Calling all hydraulic brake road bike users

[dan_bo]

mine rub for a moment or two after a big stop but then it passes.

 

[Cycleops]

I've got some Tektro mechanical discs and they work perfectly with no issues.
Perhaps you need to change.

 

[Yellow Saddle]

Can you let me know whether you suffer from the same as me? I have a road bike with Ultegra level hydraulic discs. It's done about 300 miles. When I brake on any descent the pads rub for about 10 seconds afterwards and then stops. This can only be down to heat build up, but bearing in mind we are only in Spring and it's not particularly warm it's worrying what it's going to be like in the summer.
I've centred the rotor to the caliper, cleaned everything including the Pistons, the rotor is pretty much straight and there is a gap either side of the rotor.
Two bike shops have told me they all do this and can't be improved, is this right? If not what can be done?
Fairly new to discs and already starting to regret the switch, bearing in mind I'm a bit OCD about bike noises.

I don't understand the problem. What do you mean by "When I brake on any descent the pads rub for about 10 seconds afterwards and then stops"?

Edit: OK, I now understand what's going on.

 

[Yellow Saddle]

I've got some Tektro mechanical discs and they work perfectly with no issues.
Perhaps you need to change.

Please no. I'd rather put my rooster on an anvil and hit it with a hammer than go for that "solution".

 

[Cycleops]

Please no. I'd rather put my rooster on an anvil and hit it with a hammer than go for that "solution".

.
Why not? Obviously the hydraulic stuff isn't doing the job.

 

[cubey]

mine rub for a moment or two after a big stop but then it passes.

Mine too.

 

[Kbrook]

I don't under stand the problem. What do you mean by "When I brake on any descent the pads rub for about 10 seconds afterwards and then stops"?

At the end of a descent I can hear the pad rubbing , then as I keep riding the noise stops. The rubbing only lasts a few seconds. Sorry not sure how to explain it further. It can only be a heat issue, I think!

 

[Yellow Saddle]

At the end of a descent I can hear the pad rubbing , then as I keep riding the noise stops. The rubbing only lasts a few seconds. Sorry not sure how to explain it further. It can only be a heat issue, I think!

Thanks, I got it as per my edit. I'm slow tonight. Must be the brand of Rioja that's not up to scratch.

 

[Yellow Saddle]

At the end of a descent I can hear the pad rubbing , then as I keep riding the noise stops. The rubbing only lasts a few seconds. Sorry not sure how to explain it further. It can only be a heat issue, I think!

Do you have those fancy aluminium/stainless sandwich discs?

 

[dan_bo]

Do you have those fancy aluminium/stainless sandwich discs?

I do.

 

[Kbrook]

Do you have those fancy aluminium/stainless sandwich discs?

Shimano ice tech things 160mm

 

[Yellow Saddle]

I do.

Shimano ice tech things 160mm

Aluminium expands slightly more than stainless steel when heated. But, the expansion is very small. Yet, I wonder if that is what's happening here. The discs expand, rub and then cool down.

This could be tested experimentally if you have some sort of small controllable flame thrower handy. Put the bike in a stand, spin the wheel and then heat the spinning disc and see if it starts to rub. You could also use a heat gun if a flame thrower isn't in your garage arsenal.

It's a long shot.

 

[Kbrook]

Thanks I do gave a heat gun, but I'm so careless I'll probably melt something I shouldn't. I'm going to have another play with them, funny that both bike shops suggest that they all do this. To any normal person this wouldn't be an issue as it doesn't affect performance, just annoying for me.

 

[Yellow Saddle]

Thanks I do gave a heat gun, but I'm so careless I'll probably melt something I shouldn't. I'm going to have another play with them, funny that both bike shops suggest that they all do this. To any normal person this wouldn't be an issue as it doesn't affect performance, just annoying for me.

It would be nice if you do try. Just aim the gun so that it only hits the disc and do it at an angle so that it reflects away from the fork and caliper. That would confirm the theory, I think. Spinning spokes won't heat up at all.

 

[dan_bo]

Aluminium expands slightly more than stainless steel when heated. But, the expansion is very small. Yet, I wonder if that is what's happening here. The discs expand, rub and then cool down.

This could be tested experimentally if you have some sort of small controllable flame thrower handy. Put the bike in a stand, spin the wheel and then heat the spinning disc and see if it starts to rub. You could also use a heat gun if a flame thrower isn't in your garage arsenal.

It's a long shot.

I wish I could be arsed.