DS21 rear brake lockup - again
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Thread: DS21 rear brake lockup - again

  1. #1
    Fellow Frogger!
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    Icon5 DS21 rear brake lockup - again

    Today I went to test my car to see if a couple of new tyres had fixed the extreme shuddering problem at last.
    I barely got through my gates when the LHR brake locked up This has happened twice before. The first time chamfering of the linings fixed it. The second time I checked and adjusted the shoe alignment and found that the RHR brake was covered inside and out with a film of thin grease. I also replaced the cylinder o-rings although there were no leaks visible. I could only think that the oil/grease was from a faulty bearing seal.
    This time the LH and RH interiors are quite clean.
    My question is what can I do next and how critical is the shoe alignment?

    Don

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    Citroen DS21 Pallas 1970 Renault 16TS 1976 Renault 5TS 1981

  2. #2
    Fellow Frogger! citroenthusiast's Avatar
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    If the shoes themselves are contaminated, it could cause them to grab. Consider replacing the shoes. Shoe alignment is not that critical, all that happens is the shoes will wear unevenly if you don't adjust the eccentric on a regular basis.
    Cheers,
    John T.

    61DS19 LHM BVH (son's); 67DS21 BVH; 71DS21 BVH; 73SM 3.0; 73SM EFI (Megasquirt); 73SM 3.0 (other son's)

  3. #3
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    Quote Originally Posted by citroenthusiast View Post
    If the shoes themselves are contaminated, it could cause them to grab. Consider replacing the shoes. Shoe alignment is not that critical, all that happens is the shoes will wear unevenly if you don't adjust the eccentric on a regular basis.
    Thanks John. The shoes show no sign of contamination and I have no idea how to fix this problem. In 60+ years of playing around with old cars I have had just about everything go wrong but never had this trouble with any other cars.
    Don
    Citroen DS21 Pallas 1970 Renault 16TS 1976 Renault 5TS 1981

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    Have you considered the condition of the flexible hoses? Bad hoses with some internal failure could cause random behaviour.
    JohnW and Hotrodelectric like this.

  5. #5
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    Quote Originally Posted by David S View Post
    Have you considered the condition of the flexible hoses? Bad hoses with some internal failure could cause random behaviour.
    Thanks David. No I haven't thought of that and my local DS guru did not mention it either. I had been going to ask on this site whether I should consider replacing the hoses because I suspect they are 47 years old. I didn't because it was a no-brainer; of cause I should do it.

    Don
    Citroen DS21 Pallas 1970 Renault 16TS 1976 Renault 5TS 1981

  6. #6
    Now go make me a sandwich Hotrodelectric's Avatar
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    Quote Originally Posted by David S View Post
    Have you considered the condition of the flexible hoses? Bad hoses with some internal failure could cause random behaviour.
    Great suggestion. I've heard of it happening on "regular" old cars, didn't think it would happen on an LHM D.
    The measure of your character isn't what you do when people are watching- it's what you do when they aren't watching.

  7. #7
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    SUCCESS! I should have checked it before but I simply adjusted the shoes as close as possible to the drums and that has cured the problem. Another lesson learned.
    Don
    Citroen DS21 Pallas 1970 Renault 16TS 1976 Renault 5TS 1981

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