DS brake pedal problem
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  1. #1
    Fellow Frogger!
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    Apr 2016
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    Bedford, UK
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    Default DS brake pedal problem

    A fellow DS driver over here has a problem. In actual fact it's a LHD 1968 ID19 with a brake pedal rather than a button.

    The car hasn't been driven in a while and the pedal doesn't feel 'right' anymore. The car still brakes well (with the wheels locking up when they are jammed on), but the pedal seems to give a 'click' (not sure if this is a feeling or a sound) when the pedal is fully depressed. The feeling is the the click is mechanical in nature - but not sure. Does this sound familiar to anyone?

    I think this same DS driver recently had a problem with a burst rubber pipe and a very low reservoir. Is it possible that the click is related to air in the system?

    Any advice welcomed and I will pass it on.

    Paul

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  2. #2
    Fellow Frogger! Don B. Cilly's Avatar
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    Default

    It's definitely possible.
    There's also an easy way to find out. Bleed the brakes.
    Or at least, bleed some half-litre of fluid out of the passenger side brake - which is very easy to do. If it gets better, do a full bleed

  3. #3
    Fellow Frogger! citroenthusiast's Avatar
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    Default

    Is it a USA model? Remember USA model cars with the brake button have the USA mandated "safety" cutout. The pedal will "click" and shut off flow to one circuit or the other (depending on which one has the lower pressure) if there is a significant pressure difference, for example if you have air in one circuit. It makes bleeding the brakes a PITA because you have to find the sweet spot just before the click in order to force fluid through the lines..
    Cheers,
    John T.

    54 TAV Legere; 61DS19 LHM BVH (son's); 71DS21 BVH; 73SM 3.0; 73SM EFI (Megasquirt); 73SM 3.0 (other son's)

  4. #4
    Fellow Frogger! Don B. Cilly's Avatar
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    Was that in addition to or instead of the standard priority valve?
    Which, BTW, on button-brakes (DSs and Breaks) was at the button itself, on pedal-brakes (IDs) behind the front mudguard.

    Anyway, here we're talking an ID 19 - with a pedal.
    In both systems the priority valve cuts pressure to the brakes last.

  5. #5
    Fellow Frogger! citroenthusiast's Avatar
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    Yes, this is in addition to the priority valve. The idea was that if you had a severed brake line the brake valve wouldn't exhaust all of the high pressure fluid since, as you mention, the priority valve cuts off the brakes last. If you ever tried to bleed the brakes on a USA model you would notice it immediately. The flow starts, you feel the brake valve pop under your foot and the flow stops.
    Cheers,
    John T.

    54 TAV Legere; 61DS19 LHM BVH (son's); 71DS21 BVH; 73SM 3.0; 73SM EFI (Megasquirt); 73SM 3.0 (other son's)

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