I just put stainless brake lines, new street/track cobalt pads, and super blue brake fluid in my MY02. I have a little bit of spongie-ness in the new brakes. We used the vacuum method to bleed the brakes so I think that there might be some air left in the lines. I am going to bleed them again tomorrow to see if it gets rid of it. But my big concern right now is that the brakes are squealing like a banshee. I

 

Did you perform a bed-in session yet? If so, how hard did you brake?

 

yeah, i did the brake-in thing. 40 to 10 at light to moderate braking for 10 runs. The funny thing is, now if i go from 80 to 0, moderate braking, i hear nothing. if I go from 30 to 10, moderate, i get the squeal

 

pads might be the reason as street/track pads tend to squeel a bit. have you ever heard some race cars? they are squeeling like crazy!!! but try some of that orange disk quiet stuff that might help.

 

No. That's likely causing the sponginess you feel. Vacuum bleeds are not a good way to bleed these brakes. Do a pressure bleed or the "good ol' pedal push" thing.

It's caused by this:
And this:
You should have used "anti-squeal" compound. "Anti-seize" is for sparkplugs.

And also what Harpoon said.

 

fair enough. can anyone suggest a good "street" pad that wont squeal, but if I head out to do a 2-day (novice, hehe) track event, I wont have to change my brakes between the days?

EDIT: my mistake, I meant anti-squeal. my mechanic knew what he was doing.

 

Once you get to about 30% on the cobalt sport GT's the squealing is greatly minimized.

That or my hearing has diminished.

 

Try the Carbotech pads. I went with the Panther + on the front and rear before a HPDE day. I glazed the rears. Carbotech recommends to run their more aggressive 10 pad on the front and 8 on the rears for such events for the S2000 with high performance tires, not including R compounds. You can keep them on for street use too, although you'll get some noise and a fair amount of brake dust. I'm going to sand down my pads and rotors to get rid of the glazing and then switch to the 10/8 combo once the Panther + pads wear out.

 

did u surfaced/grind the rotor?

 

spongy pedal = air in the system. Air compresses while liquids do not. Keep bleeding until the spongyness is gone. Air in the system is reducing available brake pressure. Even with an anti-squeal applied to the back of the pads and shims, expect some noise from the cobalts.