Can You Mix Dot 3 And Dot 4

The brakes are like our best friends when it comes to driving. They keep us safe when traveling. And what’s this? The finest wingman for your brakes is brake fluid, who makes sure they work at their peak! It resembles a relay race in that the brake pedal delivers the baton to the brake fluid, which slows or stops your car.Therefore, today’s topic will be DOT3 and DOT4, two braking fluids you may be familiar with. Oh, and we’ll also check to see if these two can you mix dot 3 and dot 4. Cool, right? Let’s get going!

Can You Mix Dot 3 And Dot 4

Can you mix dot 3 and dot 4
Can you mix dot 3 and dot 4

Can you mix dot 3 and dot 4? DOT3 and DOT4 braking fluids have different chemical compositions, therefore mixing them may not be a good idea even though it is technically possible. Your brake fluid’s overall quality can suffer as a result. The blending procedure is compounded further by the differing brake fluid formulae used by various manufacturers.

The good news is that the majority of automakers recommend one type or the other for particular automobiles. To keep your brakes functioning at their best and ensure safety, replace your brake fluid according to the type specified in your vehicle’s manual.

It’s important to stress that having sufficient brake fluid quality is necessary for your automobile to function since it uses hydraulic systems to convey force in order to slow down the car when it brakes. Any issues or leaks in your car’s brake system could have serious repercussions that endanger passenger safety, such failed brakes. You can keep your vehicle in great shape by routinely checking and refilling your braking fluid.

The Pros And Cons Of Mixing Dot 3 And Dot 4

Can you mix dot 3 and dot 4
Can you mix dot 3 and dot 4

When filling off often renewed brake fluids in an old car, can you mix dot 3 and dot 4 of brake fluid can save money and be more convenient. While can you mix dot 3 and dot 4 a great method to update your braking fluid without breaking the bank, DOT4 is normally more expensive than DOT3.

However, there are certain disadvantages to combining various brake fluids because they each have distinct qualities designed for particular cars, which could lower overall performance because they behave differently under pressure. For instance, DOT3 brake fluid flows more easily through brake lines because it is less viscous than DOT4 brake fluid. It might not flow as smoothly as anticipated when disposed of using DOT4, which might compromise the efficiency of your brakes.


  • easier vehicle upkeep.
  • Spend less money.
  • Maintain your composure in less-than-perfect situations.


  • Reduce Lifetime of braking components.
  • decreasing its efficiency under sudden and drastic temperature changes.
  • Affects warranty coverage if parts develop defects as a result of the use of fluids other than the manufacturer’s in any modification process.

How To Mix Dot3 And Dot4

Dot 3 and Dot 4 brake fluid mixing is a procedure that requires the highest caution and attention to detail. It’s crucial to adhere to a few rules when mixing the two types to guarantee the best braking performance for your car.

Step 1: Park Your Vehicle on a Level Surface

Before can you mix dot 3 and dot 4 any braking fluids, you should first relocate your car to a flat surface. This will guarantee the procedure’s accuracy and effectiveness because it eliminates the possibility of an uneven mix.

Step 2: Allow the components of your car to cool

It’s important to wait until your car’s components, especially its engine, have completely cooled down before mixing the braking fluids. This will aid in avoiding any difficulties or mishaps that might arise.

Step 3: Find the Brake Fluid Reservoir in Your Car

Open the hood when your car has cooled off and look for the brake fluid reservoir. Spend some time finding it in advance to prevent confusion.

Step 4: Remove Your Reservoir’s Cap

Once you’ve located the brake fluid reservoir, take off the lid to inspect the interior for any potential debris or filth. Your fresh batch of brake fluid shouldn’t contain any dirt.

Step 5: Remove any mud or grime from the reservoir.

Before adding any additional brake fluid to this region, use a clean rag to wipe away any dirt or grime you see when you open the reservoir for your braking fluid. Such debris might complicate and block the operation of your brakes if it is not removed completely.

Step 6: Equal amounts of both types of brake fluid should be added.

Can you mix dot 3 and dot 4
Can you mix dot 3 and dot 4

Both DOT3 and DOT4 brake fluids should be injected at the same time, at the suggested ratio of 50% DOT3 and 50% DOT4. If you’re unsure, check your car’s manual to be sure you’re using the right combination.

Step 7: Over-adding on brake fluid

can you mix dot 3 and dot 4, Make sure you add a little bit extra brake fluid than is required when you fill the reservoir with a new batch. After executing a purge, any open spaces will be filled up in this manner, protecting the brake system from harm.

Step 8: Reinstall the cap on the reservoir holding the brake fluid.

Replace the brake fluid reservoir cap tightly after adding the fresh brake fluid to your car. It would be beneficial if you carried out this action prior to restarting your car.

Step 9: Verify that the level of your brake fluid is at the required level.

Check to see if your new brake fluid level is appropriate after starting your car. If not, reopen the reservoir and add a bit at a time until the desired level is reached.


Can you mix dot 3 and dot 4? You now know the truth about DOT3 and DOT4 brake fluid mixing! Although it is theoretically possible, it is not something to dismiss. Because of their special compositions and boiling points, these fluids could cause major problems for your vehicle and even put your safety at danger. Because of this, experts advise sticking with a single type of brake fluid when it’s time to refill it.

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