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DOT 3 vs DOT 3/4 Brake Fluid

Discussion in 'Stock 2002 - 2005 Explorers' started by sfbayjay, July 27, 2011.

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  1. sfbayjay

    sfbayjay Active Member

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    City, State:
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    I just installed new rear brake calipers in my '02 XLT and bled the system.

    I had one bottle of DOT3 brake fluid I bought for the job, which is what Ford specs for my Explorer.

    When I was finished, the brake fluid reservoir was kind of low and I'd used up my bottle of DOT3 fluid. A friend of mine was coming over and stopped at AutoZone to grab some more fluid so I could top off the reservoir.

    The fluid from AutoZone is Valvoline "DOT3/4" fluid, which says it's compatible with either DOT3 or DOT4 systems.

    Sooo -- can I use this stuff to top off the under-hood reservoir on my system that is full of DOT 3 fluid? Can they be mixed?
     
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  3. techieman33

    techieman33 Explorer Addict

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    Yes you can use it. It is fully compatible with dot 3 fluid. From what I've heard almost no one makes dot 3 fluid anymore they just put dot 4 in the bottle and mark it as dot 3 for those people that are afraid dot 4 will harm their braking system.
     
  4. M1911A1

    M1911A1 Member

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    That's right. Also make sure you dispose of the leftover fluid in the bottle. Many people make the mistake of keeping openned containers for future re-fills. That's a no-no since dot3 or 4, will absorb moisture from the air. Many brake systems seals are damage by people re-filling contaminated fluid.
     

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