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Why is there so much area left?

  • Thread starter Thread starter mgcook
  • Start date Start date Mar 20, 2007
M

mgcook

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Jan 15, 2007
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#1
  • Mar 20, 2007
  • #1
I'm replacing my front brakes. Everything is the right part #'s. But after looking, why are my pads so much smaller than the actual rotor...it looks like the pads would cover alot more area on the rotor than they actually do...i see no point in a 13" rotor if the pad can't cover every bit of it

pics:

 

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95BlueStallion

My assy trans to myself
15 Year Member
Feb 22, 2007
5,125
3,091
214
Cedar Rapids, Iowa
Mar 20, 2007
#2
  • Mar 20, 2007
  • #2
That pad doesnt look right... I dont have 13" rotors, but I agree that the pad should cover more surface area. I would talk to whoever you ordered them from...
 
M

mgcook

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#3
  • Mar 20, 2007
  • #3
the pads came from summit. they are the correct pads. and the rotors are the correct ones as well
 

The Green GT

No 13 year olds are safe around me.
10 Year Member
Jan 8, 2006
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Louisiana
Mar 20, 2007
#4
  • Mar 20, 2007
  • #4
They are going to be a little small, but I think that looks a little too small.
 
B

bimmertech

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merriam, ks
Mar 20, 2007
#5
  • Mar 20, 2007
  • #5
and that is why i don't like cobra brakes----thats the way its supposed to be.

might wanna spray some paint around the inside to keep the rotor from rusting and looking like ****.
 
M

mgcook

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#6
  • Mar 20, 2007
  • #6
bimmertech said:
and that is why i don't like cobra brakes----thats the way its supposed to be.

might wanna spray some paint around the inside to keep the rotor from rusting and looking like ****.
Click to expand...

i guess i'll see once i get the stock ones off...but the rotors are covered up so they won't rust.
 

trav_19

New Member
Oct 29, 2006
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Jackson, MI
Mar 20, 2007
#7
  • Mar 20, 2007
  • #7
your rotors are covered up....how does that work?? what did you use to cover them? or are you talking there covered before they go on??... i never understood what good a larger rotor will do for you when your braking contact patch is the same size.....
 

The Green GT

No 13 year olds are safe around me.
10 Year Member
Jan 8, 2006
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Louisiana
Mar 20, 2007
#8
  • Mar 20, 2007
  • #8
trav_19 said:
your rotors are covered up....how does that work?? what did you use to cover them? or are you talking there covered before they go on??... i never understood what good a larger rotor will do for you when your braking contact patch is the same size.....
Click to expand...

I think that if the area of contact is further from the center of the rotating mass then it will stop better. Next time you have your front jacked up get the wheel spinning and try to stop it with your hand on the tread, then try again with your hand somewhere closer to the lugs.
 

Black95GTS

Active Member
Jan 8, 2004
1,644
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Marlborough, MA
Mar 21, 2007
#9
  • Mar 21, 2007
  • #9
The Green GT said:
I think that if the area of contact is further from the center of the rotating mass then it will stop better. Next time you have your front jacked up get the wheel spinning and try to stop it with your hand on the tread, then try again with your hand somewhere closer to the lugs.
Click to expand...

This is absolutely correct. You can apply exponentially more force on a rotating object by increasing the tangential distance of the force applied to that object. It's called increasing the moment arm of the system.

The other way you can make your brakes work harder to is install calipers with more clamping force (your brembo's, etc with 4-6 pistons). This will increase the coefficient of friction that the rotor's experience.

Adam
 

1TallMF

New Member
Apr 17, 2006
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Montreal
Mar 21, 2007
#10
  • Mar 21, 2007
  • #10
Wow, I had no idea Cobra pads were that small...
 

ProKiller

Founding Member
Apr 26, 2002
3,064
15
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PA
Mar 21, 2007
#11
  • Mar 21, 2007
  • #11
Black95GTS said:
This is absolutely correct. You can apply exponentially more force on a rotating object by increasing the tangential distance of the force applied to that object. It's called increasing the moment arm of the system.

The other way you can make your brakes work harder to is install calipers with more clamping force (your brembo's, etc with 4-6 pistons). This will increase the coefficient of friction that the rotor's experience.

Adam
Click to expand...

huh?

haha, some really engineering explinations. top quality
 

trav_19

New Member
Oct 29, 2006
810
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Jackson, MI
Mar 21, 2007
#12
  • Mar 21, 2007
  • #12
oh well my stock ones stop the car....this cars not a nascar or nothing stockers work just fine for me
 

'94ChickStang

Member
Sep 27, 2004
301
0
17
northern ca
Mar 21, 2007
#13
  • Mar 21, 2007
  • #13
That's how my bullitt brakes are and that's how it's supposed to be, just paint the rotor with clear high temp paint so the inside ring that the pads miss don't rust....
 
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