• What a classic racer! Nice one. Take the caliper apart, clean all parts and assemble again making sure all contact parts esp center of arms, washers in between, and bolt are properly lubed. The grit builds up in the caliper bolt and prevents center of arms from moving freely. Alternatively get a modern caliper: definetely much better braking performance than those weinmanns...
    Before replacing anything, do your research at Sheldon Brown page on classic french bikes as some parts (headset, stem, chainrings, etc) are no longer ISO (aka modern standard).
    I had a similar motobecane converted and had to get rid of lovely cranks (PCD obsolete). If fitting a new quill stem, beware than french forks steerer inner diammeter is a tad smaller than ISO one: the stem will come in applying some brute force, but will not come out: sand the bit that goes into the steerer before installling it.
    Hope this helps.

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