Disc Rub After Heavy Braking

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mogwaiboi
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Disc Rub After Heavy Braking

Postby mogwaiboi » Mon Aug 06, 2018 7:08 pm

Hi All

I upgraded the rotors to the Icetech type on my Giant TCX recently. I centred the pads as per usual and the back rotor isn't rubbing when I spin the wheel, but after heavy braking there is a loud sound for at least 5-10 seconds that I assume is the rotor rubbing against the pads. Has anyone else come across this before?
By the way, I did sand the pads back to remove any glaze and to level them out, but is it normally recommended to replace pads as well when changing rotors?

Thank you!
In search of up - Hells 500

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Duck!
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Re: Disc Rub After Heavy Braking

Postby Duck! » Mon Aug 06, 2018 7:22 pm

SRAM brakes?
I had a thought, but it got run over as it crossed my mind.

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mogwaiboi
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Re: Disc Rub After Heavy Braking

Postby mogwaiboi » Mon Aug 06, 2018 8:01 pm

Shimano RS505 hydraulic
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TheWall
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Re: Disc Rub After Heavy Braking

Postby TheWall » Mon Aug 06, 2018 9:41 pm

Happens on mine as well (Shimano Durace Hydraulic). Not sure why but it goes away as quickly as it comes.

jackthelad
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Re: Disc Rub After Heavy Braking

Postby jackthelad » Mon Aug 06, 2018 10:40 pm

Do Not Clean the Rotors on a regular Basis
The Brake Pad Material, is what the BrakePads Key too

I See and Here it all the Time, at the Bikeshops,
when roadies talk cleaning bikes..
Disc Brakes are a Superior System than rim brakes, meaning you Do Not ,
Do Not have to clean the pads or Disc , Between Pad Changes.

If you are worried about Disc Rotors and Pad Thickness,
Get a Pair of Veneer Calipers and Measure the Thickness of pad material,
minus the Backing Plate , and the Thickness of the Rotor, Before swapping Out.

I have Had Rotors longer than 5 years.

Less is more with Disc Brakes,
The More you Clean the Discs, the More you have to Lay fresh Pad material on the Disc
The Faster, you go through your Pads.....laying it on your Rotors
Viscous Circle...

I use Automotive Disc Brake Cleaner, when i clean my Rotors, Not Soap and Water...
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jackthelad
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Re: Disc Rub After Heavy Braking

Postby jackthelad » Mon Aug 06, 2018 10:45 pm

Oh and the Sound you here is Because Shimano Icetech Rotors are made from 2 materials, The Steel/Aluminium, have different Ratios of Heat Expansion, probably resulting is Disc Warping as they Cool Down... Proper Steel Rotors For The Win.

https://sram.zendesk.com/hc/en-us/artic ... my-rotors-

https://www.velonews.com/2011/10/mtb/te ... les_252053

http://forums.mtbr.com/brake-time/rotor ... 41316.html
Last edited by AUbicycles on Wed Aug 08, 2018 10:18 pm, edited 1 time in total.
Reason: Mod Edit: Corrected Spelling mistake which was misleading.
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mogwaiboi
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Re: Disc Rub After Heavy Braking

Postby mogwaiboi » Tue Aug 07, 2018 5:31 pm

Thanks for the replies and insight.
'Shitmano' (as you say) must be doing something right...just a couple of bikes around with it, and most people happy. Each to their own I guess.
In search of up - Hells 500

Jmuzz
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Re: Disc Rub After Heavy Braking

Postby Jmuzz » Wed Aug 08, 2018 6:30 pm

They are weak aluminium for weight and bend really easy.
My front wheel fell over on carpet before fitting and that put a bend in it before it even saw the bike, took very little finger pressure to bend it back.
The rear got bent when swinging around lubing chain, tapped PVC pipe on wall, bent a mm.

Even though bent back near straight they sometimes start rubbing for a while.

RS505 calipers and levers too, so perhaps they don't spring back as well as newer series?

These Ultegra/Dura-Ace icetech rotors are intended for fragile road bikes so have to be careful. More robustness would be nice though.

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