Anyone know anything about disc brakes?

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  • I've had success with a flathead bit and a set of molegrips holding it in place against the back of the pin then using a small adjustable to turn it all. When that's failed I've pulled the caliper in half, removed it using the body of the pin in a vice and then reassembling the caliper and refilling the system.

  • Spoke too soon pushed the pistons back on my hope rx and then got a small pop his and splatter of mineral oil from the lever . Now lost all pressure in the 8020 lever ! Is this a common lever fault . Left hand one btw.

  • @PhilDAS wins. In the bin, new one on its way. Not sure what that bolt is made from. Not sure it’s metal. 🧀

    Full saga:

    Rear brake is noisy.
    Take off wheel at home. Clean rotor. Decide to sand back pads a bit, as it’s been standing unused for a few months. Go to undo the retaining bolt - screwdriver churns up the thread on first go.
    Find a sharper screwdriver. Get the bolt inbound, but it seized up again.
    Spray WD40 and leave it to soak.
    Return. Try again. Screwdriver churns the thread up completely.
    Try the exposed other side with needle nose pliers. Snaps clean off.
    Things are starting to get annoying here.
    Get the drill out and find the stripped bolt bit. Whole head of bolt scrapes clean off.
    At this point I know it’s over.
    Drill into the bolt to remove it, still stuck.
    Remove calliper from bike, finding all my mineral oil has spilt into the bleed kit box. Problem for later.
    Saw a small incision onto bolt, try screwdriver again. Instantly strips.
    Cut through the bolt in the middle. Still seized
    Try undoing the torx nuts to disassemble the whole calliper. Spins around and nearly slices my finger off with the faced flat mount edge.
    Throw in bin, order new one from Sigma for £48.

    Worst thing is the brake was working fine, just loudly. Should have just left it. Off to France Monday, hoping Sigma’s next day truly is next day 🤞

  • They're all shit, every bike I see with said pad axle gets it removed and threads given a touch of anti seize, or if it's already fucked then either mentioned and ignored until later or fixed with more swearing.

  • Anyone got a lead on:

    105/Ultegra rear callipers in stock
    Shimano brake fluid


    Ideally in a physical shop in London, have seen there’s a few online options but would rather buy from a store.

  • I think I've got some 105 calipers in the workshop, defo GRX, although not London based so would still need posting. Shimano fluid is basically impossible to find still I think, you'll have to make do with something else.

  • Whereabouts are you? I’m in Ipswich

  • Manchester. DM me Monday and I'll see what's knocking about.

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Anyone know anything about disc brakes?

Posted by Avatar for Sanddancer @Sanddancer