Chamfer brakepads, why?

[Mouse]

Other than solving braking noise, what is the reason of manufacturer chamfering their pads. I notice most of the manufacturer dont do that, but EBC and Jurid chamfer theirs. Assuming they chamfer 10% each at both end, the contact surface between the disc and pads is lesser. hence, instead of producing a 100% flat pad surface to get the maximum gripping power, why do some company chamfer their brand new factory pads?

 

[ichiwan2]

Reduces the likelihood of brake squeel.

Your brake disc has furrows and ridges. So when the brake pedal is pressed lightly, it will hit the ridges first - gives you the squeel.

 

[Mouse]

Just got a reply from Jurid and thought of sharing with u guys, below is the email

Sent: Sunday, 29 October 2006 3:46 PM
To: Holts-Enquiry (AS01)
Subject: Jurid brakepads

Hi, i just brought a set of front Jurid brakepad for my BMW E46 318i. I
notice that the brakepad have been chamfer at both end. Why is the pad
chamfer? Assuming both end have been chamfer 10% each, hence the total
contact surface of the pads to the disc is lesser. Isn't that dangerous?
-
----Original Message-----
From: Holts-Enquiry (AS01)
Sent: Monday, October 30, 2006 6:05 AM

Subject: FW: Jurid brakepads

You have contacted Honeywell Australia.
I have forwarded you email to Honeywell Asia, who should be able to
assist.

Regards and thanks
Helen Sese
Honeywell - Holts Australia
T: 61 2 9353 8152
F: 61 2 9353 8150
E: helen.sese@honeywell.com

Date: Tue, 31 Oct 2006 10:05:52 +0800From: Wee Choe Heong

Dear Mouse,

Good morning !

I am Ms Wee from ACTION AUTO AGENCY (M) SDN BHD, the sole distributor of JURID DISC PADS from Malaysia.

I understand that you have the doubts why are the JURID brake pads chamfer at the edge. In fact, this is special designed to get rid of the noise that cause by the friction between disc pads and disc rotors and it does not affect the braking performance of the pads.

We are located at 30, JALAN SEGAMBUT PUSAT, SEGAMBUT, 51200 KUALA LUMPUR. Tel : 03-6258 5868.

Please do contact us if you have other inquiry pertaining to JURID DISC PADS.

Regards
Thank you.

Wee

 

[Jules]

.....if tyres contact patch is all that matters, we will be putting on the widest tyres we can find.

same analogy here for brake pads cos they would calculated the correct surface area for the friction coefficient they want to achieve/advertise/claim. Yes. the matterial below the chamfer is wasted at the start but as the pad wears, the area actually increases......and the noise starts too.

In summary, chamfers are for noise, squeel reduction.

have fun!

 

[Mouse]

Date: Mon, 6 Nov 2006 12:16:01 +0100From: "Gemmel, Jens"
Dear Mr. Tan,
thank you for your request and for buying our products.
Honeywell Friction Material is one of the world largest OE brake pad producer.
We supply all big car manufacturers and we develop together the brake systems to get best brake performance.
Chamfers are for different purposes and mainly for reduction of noise.
So far you can trust our experiences and our products.
Best Regards
We wish you good safe drive and always a good brake performance.
Jens Gemmel