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My son has an aluminium bike. Him being what he is, the bike has been left out in all weathers including a fair amount of salty Welsh rain.
The threaded bolt that holds the brake caliper to the frame appears to have seized into the frame, and I suspect it's done the dreaded aluminium/steel galvanic corrosion thing.
Any suggestions for removing it?
I guess heating up the frame might work, I'll try that first.
IME it's not usually corrosion, it's simply dirt that jams the nut in place - if you can find a long 6mm screw and screw it in to the nut from the front and give it a firm tap with a hammer
Soak it in a bit of Plus Gas or penetrating fluid. WD-40 may even be enough. Good amount of leverage with decent quality allen key that's less likely to round it.
Whatever you do, make sure you use a decent hex key (my pesonal favourite for this type of job is Wera Hex-Plus), if you round out the head with a crappy one, it'll be a nightmare for the next person involved.
Ive had one corrode once, it came out easily as there weren't any threads left! Thankfully on a singlespeed with replaceable dropouts.
If it wont come out then hex head screws are a doddle to drill the heads off as the drill sits nice and centered! Just drill untill the head comes off, then once the calliper is off and there isnt any tension on the shaft it will come out by hand or with a pair of molgrips (or worst case file a flat onto each side so you get more grip).
Is the screw actually into the frame? I'm just thinking about all the bikes I've had and none of them had a mounting configuration where the bolts screw directly into the frame. They usually pass through the frame mounts and into a calliper mount/ adapter. My road bike with flat mounts does (inserts in the carbon frame) but not my MTB's or steel commuter.
It will screw in if it's post mount, otherwise IS screws into the caliper.
The hex bolt was rounded off in my earlier attempts to remove it.
In the end I cut through the bolt on the caliper side. After that a combination of squirting with GT85 and heating it up lots with my amazing industrial hair dryer did the trick.
If anyone needs a half-inch stub of rusty threaded bar, PM me!