Croc

about 1,000 km ago i put new fron Centric premium rotors and Stoptech Street Performance Pads all aroung.

https://www.s2ki.com/forums/index.php?showtopic=818233

the system was bled with DOT4 about 4 months ago.

since i got a new setup and bedded it i face a little but nasty problem - usually braking and decelaration is OK but when i need to decelerate from say 100-80 km to a very slow speed (think hairpin or a tight 90 degr turn) i'm getting a lot of ABS.

i had it 3 times already and the road didn't look greasy or something.
the tires are 4,000km old Dunzlop Z1 still in very good conidtion.

i thought "those pads just sucks" but some people say that this is because pads heat a lot and at that point they brake too much for tires to grip.

which is strange for Z1's to do at those speeds and also i'm never getting this at hard brakings from 160km to 80 km.
i can hear tires squeal but not this crazy 2 seconds ABS.

what do you think?

VAD

Those are aggressive street pads according to StopTech. However, they shouldn't, imo, overwhelm your available traction from Z1's. If I were you, I'd email StopTech and see what they recommend.

Croc

i'll give it a try!!!
yesterday i was once again on a mountains snakerun and ABS worked a lot only once when i really came too fast on the very slippery surface.

so maybe those indeed were cases of slippery tarmac even though it didn't look like one.....

BrakeExpert

Not to critisize, but what size and width are your tires? What brand of DOT4 did you use, and how did you bleed them?

Orpheus

your brake bias front to rear may be off (oem is rear-biased under certain conditions). when you decelerate, weight trasfers forward, so your rear will be light. with good tires and heavy braking, this weight transfer is even greater. that's why track folks use different compounds front/rear, with the more aggressive in front. that way when the rear gets light it won't just start sliding. so, stoptech's street pads might be more aggressive than your oems, and with the heavier brakeing the rear is getting unloaded, worsening the already biased rear. anyway, just one theory.

Croc

this is interesting.........
but it never happend to me with stock pads.....
i took snakeruns mostly with a current tires and 1 or 2 times with old worn out ones.
didn't notice this whoth either tires ans stock pads/disks.

tires size are stock 17" - 215/245.
DOT4 is german made ATE.
bleeding was done in a usual way by a mechanig asking me to push brake pedal like 50 times........

what does it tell you?

BrakeExpert

I was wondering if air was introduced into the system. I bleed my brakes myself, but I use the trick of running the bleeder hose through the coilover, so you can open it and walk to the pedal (only fluid can get sucked back into the system because the bubbles go up, hooray for gravity). So i was considering if the car or ABS system might have had a bubble in it.

Orpheus

hey, that's a good tip!--i didn't even think of that.

BrakeExpert

Some ITR racer years ago told me. You run the bleeder hose through as high on the coilover as you can, and so you have like 6 inches at least of hose that points upward. Now you can bleed any car yourself