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Brake Fluid - Dot 3 or Dot 4? Recommendations welcome.

Posted

2001 3500 Dually.

 

Hi all just wondering what people are using for brake fluid and if there is any specific brake fluid that is idea for steep mountain driving.

 

I'm about to use Dot 4 on my cars as they need a fluid change and that appears to have a lower boiling point.

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  • Mopar1973Man
    Mopar1973Man

    Been using DOT 3 for years but requires changing and flushing the system every 30k miles.    DOT 4 has better qualities being the boiling point is much higher and the capable of hold a bit m

  • IBMobile
    IBMobile

    I use DOT4 in all my vehicles.

  • Dieselfuture
    Dieselfuture

    Been using dot4, now I got some dot 3-4 not sure how they can call it both. Haven't put it in yet, probably will do it in spring. 

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  • Owner

Been using DOT 3 for years but requires changing and flushing the system every 30k miles. 

 

DOT 4 has better qualities being the boiling point is much higher and the capable of hold a bit more moisture before going south and losing boiling point temps. Moisture in any form is bad deal and will cause rubber failure and metal failure from oxidation.

 

DOT 5 I do not suggest being its a totally different fluid and it is silicone based and requires different types of seals and rubber possibly. This can't be mix with either DOT 3 or DOT 4. 

 

 

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    Been using dot4, now I got some dot 3-4 not sure how they can call it both. Haven't put it in yet, probably will do it in spring. 

    • Like 1

    I run thf1000 Chevron in everything. But I do put dot 4 or 3 in the brakes 

    • Like 1
    • 7 months later...
    • Author
    On 2/9/2020 at 8:05 AM, Mopar1973Man said:

    Been using DOT 3 for years but requires changing and flushing the system every 30k miles. 

     

    DOT 4 has better qualities being the boiling point is much higher and the capable of hold a bit more moisture before going south and losing boiling point temps. Moisture in any form is bad deal and will cause rubber failure and metal failure from oxidation.

     

    DOT 5 I do not suggest being its a totally different fluid and it is silicone based and requires different types of seals and rubber possibly. This can't be mix with either DOT 3 or DOT 4. 

     

     

    I'm getting ready to flush my entire brake system and upgrade to Dot 4 fluid. 

     

    Would you be able to tell me the capacity of the system so I can purchase the correct amount of fluid?

    • Owner

    About a full quart... At least for my truck it has the large reservoir. Plus bleeding... When I do flushes I will typically blow a full quart and fill on the second quart. 

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    Welcome To Mopar1973Man.Com LLC

    We are privately owned, with access to a professional Diesel Mechanic, who can provide additional support for Dodge Ram Cummins Diesel vehicles. Many detailed information is FREE and available to read. However, in order to interact directly with our Diesel Mechanic, Michael, by phone, via zoom, or as the web-based option, Subscription Plans are offered that will enable these and other features.  Go to the Subscription Page and Select a desired plan. At any time you wish to cancel the Subscription, click Subscription Page, select the 'Cancel' button, and it will be canceled. For your convenience, all subscriptions are on auto-renewal.