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Brake pad chamfer?

Posted: Wed Feb 06, 2013 2:31 pm
by David
Image

Just fitting some new pads on the the Pug and was surprised by the amount of chamfer on the pads :shock: Can't think of a good reason for so much. Any ideas?

Re: Brake pad chamfer?

Posted: Wed Feb 06, 2013 3:31 pm
by woody
Looks fine to me, remember fitting a couple of sets of these.

Re: Brake pad chamfer?

Posted: Wed Feb 06, 2013 4:03 pm
by Rich H
Speeds up break in due to higher contact pressure?

Re: Brake pad chamfer?

Posted: Wed Feb 06, 2013 6:18 pm
by David
The geek in me got the better of me and I found this:

http://www.kyu.edu.tw/teacpage/teacpage ... C98-69.pdf

Seems it's to reduce brake squeal and the loss of stability/efficiency that results. The reduce pad area is of little consequence as Amontons law states that friction force remains the same.

:leave

Re: Brake pad chamfer?

Posted: Wed Feb 06, 2013 6:40 pm
by Stu160
Stops Squeal as rar as I know, if you chamfer it down to 3mm, then when they start to sqeal, you need to check the pads.
Really must remember and do this to the next set of pads.....

Stu

Re: Brake pad chamfer?

Posted: Wed Feb 06, 2013 6:58 pm
by BiggestNizzy
David wrote:The geek in me got the better of me and I found this:

http://www.kyu.edu.tw/teacpage/teacpage ... C98-69.pdf

Seems it's to reduce brake squeal and the loss of stability/efficiency that results. The reduce pad area is of little consequence as Amontons law states that friction force remains the same.

:leave
Who knew
http://ocw.mit.edu/courses/physics/8-01 ... lecture-8/

Was going to moan about spending money on wide tyres but.... 3.10
http://ocw.mit.edu/courses/physics/8-01 ... s/sol3.pdf


Re: Brake pad chamfer?

Posted: Thu Feb 07, 2013 9:58 am
by David
:lol:

An interesting subject, brake and tyre sizes are really about heat management and wear rates. 8)

Re: Brake pad chamfer?

Posted: Fri Feb 08, 2013 6:55 pm
by martins
Would you lot get a life, please :D :D :D :D

I will now have to go and read all this geek stuff or I will not be able to sleep.

Stop it please. I have better things to do with my time 8) 8) I think...

M

Re: Brake pad chamfer?

Posted: Wed Mar 06, 2013 12:21 pm
by henrybovis
BiggestNizzy wrote:
David wrote:The geek in me got the better of me and I found this:

http://www.kyu.edu.tw/teacpage/teacpage ... C98-69.pdf

Seems it's to reduce brake squeal and the loss of stability/efficiency that results. The reduce pad area is of little consequence as Amontons law states that friction force remains the same.

:leave
Who knew
http://ocw.mit.edu/courses/physics/8-01 ... lecture-8/

Was going to moan about spending money on wide tyres but.... 3.10
http://ocw.mit.edu/courses/physics/8-01 ... s/sol3.pdf

That took me back a bit, god I hated being a student!

Re: Brake pad chamfer?

Posted: Wed Mar 06, 2013 8:14 pm
by martins
:D :D
BiggestNizzy wrote:

David wrote:The geek in me got the better of me and I found this:

http://www.kyu.edu.tw/teacpage/teacpage ... C98-69.pdf

Seems it's to reduce brake squeal and the loss of stability/efficiency that results. The reduce pad area is of little consequence as Amontons law states that friction force remains the same.




Who knew
http://ocw.mit.edu/courses/physics/8-01 ... lecture-8/

Was going to moan about spending money on wide tyres but.... 3.10
http://ocw.mit.edu/courses/physics/8-01 ... s/sol3.pdf

That took me back a bit, god I hated being a student!

FFS. We is not all engineers.

Stamp on the brake pedal, the car stops. Take your foot off the brake pedal the car un-stops....Unless you have a real old and dodgy S1 or a water bottle under the brake pedal. Simples. 8)

Re: Brake pad chamfer?

Posted: Wed Mar 06, 2013 10:17 pm
by BiggestNizzy
martins wrote:
FFS. We is not all engineers.

Stamp on the brake pedal, the car stops. Take your foot off the brake pedal the car un-stops....Unless you have a real old and dodgy S1 or a water bottle under the brake pedal. Simples. 8)
The car doesn't "un-stop" when you take your foot of the brake. The accelerator makes the car "un-stop" or using the technical term go.

:wink:

Re: Brake pad chamfer?

Posted: Wed Mar 06, 2013 11:31 pm
by martins
The car doesn't "un-stop" when you take your foot of the brake. The accelerator makes the car "un-stop" or using the technical term go.
Now we are getting somewhere. The above is far easier to understand than the man from MIT (Mind Induced Tedium).

You may have surmised by now I aint an en-gi-neer :D :D :D :D :D

M

Re: Brake pad chamfer?

Posted: Thu Mar 07, 2013 4:17 pm
by flyingscot68
Accelerate = un-stop
Brake = un-go

I like that :thumbsup