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Dibby
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Blue Brake Discs?

Not entirely an Alfa question but kind of car related.

I've got a nice set of discs for the mountain bike and the lad I bought them off is a bit of a large chap ... 20 stone +
He's had them glowing on teh Alpine descents and they've blued with a nice blue/ black glaze. Will this affect braking performance? Google gives conflicting results of 'leave it alone, it'll be fine' or 'discs should be re-faced or replaced'

It could be different for cars and you have to have them replaced for the MOT if they're nackered but does bluing affect performance or is it mainly cosmetic? Discs are £40 each for the mountain bike and I don't want to replace them if a bit of wet & dry will bring them back to life again. They haven't quite got the ferocious bite 6 pots should give on a pushbike but the new pads haven't had a chance to bed in yet and I'm wondering if the discs are also to blame.
 
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Re: Blue Brake Discs?

Blue is fine, I'd leave it!!

Just means they have been cooked as you know!
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Re: Blue Brake Discs?

The blue colour is caused by surface corrosion due to increased reaction of the metal with oxygen in the air when the metal gets red hot. It is evident on exhaust manifolds and cat shells in heavily tuned cars as well as brake discs. No need to worry, it is only skin deep and will go away in a couple of weeks of normal driving.
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Re: Blue Brake Discs?

Cheers guys I'll leave off forking out for 2 new discs and wait for the pads to bed in.

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Just means they have been cooked as you know!
That's why I bought them off him, if they stand up to stopping 20 stones worth of him and a monster of a bike on top without boiling the fluid or popping a seal they'll stand up to my Alpine runs easy.
 
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Re: Blue Brake Discs?

Maybe he should be riding up hill to save his brakes and trim a few stone?
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Re: Blue Brake Discs?

In all fairness to him he's a fit lad underneath all that padding, we got through 700 miles in 10 days at uni, we got bored in the Easter holidays so rode round the country (on road on fat, nobbly tyres packed up with panniers) visiting people and he was out-climbing me most of the way.

But he could do with shifting quite a bit of that padding, saves on body armour!
 
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Re: Blue Brake Discs?

the fluid could have boiled, I did this many times on my MTB discs but its simple enough to bleed them though

what brakes are they and what size discs are they?
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Re: Blue Brake Discs?

They're Hope 203mm saw-tooth floating discs front & back with Moto M6 calipers. The fluid usually goes spongey and leaks out all over the place if they boil from what I've seen but I'll give them a bleed with fresh fluid anyway after he's been at them!

Love how easy the Hopes are to bleed, had a Mono M4 & Mono Mini on there before, not enough power to stop a downhiller so they can go back on the XC bike and I can finally get shot of the Hayes HFX9s on the XCer, those things were a nightmare to set up and bleed.




Damn bike, spent 2 days drilling out a seized and rounded off crank bolt with a bunch of blunt drill bits, finally got the bugger loose tonight so I can get a new BB ordered, it's coming together nicely for the springtime
 
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Re: Blue Brake Discs?

never needed to drill the crank bolts before

I used to use hope, switched to hayes mag 8"

but hope are cool
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Re: Blue Brake Discs?

i have 4 piston hyd hope brakes on mine had to get hope to make a bespoke front disc as the mount on the fork rerquired a further bracket to fit the caliper on think it was around 220mm
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Re: Blue Brake Discs?

have you tried hope discs machined with text of your choice??
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Re: Blue Brake Discs?

nope didn't know they did that


id have "f*** this hill didn't look this steep on map"
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Re: Blue Brake Discs?

To turn steel blue it needs to be heated to around 300 deg C as shown in a tempering colours chart. That's a pretty hot brake. Do you guys have a death wish

Steel Heat and Tempering Colours
 
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Re: Blue Brake Discs?

mine just said azonic racing the middle of the G fell out
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Re: Blue Brake Discs?

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Originally Posted by explosive alfa View Post
never needed to drill the crank bolts before
Nor me

The guy who I bought the bike off had rammed the drive side bolt in there and rounded the allen head off, no amount of dismantling oil and rocking would budge it so the drill was the last resort.

What do you ride EA?

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Originally Posted by ricey25 View Post
i have 4 piston hyd hope brakes on mine had to get hope to make a bespoke front disc as the mount on the fork rerquired a further bracket to fit the caliper on think it was around 220mm
They're good at these custom jobs over at Hope, whatever size, whatever colour anodising, they'll do it. Have you got the right mount? There are all sorts of mounts about for all sorts of forks for all sizes of disc


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To turn steel blue it needs to be heated to around 300 deg C as shown in a tempering colours chart. That's a pretty hot brake. Do you guys have a death wish

Steel Heat and Tempering Colours
That's a pretty handy chart. Cheers for that one.
It's great fun scaring yourself almost to death, great adrenaline rush when you clear a jump that gave a mate a wrist full of pins. Although downhilling is a lot safer than road riding.
 
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Re: Blue Brake Discs?

i don't ride any more but i was on a rocky mountain rm7 and before that it was a azonic eliminator (hence te custom discs)
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Re: Blue Brake Discs?

Some tasty kit, wonder if Hope will machine up discs with Hayes logos on them

Here's my Big Hit, taken this weekend:
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File Type: jpg n675140556_6013262_1001391.jpg (65.2 KB, 11 views)
 
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Re: Blue Brake Discs?

heres my rocky mountain

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Re: Blue Brake Discs?

Nice one, looks like a nice muddy day out there!
 
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Re: Blue Brake Discs?

just a bit
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Re: Blue Brake Discs?

heres a collection of my others

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Re: Blue Brake Discs?

Are those Shivers on the Azonic, that's one set of beefy forks.



I love coming home caked head to toe in mud, standing in the doorway with a 'Giz a huuuug'

Just before I'm booted into the shed to get undressed in the cold
 
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Re: Blue Brake Discs?

Quote:
Originally Posted by Dibby View Post
Are those Shivers on the Azonic, that's one set of beefy forks.



I love coming home caked head to toe in mud, standing in the doorway with a 'Giz a huuuug'

Just before I'm booted into the shed to get undressed in the cold
i ws on the train once covered completly should have seen the looks!
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Re: Blue Brake Discs?

yep those are shivers 2002 models iirc, been along time for me stopped riding about 3 years back
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Re: Blue Brake Discs?

I so wanted this bike! its my best mates bike and a very nice nac nac

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