Brake Disc Bolt help!

[RickTaff]

Got a Honda CB500 1998 'S' model and needing to replace brake discs. Just after some advice or tips on easiest way to crack the brake disc bolts loose. Those fuckers are threadlocked in there. Allen key heads on them

[RhynoCZ]

1) You want ''impact'' force, not huge amounts of slowly applied torque.

2) Loosen the bolts while the wheel is still on the bike, it will be easier this way.

EDIT: Also make sure the bolt heads (where you stick the allan key) are clean and the ''key'' is properly seated before you start removing the bolts.

I'd do it with a ratchet. An impact driver would be perfect, I guess.
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor

[Pete.]

I hit them with the Rothenberger torch.
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a.k.a 'Geri'

132.9mph off and walked away. Gear is good, gear is good, gear is very very good

[Nobby the Bastard]

Electric or windy gun.
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trevor saxe-coburg-gotha:"Remember this simple rule - scooters are for men who like to feel the breeze on their huge, flapping cunt lips."
Triumph Sprint ST 1050

[stinkwheel]

Heat and a very well fitting hex tool.
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“Rule one: Always stick around for one more drink. That's when things happen. That's when you find out everything you want to know.”
I did the 2010 Round Britain Rally on my 350 Bullet. 89 landmarks, 3 months, 9,500 miles.

[Hong Kong Phooey]

Yep, heat to melt the threadlock, or expand any other corrosive bond. I have a digital heat gun, cheap but good.

Torx fit hex, sometimes better then hex if it's already chewed.
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'81 CG125, '97 FZS600 : '99 CBR600F4, '09 KTM RC8

[Tdibs]

Breaker bar will work too. Clean out the allen with a wire brush/rotary tool first to make sure its snug/hammer it in.
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Previous : 09 Vanvan 125| 02' Sv650s || Current: 1999 Xj600n | 1992 DR650 RSE | 2005 Fazer 1000

[RickTaff]

Thanks guys. All the bolt heads are in good nick, no damage or anything. Dont know the last time they were changed so that is why I am dreading them stripping out.

I do have the option of giving it to the garage to fit for me, but if i can get them off i'll save on labour costs. I hate using allen keys at the best of time, they've a tendency to never sit properly; which is putting me off using an allen key with a breaker bar.

[Suntan Sid]

[Tdibs]

iirc they only have around 15-20nm on them so should undo pretty easily with the breaker.

I'd go for it yourself, I found on my current ride, someone had the wheels sprayed. When putting the discs back on, they crossed threaded one of the bolts in at a angle (I imagine just trying to put it back together fast with a rattle gun..).... Was a fun one to deal with as you can imagine.
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Previous : 09 Vanvan 125| 02' Sv650s || Current: 1999 Xj600n | 1992 DR650 RSE | 2005 Fazer 1000

[1198]

I ended up hammering a slightly oversized Torx driver into my Allen heads as the heads were rounding. Not ideal but they did come out with a struggle.

[kramdra]

Sounds like you havent tried. Thread locked means no rust, slightly more torque than a fresh plain bolt but well within spec. Hex cap heads are harder, less likely to round off than a nornal bolt head. Just use a decent allen key or bit. Disk bolts I have only had problems on a chinese 125 without thread lock and it was cheaper to replace the wheel than buy new bolts!

Decent bolts, 12.9' s from a reputable supplier will never round.

[Nobby the Bastard]

[kramdra]

[RickTaff]

Well, update is that they came out a piece of piss. Stuck allen key into bolt head, tapped it home with a hammer so it was sitting snug. While allen key was seated I gave it a "gentle" tap shall we say anti-clockwise and they cracked loose lovely. We suspected no threadlock was applied when last changed, was there though.

Front and rear discs all done

Fucking rear brake master cylinder needs repairing now... sigh

[Fisty]

[sickpup]

[kramdra]

They were easy to remove once I had established your advice was completely incorrect. Thread lock is specifed in the service manual for most bikes damper bolts and disc bolts.

[sickpup]

[A100man]

Now, now ladies - handbags down.
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Now: A100, GT250A, XJ598, FZ750

Then: Fizz, RS200, KL250, XJ550, Laverda Alpina, XJ600, FZS600

[kramdra]

Ease of removal and dissasembly of components is often not cared for in the design. You seem to think it plays a big part of design choices. Most forks would only be stripped once or twice maximium in a bikes lifetime. You are yet to share your claimed revision to Hondas assembly procedure. Feel free to reply about forks in the fork thread and keep OP's thread on topic.

You are suggesting that disc bolts, calipers, or any other fastners on a bike should never be assembled with the weak blue thread lock, which contradicts all service manuals I have seen.

[sickpup]

[kramdra]

Not quite I made a choice that it wasnt worth the time due to engines being common, cheap and easy to swap on this model, plus many say it is not nessasary.

I have read many manuals. It does state to use thread lock. Im sure you will tell me Honda has changed that too if youd care to back it up.

[RhynoCZ]

Just give OP the credit for overcoming his fear of a failure and move on.
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'87 Honda XBR 500, '96 Kawasaki ZX7R P1, '90 Honda CB-1, '88 Kawasaki GPz550, MZ 150 ETZ
'95 Mercedes-Benz w202 C200 CGI, '98 Mercedes-Benz w210 E200 Kompressor