I have an 11 evo x gsr. Ever since I bought the car brakes squeak when applied lightly, I brought it to the dealer twice and they tell me this is normal for Eva's .. Is this really normal...

 

Yes.

 

I found that if I applied a little more pedal pressure it would go away. I ended up buying aftermarket pads. I cut down on the dust and they only squeak when I haven't washed it in a week or two


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Rust ... the ultimate anti-squeak for racing brakes.

 

Get some Ferodo's, they still makes a little noise occasionally, but nothing like that 18 wheeler brake sound the Brembo's make.

 

spray some brake cleaner on them. it'll hold out for a few weeks till the dirt and grime come back or replace them with after markets

 

The stock pads on my EVO 8 would squeak and be a bit "grabby" when they were cold.
If I could get them up to temperature, they'd be fine.

After I moved to the DC area, my brakes would always go cold sitting at the mismanaged traffic lights.
So I put a set of Porterfield R4S pads on it. No more squeaking.
But the different compound does cause the ABS to kick in earlier, so the braking distances did increase a bit.

(Changing to new pads on a four pot Brembo is a little like those cartoons where you push in one drawer and another pops out. )

 

??? Would love to know more about this idea.

 

Maybe it's because I didn't turn the rotors before changing compounds, or maybe it's the different compound.

Just reporting experience.

The ABS cuts in noticeably earlier with the R4S, so the "panic stop" mode is still quick enough to close the sliding sun shade on the sunroof, but it doesn't stop like it hit a tree, anymore.

 

Well, pads play a role, of course, because the ABS is sensitive to wheel speeds and longitudinal g, but it's not a direct relationship between pads and ABS.

Getting into the details, the way that pads can affect things like balance and ABS is by having higher or lower CoFs than the OE pads. Higher CoF pads means that you do more of your braking at lower line pressures, where the front/rear bias is closer to even. Thus, the stickier pads could have, in effect, moved your bias too far rearward, such that the ABS is having to drop pressure to the rears earlier. In contrast, if the new pads have less bite, you need more pedal, putting you above the prop-value's split-point more often, which moves bias to the front.

Now, the S-ABS in an Evo X is pretty sophisticated (in that it is predictive ABS, not just reactive ABS), but messing with the bias will still have effects. If you can feel said effects, then that's a good sign, as it implies that you're very much "in tune" with your car.

edit: you are talking about an X, right? The ABS in an 8 is quite different.

 

No, this was on the EVO VIII (about two years back.) (And I changed pads on all four wheels at the same time.)

My X is scheduled to arrive in December.

I'm glad to hear the S-AWC is more "predictive". I was worried that switching from the A13Cs to all season tires would throw the system off.

 

Yes, you will love S-ABS over the old-school Bosch system in earlier Mitsus. It's so much less intrusive since it starts working before a tire locks up.

With that said, please keep an eye on what forum you're in, to avoid causing confusion. You have much less of a reason to disable the ABS in an X than any previous Evo. It's a brilliant system (for anything but dirt and gravel).

ps. "S-AWC" = S-ABS + ACD + AYC; "S-ABS" = sport ABS which is Mitsu's label for the new system that is predictive, rather than only reactive

 

Are the brakes mechanically that different on an X than on an VIII?
(One thing I liked about the VIII was that it stopped shorter than virtually anything else on the road.)

Do the X pads still squeal even when warmed up?

I forgot to mention: one reason there's less squealing with the R4S is that they produce a lot less brake dust than the factory (VIII) pads.
When I swapped rims twice a year on the VIII, I had to wash a boatload of brake dust off the rims coming off the car.

From what I've read, the stock X pads produce a lot of dust also.
That could be the source of some of the squealing.

 

I thought sport ABS was just the addition of the steering wheel angle to the ABS routines. So when it engages you can still turn without all four tires getting the same amount of brake force. It would vary the pressure to maintain the desired turn-in angle and (on the X) until stability control decides to intervene.

If it's truly predictive that would be great to hear. My understanding of the progression is as follows....

Evo 8: ABS uses wheelspeed and G sensors.
Evo 9: ABS also speaks with ACD and uses steering angle
Evo 10: ABS speaks with ACD, ASC, AYC, G sensors, steering angle

I also seem to find info that the Evo 8 had Sport ABS, but perhaps not in the USA? Originally I was thinking Evo 8 had ABS, Evo 9 Sport ABS, and Evo X just had more systems integrated with Sport ABS.

 

Not by much (and it's mostly the rear brakes that are weird on an X), but the electronics are quite different.

It is predictive. It uses the inputs you listed to predict lock-up (for each wheel separately, as it's a 4-channel system, not a 3-channel) and starts lowering pressure before lock-up occurs. It still reacts, as well, and shuts down at low speeds, as before, but the dropping of pressure before lock-up is the twist.

Also: I'm not which if any of the previous gens had Type-2 traction control and anti-skid. And no previous USDM Evo had assist for the AYC. Although none of this is ABS, per se.