath where it is connected so you do not add air to the system.

Then get your wrench and slowly open the valve until fluid starts to come out of it. Then get into your vehicle and push the brake pedal slowly and all the way down. Make sure to have someone help you the brake pedal cannot come up until you close the valve line.

Once you’ve closed the brake valve line pump your brakes to get the fluid moving through those brake lines. Do not pump brake with valve open will just keep moving fluid through the line that you just bought best not waste it.

The brake pedal is pumped to create pressure but can only do so before the bleeder valve is open. Pump your brakes until there’s no air left in your system and the fluid is looking brand new.

Once there’s no longer any air in your hose and the fluid looks clean and new it’s time to close the bleeder valve. Make sure to carefully remove the hose so that brake fluid does not seep out. Put the cap back on the bleeder valve and boom just like that you’ve bled your brakes.

If you do this for all your brakes which you probably are make sure to fill the reservoir before doing each brake line so you don’t accidentally pump air through them. Make sure to add brake fluid as needed when you are done top off the brake fluid to the fill line then put the cap on tight.

Before you do anything else pump the brakes a few times before releasing the emergency brake so that the fluid is for sure in the lines. Once you’ve done that pull the emergency brake and put the vehicle in drive slowly and push the brake pedal multiple times until you feel your vehicle stopping.

If your brakes feel spongy or hard you may want to check if you have a leak in the lines if it is hard and if it is spongy you may just have to get the air out of them.


Can you mix brake fluid? Yes, you absolutely can mix your brake fluid just make sure to be careful which ones you buy and decide to mix overall you’re better off just buying DOT4 to play it safe, but hey you could also just bleed them and get nice clean fluid this concludes the statement “Can you mix brake fluid?”

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