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Nice to talk to you all again. I've been refurbishing a classic women's city bike for my girlfriend (vintage French - the bike not the girl ;) it's shaping up groovy. The primary problem I'm encountering is the brake calipers. They refuse to stay centered. I adjust them so the pads are centered and equidistant from the rim and on the first pull of the brake lever everything seems to be ok. Two or three pulls later one pad (specifically the one opposite from where the cable is fastened) remains on the rim, while the other continues to move freely. Part of the problem is that the outer housing of the cable has some play aka doesn't remain static. However I notice upon visual inspection that one calpier (the one that becomes stuck on the rim) simply doesn't move as freely/ an equal distance and the other. I've tried adjusting both the hex nut from behind the brake stay as well as the outer nuts with little success. Short of simply replacing the whole mechanism, is there something I'm missing here to solve this?

Ps tried uploading a photo I took with my phone but it was to large for the text box does anyone have a quick fix for that as well?

Btw the bike is a late 70s Peugeot

Again thanks a lot for any input and happy roads :)

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  • Have you tried lubricating the caliper pivots? Oct 8 '20 at 19:14
  • Crop the photo and save the cropped version. Attempt to upload cropped version. Sometimes makes the file size smaller.
    – Jeff
    Oct 11 '20 at 16:41
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Showing a photo of the brake calipers would help, but from your description I'd check such things:

Make sure that brake cable runs in Bowden housing freely. You can try lubricating it, but if there is any friction, no matter if from worn inner sleeve or frayed cable, whole set should be replaced.

Second thing is to check springs on calipers and their mounts. Sometimes plastic housing breaks and do not keeps spring properly. In such case some replacement is needed. But first check those springs adjustment. There are small screws at the bottom of calipers to increase "opening force" of caliper.

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From your description: Are those Mafac brakes that were common on 70's Peugeot bikes? They are notoriously tricky to tune and keep synchronized with the pull. Disassembly, cleaning and re-lubricating with a thin film of grease may help. Especially the pivots of the arms, the gliding surfaces of the springs and the triangle where the short connection cable slides. The plastic disks (mostly red or white coloured) may have deteriorated, inspect those. They may cause the arms to stick.enter image description here

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  • If OP has these it might be easier to replace the whole caliper with a modern dual pivot. They'd be short-pull no?
    – Criggie
    Oct 8 '20 at 19:13
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    @Criggie: The way they attach to the frame and to the fork is non-standard for some. Some have this horse-shoe type mount that attaches with a single central bolt. They could be replaced with long reach models. Others attach in the way of direct mount to fork and frame. Pull and mounting points were proprietary in those days, as Mafac was the only one to make them. (I had a Peugeot in the late 60s, early 70s that was equipped with those.)
    – Carel
    Oct 8 '20 at 20:21
  • Did some digging. It's a peugeot carbolite 103 from the early 80s. It uses standard side pull brakes mounted on the seat stay cross brace. Check out the link for a picture of a similar bike. Especially look at the rear brake, which is the source of my problem, and how the cable goes from bottom to top opposed to the modern top to bottom set up.
    – Ben
    Oct 9 '20 at 3:02

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