'84 Dia compe 400 question, help plz?
08-09-19, 09:08 AM
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'84 Dia compe 400 question, help plz?
This may be a really silly question, but...here goes: cleaning up a toasty '85 League Fuji ($10 yard sale bike) needs some TLC to be a daily beater. Anyway, broke the rear brake down for clean and lube, but upon re-install, the one arm does not pivot unless the mounting bolt is loose. The problem appears to be the spring holder portion that the mounting bolts extend from, and its interface with the arm that the spring holder is in immediate contact with. I assumed the spring holder and that arm were integral (attached) to each other. But that defies logic, cuz it appears that arm should pivot independent of the spring holder (sorry for lack of nomenclature). Perhaps rust/oxidized welded? Not familiar with these brakes, so figured i would ask the pro's before i break something trying to separate them.
08-09-19, 01:04 PM
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1. Brake arm. 2. Black spring holder. 'Sposed to be welded together, or no? Has a weird (to me bolt "nut") too. Doesn't shimano use an unshakeable nut, or dbl. Nut?
08-09-19, 01:36 PM
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Yep, rusted together - both arms are supposed to move independent of the central shaft (which the spring holder is a part of). I've had that happen and it usually doesn't take much to get everything apart once you set your mind to it. Plenty of spare parts out there if it's too bad to be saved or if you mangle something.
08-09-19, 02:59 PM
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No worries. Just fully dismantle and overhaul. These are easy to adjust, because there are two nuts you can lock together. You might need a cone wrench or an $11 Park Tool obw-4. (Check ebay.)
08-09-19, 04:16 PM
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Thanks, folks
That is what i suspected. I have adjusted/installed a handful of brake sets over the years, mostly shimano, some dia diacompe, perhaps; but think i was having short And long term memory loss on this one. LOL. Broke every thing down but that separation. I am sure it wont be much trouble. The stuck cable housing stop adjuster was interesting. Ended up chasing the threads. Thank You.
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08-09-19, 05:06 PM
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Grease that washer between the brake arms. Between everything except the pads and rims...
08-09-19, 08:25 PM
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Well that was harder than one would think it should be! Ended up using heat just like removing a pedal shaft from an aluminum crank arm (Sheldon trick). Careful not to damage the spring's heat treat. All worked out in the end. +1 on the grease! Thanks again!
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