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Old 08-18-2010   #1
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What's your brake pads' friction rating?

After numerous discussions about brake performance and "initial bite", I'm curious as to the friction ratings found on the pads our fellow members are using. Are the OEM Pagid/Brembo "GG"/"HH" rated?

Please post the friction ratings you see in the "edge codes" printed on the, well, the back of the pads.

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Old 08-20-2010   #2
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Many thanks to Depiry about the OEM Pagid pads -- GG rated from the thread:
EBC Yellowstuff or Redstuff - any first hand experience.

(Lower friction pads, like FF ones, will stop the vehicle, but will also require more pedal effort. Some may like the less grabby nature of these pads. However, I don't think these will pass Euro R90 tests. )

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Old 08-21-2010   #3
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Some more generic info from EBC's website. They rated the Yellowstuff R1793 at 1000 deg F. That's way higher than the typical 600 deg F other pads are rated for "hot friction", so it may not be a good direct comparison with, for example, OEM Pagid/Brembo's GG rating.


EBC Yellowstuff R1793 cold mu=0.5=G, 1000degF =0.31=E (!)
(this is not the "upgraded high friction" Yellowstuff with less cold bite and life.)
EBC Redstuff nominal mu = 0.5=G (low dust, no steel fiber)
EBC Ultimax nominal mu = 0.45=G (low cost Euro-R90 OEM replacement)


The higher the number the stronger the friction (SAE J866a):
E = 0.25-0.35
F = 0.35-0.45
G = 0.45-0.55
H = 0.55-0.65
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Old 08-23-2010   #4
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You mean letter?
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Old 08-23-2010   #5
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Yes please. As in "Pagid xxxxx GG". I think that's called SAE J866a format?


Quote:
Originally Posted by nltomba View Post
You mean letter?
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Old 08-25-2010   #6
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Thanks to Nickm in message #87 of New brakes installed...NOT SO HAPPY!

The Raybestos rear pads have a friction rating of EE. That's mu=0.25-0.35 coefficient of friction.
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Old 08-25-2010   #7
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So does anyone know if E rated pads will take about 166% the pedal force to stop than (OEM) G rated pads, and that F rated pads will take about 125% over the OEM pads?

Maybe this helps to explain the weak pedal, lack of bite complaints?

If you used that much more pedal force for the same stop, what happens to reserve? And rubber hose swell?
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Old 08-25-2010   #8
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Many thanks to Jmpurcel for the link about the importance of using the correct friction rated pads on vehicles with ABS/ESC/EBD systems.

Brake Myths: ABS/ESC & Replacement Brake Pads

From his post (message #91, New brakes installed...NOT SO HAPPY! )
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Old 09-04-2010   #9
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Here is an article about the benefit of getting an E-marked, Euro ECE R90 approved brake pad:

Brake Pad Check - Upgrading Brake Pads - Eurotuner Magazine

According to the article, the approved pads should generally be SAE "G" friction rated or above.
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Old 09-05-2010   #10
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Hawk LTS - FF

The Hawk LTS pads I just put on today were marked FF on the back.

The OE Pagid / Brembos I took off were marked GF.

The LTS pads are not what I'd call fully bedded yet, since I can still see some machining marks on the Zimmermann rotors, but already feel about the same as the OE's to me. We'll see how they feel after a little while.

An annoyance: the OE rotors I took off were the most severely lipped I've ever seen (my basis for comparison is Subarus, US cars/trucks and various Korean/Japanese cars). I suppose this can be attributed to the abrasive OE pad compound. The lip, rather than the face of the rotor, actually cut the wear sensor. I think I could've had another 5k miles on these pads if not for that. Oh well, no harm in being conservative and replacing them early (except to my wallet). Here's hoping the LTS / Zimmermann combo lasts a little longer, without the lipping, and the perfrormance is good.

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