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    loss of brake fluid

    The brake fluid top up reservoir is completly empty. There are no leaks anywhere on the car, so where is the brake fluid going?
    Any ideas please.
    Keefers

    #2
    Either your front pads have worn excessively since you last looked at the fluid, or, more likely, its leaking from the master cylinder into the servo.....

    Comment


      #3
      stagling

      the previous reply is almost certainly the answer to your broblem suggest an exchange, or new master cylinder to cure fault/

      Comment


        #4
        Originally posted by stagling View Post
        the previous reply is almost certainly the answer to your broblem suggest an exchange, or new master cylinder to cure fault/
        I hope he has it sorted by now as the post was 2012

        Comment


          #5
          I've just had the same situation as keefers; the car has been standing for about a month. Topped up the low half of the master cylinder and went on a 50 mile run this morning and no further loss of brake fluid and no clouds of white smoke.

          How do I check for fluid in the servo?

          Thanks,

          Steve.
          SteveD
          White 1972 2nd Sanction TV8 BW35 Wire Wheels

          Comment


            #6
            Steve,

            Easiest/cheapest way is possible to dip the servo by pulling vacuum hose out and push a long cable tie or wire wrapped tissue/ cotton down to the bottom, or possibly a thin tube whilst sucking and seeing if a fluid comes up the tube - but don't swallow!!!!

            Best way might be to buy an endoscope camera - ebay these are ridiculously cheap £5'ish and can be bought to plug into a laptop or directly into an android phone. A great tool for those hellish jobs around the house and car. They usually come with a hook and magnet to help retrieve objects and sometimes a mirror for example for a preliminary look in cylinders at the valve seats.

            Alan

            Such as:- (no connection)

            USB Endoscope Borescope Inspection Tube HD Camera For Android Mobile Phone 5.5mm | eBay
            Last edited by barkerwilliams; 10 December 2020, 17:07.

            Comment


              #7
              Thanks Alan, I'll have a look. I wasn't sure about pulling the vacuum hose out.

              Steve.
              SteveD
              White 1972 2nd Sanction TV8 BW35 Wire Wheels

              Comment


                #8
                I pulled the vacuum hose off but my endoscope camera is too big and a cable tie or wire only go in about an inch.

                Does the white plastic bit come out?
                You do not have permission to view this gallery.
                This gallery has 1 photos.
                SteveD
                White 1972 2nd Sanction TV8 BW35 Wire Wheels

                Comment


                  #9
                  I think Alan, meant the hose with the non return valve on it
                  "The UK,s 2nd Most Easterly Stag" Quad Exhaust- ZF 4 Speed BOX

                  Comment


                    #10
                    Please excuse my ignorance but is the white plastic bit the nonreturn valve?
                    If so how is the valve fixed to the servo and how do I remove it; I don't want to wreck anything.
                    Steve.
                    SteveD
                    White 1972 2nd Sanction TV8 BW35 Wire Wheels

                    Comment


                      #11
                      I just undo the 2 1/2af nuts and slip the master cylinder forwards. gives access into the servo but also allows you to see if brake fluid is leaking past the pushrod seal.

                      Why make it complex
                      Stags and Range Rover Classics - I must be a loony

                      Comment


                        #12
                        Originally posted by richardthestag View Post
                        I just undo the 2 1/2af nuts and slip the master cylinder forwards. gives access into the servo but also allows you to see if brake fluid is leaking past the pushrod seal.

                        Why make it complex
                        How do you undo the lower of the 2 1/2AF nuts with the MC and Servo in situ?
                        SteveD
                        White 1972 2nd Sanction TV8 BW35 Wire Wheels

                        Comment


                          #13
                          That's what I was wondering because I tried it today to check clearances between servo and cylinder. No room for socket or wrench with front inner wing clash.
                          John
                          1978 Stag Brooklands Green

                          Comment


                            #14
                            I managed it with 1/4” drive socket and universal joint.

                            Nigel

                            Comment


                              #15
                              pretty sure I used a ratchet spanner, if not then a 1/4" drive socket. It was not difficult.

                              By unclipping the brake lines from the bulkhead I was able to shift the master far enough forwards to check for fluid around the push rod. In this case it was bone dry. I later found that the brake fluid was leaking from the flexi/rigid brake union on the o/s/f. the only sign was soft underseal in the area behind the union. no drips, no enormous mess. Must have just been spraying out under braking but not drawing air back in.

                              I have found that rear wheel cylinders can be a significant cause for brake fluid loss, when the seals fail. normally can see that though dropping off the bottom of the backplate
                              Stags and Range Rover Classics - I must be a loony

                              Comment

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