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#11
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2004 camry le 4 banger - how do I find the right front brake pads
On Tue, 12 Nov 2019 13:43:03 -0700, Ohderii_Cruiser wrote:
> Centric 301.09080 stamped CEN 30109080 31AC9101 GG 02 B19 > http://img4.imagetitan.com/img.php?image=20_02.jpg > > Four steel rubberized backing plates came with the 4 front pads. > http://img4.imagetitan.com/img.php?image=20_03.jpg > > The hardware kit P117.44068 came with 4 holding clips & 2 wear sensors. > http://img4.imagetitan.com/img.php?image=20_01548.jpg > > Does anyone know why the deep slit in the friction material is there? I don't know why the deep slit. Maybe it's a manufacturing requirement? Or for a wear indicator? Or maybe for noise? Or for water? The edge codes are explained here. http://www.safebraking.com/brake-pad...-counterfeits/ I didn't find your edge code in this 2011 AMECA List of Edge Codes document http://www.safebraking.com/wp-conten...-May-20112.pdf It wasn't in the 2014 AMECA list of edge codes either. https://docplayer.net/15631715-Ameca...-material.html Maybe they're counterfeit? |
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2004 camry le 4 banger - how do I find the right front brake pads
On 13/11/19 7:43 am, Ohderii_Cruiser wrote:
> Ohderii_Cruiser > suggested:\It > turns out the friction code is GG for the Centric pads. > Centric 301.09080 stamped CEN 30109080 31AC9101 GG 02 B19 > http://img4.imagetitan.com/img.php?image=20_02.jpg > > Four steel rubberized backing plates came with the 4 front pads. > http://img4.imagetitan.com/img.php?image=20_03.jpg > > The hardware kit P117.44068 came with 4 holding clips & 2 wear sensors. > http://img4.imagetitan.com/img.php?image=20_01548.jpg > > Does anyone know why the deep slit in the friction material is there? > It's to remove gas buildup from between the pads and the discs. It's the exact same reason discs are often slotted or drilled. If the gasses from the pad surfaces, that build up under extreme braking, isn't provided with an escape path, the pads act like mini hovercrafts skating over (*above*) the disc surface resulting in a total *loss* of friction. Guess what that does to your braking ability! -- Xeno Nothing astonishes Noddy so much as common sense and plain dealing. (with apologies to Ralph Waldo Emerson) |
#13
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2004 camry le 4 banger - how do I find the right front brake pads
Xeno > suggested:\
> On 13/11/19 7:43 am, Ohderii_Cruiser wrote: >> Ohderii_Cruiser > suggested:\It >> turns out the friction code is GG for the Centric pads. >> Centric 301.09080 stamped CEN 30109080 31AC9101 GG 02 B19 >> http://img4.imagetitan.com/img.php?image=20_02.jpg >> >> Four steel rubberized backing plates came with the 4 front pads. >> http://img4.imagetitan.com/img.php?image=20_03.jpg >> >> The hardware kit P117.44068 came with 4 holding clips & 2 wear sensors. >> http://img4.imagetitan.com/img.php?image=20_01548.jpg >> >> Does anyone know why the deep slit in the friction material is there? >> > It's to remove gas buildup from between the pads and the discs. It's the > exact same reason discs are often slotted or drilled. If the gasses from > the pad surfaces, that build up under extreme braking, isn't provided > with an escape path, the pads act like mini hovercrafts skating over > (*above*) the disc surface resulting in a total *loss* of friction. > Guess what that does to your braking ability! Is that gas discharge why the edges are chamfered also? http://img4.imagetitan.com/img.php?image=20_03.jpg |
#14
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2004 camry le 4 banger - how do I find the right front brake pads
On 14/11/19 2:22 am, Ohderii_Cruiser wrote:
> Xeno > suggested:\ >> On 13/11/19 7:43 am, Ohderii_Cruiser wrote: >>> Ohderii_Cruiser > suggested:\It >>> turns out the friction code is GG for the Centric pads. >>> Centric 301.09080 stamped CEN 30109080 31AC9101 GG 02 B19 >>> http://img4.imagetitan.com/img.php?image=20_02.jpg >>> >>> Four steel rubberized backing plates came with the 4 front pads. >>> http://img4.imagetitan.com/img.php?image=20_03.jpg >>> >>> The hardware kit P117.44068 came with 4 holding clips & 2 wear sensors. >>> http://img4.imagetitan.com/img.php?image=20_01548.jpg >>> >>> Does anyone know why the deep slit in the friction material is there? >>> >> It's to remove gas buildup from between the pads and the discs. It's >> the exact same reason discs are often slotted or drilled. If the >> gasses from the pad surfaces, that build up under extreme braking, >> isn't provided with an escape path, the pads act like mini hovercrafts >> skating over (*above*) the disc surface resulting in a total *loss* of >> friction. Guess what that does to your braking ability! > > Is that gas discharge why the edges are chamfered also? > http://img4.imagetitan.com/img.php?image=20_03.jpg No, the chamfer helps to reduce noise - as in brake squeal. It prevents the pads developing a high speed chatter (vibration) that creates the squeal. It is also the function of the shims behind the pad. Some people use brake paste behind the pad to dampen the chatter thereby reducing the squealing tendency. Whatever works... It also promotes even pad wear - so they say - but I'm not sure how it manages that. -- Xeno Nothing astonishes Noddy so much as common sense and plain dealing. (with apologies to Ralph Waldo Emerson) |
#15
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2004 camry le 4 banger - how do I find the right front brake pads
Xeno > suggested:\
>> Is that gas discharge why the edges are chamfered also? >> http://img4.imagetitan.com/img.php?image=20_03.jpg > > No, the chamfer helps to reduce noise - as in brake squeal. It prevents > the pads developing a high speed chatter (vibration) that creates the > squeal. It is also the function of the shims behind the pad. Some people > use brake paste behind the pad to dampen the chatter thereby reducing > the squealing tendency. Whatever works... > > It also promotes even pad wear - so they say - but I'm not sure how it > manages that. Thanks for explaining the chamfer is to reduce noise. I had asked the internet supplier for pads meeting the OE spec. He gave me these Centric GG pads which are "ceramic". Do you think a GG NAO or ceramic or semi-metallic would brake the same? |
#16
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2004 camry le 4 banger - how do I find the right front brake pads
On 14/11/19 3:50 am, Ohderii_Cruiser wrote:
> Xeno > suggested:\ >>> Is that gas discharge why the edges are chamfered also? >>> http://img4.imagetitan.com/img.php?image=20_03.jpg >> >> No, the chamfer helps to reduce noise - as in brake squeal. It >> prevents the pads developing a high speed chatter (vibration) that >> creates the squeal. It is also the function of the shims behind the >> pad. Some people use brake paste behind the pad to dampen the chatter >> thereby reducing the squealing tendency. Whatever works... >> >> It also promotes even pad wear - so they say - but I'm not sure how it >> manages that. > > Thanks for explaining the chamfer is to reduce noise. > I had asked the internet supplier for pads meeting the OE spec. > He gave me these Centric GG pads which are "ceramic". > Do you think a GG NAO or ceramic or semi-metallic would brake the same? Probably not since they are different compounds. Since all might be GG rated, then the actual braking effect itself might match to a degree, where they will differ is in their ability to handle and dissipate heat and, equally importantly, manage *disc rotor wear*. Bottom line, your choice of brakepad type will be determined by your driving style. The ceramics would be fine for most use and their manner of operation tends to contribute to longer disc life. On the other hand, if you tow heavy loads or are a bit of a tearaway and brake hard, low metallic or semi metallic might work better for you. The downside will be that those pads will wear the disc much more. -- Xeno Nothing astonishes Noddy so much as common sense and plain dealing. (with apologies to Ralph Waldo Emerson) |
#17
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2004 camry le 4 banger - how do I find the right front brake pads
Xeno > suggested:\
