Brake fluid mixing
12-13-2008, 10:04 PM
#1
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Brake fluid mixing
Is it okay to mix brake fluids if they are different? my brake fluid is very low and causing my brake light to come on.
I currently have Super Blue racing ATE as my brake fluid which is a dot 4 fluid. I have some Valvoline brake fluid that says it exceeds dot 3 and dot 4. would that be ok?
I currently have Super Blue racing ATE as my brake fluid which is a dot 4 fluid. I have some Valvoline brake fluid that says it exceeds dot 3 and dot 4. would that be ok?
12-02-2009, 06:55 AM
#4
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12-02-2009, 10:03 AM
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Re: Brake fluid mixing
Most brake fluids fall into one of four categories: DOT 3, DOT 4, DOT 5, and DOT 5.1, and this should be on the label.
The higher the DOT category, the higher the minimum temperature at which the fluid can boil is, so the greater your protection against ineffective brakes due to boiling your fluid.
Fluids that are DOT 3, DOT 4, and DOT 5.1 are all glycol based, known as non-SBBF, or non-silicone based brake fluid. Any of these grades can be mixed with each other. So yes, you can mix your DOT 3 fluid with your DOT 4 fluid.
DOT 5 is SBBF, or silicone-based brake fluid. DOT 5 cannot be mixed with DOT 3, DOT 4, or DOT 5.1.
The higher the DOT category, the higher the minimum temperature at which the fluid can boil is, so the greater your protection against ineffective brakes due to boiling your fluid.
Fluids that are DOT 3, DOT 4, and DOT 5.1 are all glycol based, known as non-SBBF, or non-silicone based brake fluid. Any of these grades can be mixed with each other. So yes, you can mix your DOT 3 fluid with your DOT 4 fluid.
DOT 5 is SBBF, or silicone-based brake fluid. DOT 5 cannot be mixed with DOT 3, DOT 4, or DOT 5.1.
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