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Can anyone help with this problem, please?

Whenever I brake with the front brake, I always get the angry bee sounds.
Bike: Canyon Endurace (2020).
Brakes: Shimano 105 R7070 hydraulic.
Pads: Shimano K03S Resin.

I’ve cleaned the pads, brake housing and calipers, even flossing them with string.
Plus bleeding them, removing all air bubbles, and pressing the calipers back out. And also forcing the pad spring further apart with screwdriver shaft.

But after 2 rides the noise returns.
The pads aren’t brand new, maybe half way through their lifecycle.
They seem to be closing in simultaneously.

Do you think I should take the brake housing apart, so I can properly clean the calipers?

Thank you.

Topic

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LOL, nice one
LOL, nice one 🙂
I never thought about heat resistant paint. Thanks.

The bees have returned. But I’m still waiting for the new pads to arrive.
So I’ll put up with them for now.

[Pilot Pete]

0-0 wrote:

0-0 wrote:

I’m now looking forward to trying out the new rotors. I thought I’d try Ali Express for once. 2 x 160mm approx £60 with PP https://www.aliexpress.com/item/32857520478.html A bit of masking tape and black spray paint and I’ll upgrade them to the Dura Ace version ;-)

You won’t get me included for £60….

The black does look good on Dura Ace, make sure you use heat resistant paint!

PP

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I’m now looking forward to
I’m now looking forward to trying out the new rotors.

I thought I’d try Ali Express for once. 2 x 160mm approx £60 with PP
https://www.aliexpress.com/item/32857520478.html

A bit of masking tape and black spray paint and I’ll upgrade them to the Dura Ace version 😉

[Pilot Pete]

Good news! I thought it was

Good news! I thought it was probably rotor design coupled with pad wear….

PP

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Switching the rotors around
Switching the rotors around has cured the buzzing sound… for now 🙂

I’ll order some Shimano Ultegra RT800 – Ice Tech FREEZA Disc Rotors

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Thank for the suggestion
Thank for the suggestion 🙂

[Podc]

Also check that the hose

Also check that the hose connection to the caliper is tight – a very slight fluid leak will make the brakes squeal.

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I’ll try scratching them
I’ll try scratching them first. As I’ve got some new replacements on order.
Thank you for the help.

[0-0]

Will do.
Thank you.
Will do.
Thank you.

[Rome73]

The pads may be clean but

The pads may be clean but they may also be glazed. Replace them and see (hear) what happens. Or ‘scratch’ them.

[Pilot Pete]

I’ve never greased the backs

I’ve never greased the backs of disc pads other than using coppaslip grease on car brake pads many moons ago when I did my own car maintenance!

I would try the other things first, before shelling out on grease as it probably won’t cure your problem (it can help with squealing brakes). As yours aren’t squealing I don’t think they are resonating. I’m pretty sure the pads are worn…if the other checks don’t sort it you could then try grease.

PP

[0-0]

A question about the high
A question about the high temperature grease.
This might be a stupid question or genius, you decide 😉

Instead of buying a tub of high temp grease and having basically a full tub after I’ve applied a dab to the back of the pads.
Could I use thermal paste, which is used on the back of CPU chips in your PC?

[0-0]

I would have thought the end
I would have thought the end cap was removable.
But when I lightly gripped in a vice, it didn’t want to move, and I didn’t want to damage it by gripping it tighter.
I’ve just ordered a new cassette tool which will fit over the cap.
I will then swap the rotors around.

I’ve also ordered some sintered pads too.

Thank you very much for your help 🙂

[Pilot Pete]

And my final suggestion for

And my final suggestion for the noise is worn pads. Fronts will wear out quicker than rears under proper braking technique, hence why you are getting it with the front brake only, and mine start to make a buzzing sort of sound when worn to limits (from memory 0.9mm of pad material remaining).

I always have two sets of new pads hanging above my workbench ready to fit. It’s a 5min job and I’d certainly check and even swap your rears to the front to see if it cures the issue.

PP

[Pilot Pete]

Depending on the rotor style,

Depending on the rotor style, those with ‘big’ holes in can cause more noise under braking. I swapped to Dura Ace Freeza rotors on one bike and they don’t make any noise compared to the previous original rotors which had much bigger square shaped holes and made a sort of buzz noise under braking.

PP

[Author]

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