[GT-ER]

I do a lot of highway pulls of maybe 40-150 or 60-140, stuff like that. What I've noticed however is that no matter which pad I use (OEM, PowerStop, EBC Yellows), they feel inadequate at those speeds. I can stomp on the brake pedal and the car doesn't feel like it's even close to locking the front tires (not that I want to, but I want it to feel like it's at least capable of doing it).

Anyone have this issue? What have you done about it? Fluid, Brake Lines, other pads?

My braking feels amazing at lower speeds, but up on top it just feels spongy and lacking.

[viurniel]

Brake fluid makes a big difference at those speeds - if you are doing the pulls continuously. You can also upgrade the lines to remove some of the soft pedal feel. There is someone here selling carbon lines, or you can get stainless for a lower cost.

[Can'tHave2MuchHP]

Initial bite and follow through feel great for me when braking from high speeds like that. Perhaps a bleed or fluid change is in order. Upgraded lines as noted above will help.

[philpacs]

Interesting I posted observations from the track recently and mentioned this. Coming into turn 17 at Sebring close to 150mph and threshold braking is scary at first since the car doesn't seem to want to stop well then slows progressively more as the speed drop, it's not linear. They were new OEM pads put on a few days before so by the end of the day they seemed better so they needed to bed in more, multiple hot laps. On the street now they feel much better and I did a higher speed pull today and they stopped well albeit with a little chatter, maybe some deposits. So I would add make sure you bed them well.

[PROMETHEUS]

DOT 4 Brake Fluid, Castrol SRF, Brembo 64, etc, etc and maybe upgraded brake lines. Have done a considerable amount of track time with mine and have never let me down. OEM pads are amazingly good on the track. Obviously track pads would be even better, but I am fine with the OEMs.

[Snakebt6]

Mine stops like a monster..its really impressive..Ive got Castrol SRF.

I went with the SRF as I track the car and after having some brake fade with the stock fluid I switched.

Cant say I noticed a whole lot of difference in the pedal and feel after the switch.

Either way ive always been impressed with the stock brakes.

[GT-ER]

The rotor has a bluish hue after the last hard braking which I'm assuming is pad transfer, which is good correct? The car brakes better when it's like this but the rotors turn silver again after a couple of days of regular driving which I'm assuming is because the friction removes the pads material that was transfered. With that being said though, do I just have to keep breaking in the pads every couple of weeks?

I may swap lines and fluid to see what happens, philpacs' description is what made me think about pad material transferring and if maybe I just need to do the pad brake in procedure more often.

[kramard]

Originally Posted by GT-ER

The rotor has a bluish hue after the last hard braking which I'm assuming is pad transfer, which is good correct? The car brakes better when it's like this but the rotors turn silver again after a couple of days of regular driving which I'm assuming is because the friction removes the pads material that was transfered. With that being said though, do I just have to keep breaking in the pads every couple of weeks?

I may swap lines and fluid to see what happens, philpacs' description is what made me think about pad material transferring and if maybe I just need to do the pad brake in procedure more often.

Are you collecting data? Before changing anything really make sure you know why youre changing components. I’m braking from 161 to 50 at vir on stock pads with no issues. Your issue is probably related to heat. Upgrading fluid, pads, rotors etc really won’t (I believe) help you much because all your components are cold. Race pads will only need more heat to work. Tires also need heat to really slow the car down.

My high speed gps logs a deceleration or 1.4g above 120mph, 1.2g to 100mph, and 1.1g below 100. To do that I need warm tires and pads. My zle is fully stock (stock pads, fluid and rotors) and after 7 track days I’ve finally had to fully flush the stock fluid.

[GT-ER]

Originally Posted by kramard

Are you collecting data? Before changing anything really make sure you know why youre changing components. I’m braking from 161 to 50 at vir on stock pads with no issues. Your issue is probably related to heat. Upgrading fluid, pads, rotors etc really won’t (I believe) help you much because all your components are cold. Race pads will only need more heat to work. Tires also need heat to really slow the car down.

My high speed gps logs a deceleration or 1.4g above 120mph, 1.2g to 100mph, and 1.1g below 100. To do that I need warm tires and pads. My zle is fully stock (stock pads, fluid and rotors) and after 7 track days I’ve finally had to fully flush the stock fluid.

So now that you say that, you make a good point that my brakes are mostly cool when I do the hard braking, and then they are hot as hell (obviously). Is there maybe a pad or something that is better suited for those kinds of hard stops?

I don't have any way of collecting data, and the only parts I've changed were because on insane dusting on stock pad, and then no braking on the powerstops. The EBC's seem to be in the middle dust wise with stock pad bite.

So, looking at it that way, what could make my car brake better with cool brakes? The tires aren't an issue because they don't ever lock up (or activate abs). Could there be a better low temp pad?

[kramard]

Originally Posted by GT-ER

So now that you say that, you make a good point that my brakes are mostly cool when I do the hard braking, and then they are hot as hell (obviously). Is there maybe a pad or something that is better suited for those kinds of hard stops?

I don't have any way of collecting data, and the only parts I've changed were because on insane dusting on stock pad, and then no braking on the powerstops. The EBC's seem to be in the middle dust wise with stock pad bite.

So, looking at it that way, what could make my car brake better with cool brakes? The tires aren't an issue because they don't ever lock up (or activate abs). Could there be a better low temp pad?

They squeal really bad but maybe see if you can fit an hp+? They’re a low temp pad. You could also preheat the brakes before you pull? Might be hard to do if you’re doing random pulls. St43 might be another pad to consider but don’t know if it’ll fit.

For data grab an xps160 gps and buy the race chrono pro app. You can log your deceleration Gs and see how much g you’re pulling.

[ZLCHAPO]

I've noticed that when I get on the brakes fairly hard after doing a pull my traction control light comes on, not my ABS. What could cause that?

[17CamaroZL1]

Originally Posted by ZLCHAPO

I've noticed that when I get on the brakes fairly hard after doing a pull my traction control light comes on, not my ABS. What could cause that?

I'm pretty sure that light comes on for either traction control or stability control. If the ABS light comes on, you have a problem.

[Russell James]

Originally Posted by GT-ER

So now that you say that, you make a good point that my brakes are mostly cool when I do the hard braking, and then they are hot as hell (obviously). Is there maybe a pad or something that is better suited for those kinds of hard stops?

I don't have any way of collecting data, and the only parts I've changed were because on insane dusting on stock pad, and then no braking on the powerstops. The EBC's seem to be in the middle dust wise with stock pad bite.

So, looking at it that way, what could make my car brake better with cool brakes? The tires aren't an issue because they don't ever lock up (or activate abs). Could there be a better low temp pad?

I'd go back to the stock pads, upgrade fluid and hoses. Do the complete bedding procedure. Be OK with the dust, it means you have performance brakes that are working properly.

Low dust ceramics are for show cars, just my opinion.

150 mph+ capable brakes will produce massive brake dust. ZL1s I've driven that were properly bed in OE pads and good Dot 4have great warm or cool braking.

[GT-ER]

Originally Posted by Russell James

I'd go back to the stock pads, upgrade fluid and hoses. Do the complete bedding procedure. Be OK with the dust, it means you have performance brakes that are working properly.

Low dust ceramics are for show cars, just my opinion.

150 mph+ capable brakes will produce massive brake dust. ZL1s I've driven that were properly bed in OE pads and good Dot 4have great warm or cool braking.

I don't run ceramic pads right now, and the oem ones stopped identical to the ones I have now with more dust than the ones I have now.

I'm on a business trip right now so I have to wait till I get back to test some more.