Got new pads.. GG in rear FF in front?

[sh40674]

Got some new brakes for my truck, besides 1 rotor looking like a return (thanks rock auto, at least doesn't look used) I just bought the cheapest front and rear kits for my 2011 f150... which is raybestos R line ceramic and rotors in the rear, wagner quick stop ceramic pads/rotors up front. The pictures on rock auto indicated both are FF pads. They showed up today and the rear raybestos are GG and the front wagner are FF

I honestly never paid attention to friction rating until very recently, that being said with GG being a higher rating in the rear is this going to cause any issues with a lower friction rating up front?

 

[Tman220]

From my experience if you're going to upgrade friction ratings you should make the same changes to both the front and rear brakes. If stock was FF front and rear I wouldn't put GG's in the rear and leave FF's up front, this will no doubt goof up the bias front and rear and may create issues with one axle wanting the lock up before the other under extreme braking.

With that being said, most people may not be able to tell the difference and with modern antilock brakes and some degree of active biasing it's probably not a huge deal

 

[slacktide_bitog]

It will not be a problem at all, and usually people buying the cheapest pads don't care and/or won't notice

 

[ripcord]

The specifications for the friction levels are rather abrupt. Your GG pads may have practically the same friction characteristics as the FF ones and unless you get their actual numbers (good luck) then you really can't say how different they may be. They could be closer to your front FF pads than a different brand of pads labeled FF.

Rating	Coefficient of Friction
E	.25 – .35
F	.35 – .45
G	.45 – .55
H	.55 – .65

Where I got this table:
https://idpartsblog.com/2019/04/11/what-do-brake-pad-friction-ratings-mean/

 

[eljefino]

It'll be great, help overcome the front bias most cars have. Make your braking more neutral.

 

[edyvw]

From my experience if you're going to upgrade friction ratings you should make the same changes to both the front and rear brakes. If stock was FF front and rear I wouldn't put GG's in the rear and leave FF's up front, this will no doubt goof up the bias front and rear and may create issues with one axle wanting the lock up before the other under extreme braking.

With that being said, most people may not be able to tell the difference and with modern antilock brakes and some degree of active biasing it's probably not a huge deal

That is not how it works.
I had GG pads that had absolutely horrible initial bite force, and I bet I have them now on Sequoia that I just purchased.
I also used extraordinarily aggressive track pads that were rated EE.
The key is the material pads are made from. If both are ceramic, I would say GG in front. If FF is semi-metallic, and GG ceramic, semi-metallic is absolutely in the front.

 

[930.engineering]

.
Don't worry, hardly an issue, if at all. I run FF rated pads on front
and GG pads on rear with my FWD Cooper (37 % weight on rear).

Post in thread 'Raybestos brake pads failed'

Nov 25, 2024

GG rated, not bad.

Many Ferodo pads (Premier Eco Friction) use to come with a GG rating.
"FER5100 GG" actually is a Ferodo made compound.
Don't overrate these ratings, often misleading and only one small part
of what actually matters. Some FF rated pads feel better than some GG
rated ones.
.

• 930.engineering

• 

.

 

[Tman220]

That is not how it works.
I had GG pads that had absolutely horrible initial bite force, and I bet I have them now on Sequoia that I just purchased.
I also used extraordinarily aggressive track pads that were rated EE.
The key is the material pads are made from. If both are ceramic, I would say GG in front. If FF is semi-metallic, and GG ceramic, semi-metallic is absolutely in the front.

The point was installing non compatible brake pads MAY be a problem. If you have pads the bite well when cold and combine them with pads that dont bite til hot like your race pads that's a problem isn't it?

 

[edyvw]

The point was installing non compatible brake pads MAY be a problem. If you have pads the bite well when cold and combine them with pads that dont bite til hot like your race pads that's a problem isn't it?

I am giving you an example.
Any Semimetallic FE, FF, FG, FH, GG, GH pad will bite far better than your typical ceramic pad GG, GH, when cold.
So it is all about material!
I have right now on BMW FF pads that will outperform in any conditions, cold or hot any ceramic GG pad.
On Tiguan, I have a similar setup that OP asked for. Front FG, rear GG. Front are semimetallic, rear are ceramic.
These guidelines are, at best, outdated and only used here in the US.