>> Thanks for explaining the chamfer is to reduce noise. >> I had asked the internet supplier for pads meeting the OE spec. >> He gave me these Centric GG pads which are "ceramic". >> Do you think a GG NAO or ceramic or semi-metallic would brake the same? > > Probably not since they are different compounds. Since all might be GG > rated, then the actual braking effect itself might match to a degree, > where they will differ is in their ability to handle and dissipate heat > and, equally importantly, manage *disc rotor wear*. Bottom line, your > choice of brakepad type will be determined by your driving style. The > ceramics would be fine for most use and their manner of operation tends > to contribute to longer disc life. On the other hand, if you tow heavy > loads or are a bit of a tearaway and brake hard, low metallic or semi > metallic might work better for you. The downside will be that those pads > will wear the disc much more. Thanks for that additional information about the wear of the rotors which I hadn't thought about until you said it. The GG is only the friction but there are other things to consider but most of which we would never know. I really only wanted OE quality at decent prices. I think the GG must mean the braking is similar to a degree as you said, simply because the friction is the same between GG ceramic, NAO, and semi-metallic, but within a wide range of whatever the GG range allows. But that GG says nothing about anything else, as you said. I wish I could have found a lookup for the original pads friction rating. I was surprised that the parts supplier sent me a GG pad by the way. Does the rating go any higher than GG or is GG as high as it gets? |
#18
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2004 camry le 4 banger - how do I find the right front brake pads
Ohderii_Cruiser > wrote:
> >I really only wanted OE quality at decent prices. OE quality is pretty crappy. I don't think you can get pads as bad as OEM pads from any reputable suppliers. The manufacturer fits the car with the worst tires and brake pads they think they can get away with. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#19
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2004 camry le 4 banger - how do I find the right front brake pads
Scott Dorsey > suggested:\
>>I really only wanted OE quality at decent prices. > > OE quality is pretty crappy. I don't think you can get pads as bad as OEM > pads from any reputable suppliers. The manufacturer fits the car with the > worst tires and brake pads they think they can get away with. I don't disagree that OE might be crappy, but in most things safety related, nobody will put on WORSE replacement parts, than OE, right? However, these OE replacements are GG, which, in terms of cold & hot friction, is damn good, don't you think? Friction is job 1 for a brake pad & there isn't much better than GG. http://faculty.ccbcmd.edu/~smacadof/DOTPadCodes.htm I don't know though, what the OE friction codes are. |
#20
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2004 camry le 4 banger - how do I find the right front brakepads
On 11/14/2019 11:04 AM, Ohderii_Cruiser wrote:
> Xeno > suggested:\ >>> Thanks for explaining the chamfer is to reduce noise. >>> I had asked the internet supplier for pads meeting the OE >>> spec. >>> He gave me these Centric GG pads which are "ceramic". >>> Do you think a GG NAO or ceramic or semi-metallic would >>> brake the same? >> >> Probably not since they are different compounds. Since all >> might be GG rated, then the actual braking effect itself >> might match to a degree, where they will differ is in >> their ability to handle and dissipate heat and, equally >> importantly, manage *disc rotor wear*. Bottom line, your >> choice of brakepad type will be determined by your driving >> style. The ceramics would be fine for most use and their >> manner of operation tends to contribute to longer disc >> life. On the other hand, if you tow heavy loads or are a >> bit of a tearaway and brake hard, low metallic or semi >> metallic might work better for you. The downside will be >> that those pads will wear the disc much more. > > Thanks for that additional information about the wear of the > rotors which I > hadn't thought about until you said it. The GG is only the > friction but > there are other things to consider but most of which we > would never know. > > I really only wanted OE quality at decent prices. > > I think the GG must mean the braking is similar to a degree > as you said, > simply because the friction is the same between GG ceramic, > NAO, and > semi-metallic, but within a wide range of whatever the GG > range allows. > > But that GG says nothing about anything else, as you said. > I wish I could have found a lookup for the original pads > friction rating. > > I was surprised that the parts supplier sent me a GG pad by > the way. > Does the rating go any higher than GG or is GG as high as it > gets? http://faculty.ccbcmd.edu/~smacadof/DOTPadCodes.htm -- Andrew Muzi <www.yellowjersey.org/> Open every day since 1 April, 1971 |
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