Voodoo_S2K

Orthonormal

When you say your stopping distance is worse, do you mean for the same pressure on the pedal? If you press harder, do you stop faster? Or are the tires sliding? Does the pedal go farther down for the same pressure?

From what you seem to be saying, the tires aren't sliding but you have to press harder on the pedal to get the car to stop in the same distance. The pedal doesn't go any farther down for the same pressure. If that's the case, either the pads or rotors have been contaminated, the pads got overheated and formed a layer of the wrong sort of material at the surface, or your pads just don't grip as much in colder weather. What pads are they?

S2k-Takara

[QUOTE=Orthonormal,Nov 30 2007, 01:31 PM] When you say your stopping distance is worse, do you mean for the same pressure on the pedal?

jerrypeterson

If you slam the pedal to the floor, will the ABS engage?

S2k-Takara

yes

Borbor

Disagreed.

Several tracks I know of greases up as the sun beats down on it.

glagola1

Your pads are glazed and yes, tires have less grip when they are cool.

Sure, tires can get greasy when super hot but I doubt that is happening at this time of year.

Orthonormal

Tires do lose grip when they get too cold. They also lose grip when they get too hot. Your observation doesn't disprove Jerry's statement.

Back to the original question: if you can engage the ABS when you press the pedal hard enough, then the pads aren't limiting your stopping distance. But it still sounds like you feel that the car isn't stopping fast enough for your usual pedal pressure. Is that the problem?

Or is it that even when you engage ABS the car isn't stopping quickly enough?

SPLNDID

Yeah, homey...
Bleed the brakes. Get at least two other peeps to help you out. Have one stay duty on the brake master cylinder fluid and keep it topped to ensure that your master cylinder never runs dry... If it does run dry, you'll have another whole procedure to make sure that there is no air in the line. Have another to birp the brakes at every corner. Stomp on the brakes before birping too!
I had a similar problem. It turned out to be a tiny bubble in my lines.
So, push new fluid out to each corner and start with your longest line. Wait for the fluid to change color to the new stuff and use good procedure to get all the bubbles out at each corner.
Also be sure to check your brake slider pins at the caliper. Make certain that they can move easily. If a pin is stuck it can cause unwanted wear and unwanted tracking to one side.
So, take your time and do it again.
Also, evaluate if your brakes are "slippery" all over, or just at one spot on the track. For example... there is one spot on my home track that has "wavey"... it causes my braking to skip over the humps. What I have to do is brake before the humps and/or move out of the way of the humps/waves.
Evaluate your tack. If it is not just one corner of the track, then evaluate your braking system.

Party on,
CB

CB

S2k-Takara

Yeah, feeling like abs over does its job.

I should mention about the winter/colder weather deal, this isn't what my S braked like last winter, or what my other S braked like in previous winters.


Also, I should mention that it is noticeably different enough that my wife noticed as well. (she is not a car guy )