1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

Brake Fluid - is Dot 5.1 too good for my old diesel?

Discussion in 'Motors' started by lmfy2k, 7 Jul 2006.

  1. lmfy2k


    Joined: 12 Feb 2004

    Posts: 6,918

    Location: Manchester

    hi guys, got an Astra 1,7D, low blow turbo on a Nreg 1996, im about to change the brake pads on it and thought id change the brake fluid awell as i have never done it and im not sure when it has been done last.

    went to my local motor factors and they had dot 4 and dot 5.1, naturaly i purchased the 5.1 as its better. Ive not used it yet, but it being an old car, would it still be wise to use dot 4 or use dot 5.1?

    Last edited: 7 Jul 2006
  2. Dogbreath


    Joined: 18 Oct 2002

    Posts: 16,655

    Location: Devon

    DOT5.1 is compatible with older fluids such as DOT4 so there should be no problems. The (increasingly rare) DOT5 silicon brake fluid is the one that is incompatible with mineral fluids and requires the system to be flushed out.
  3. Foghorn Leghorn

    Wise Guy

    Joined: 5 Jul 2003

    Posts: 2,417

    Location: Cheshire

    You're a star :D

    Was going to inquire about this in a few weeks when I change the caliper on my 406. Currently uses Dot 4