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Old 01-21-2010, 04:39 PM
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Stock brakes performance

Anybody getting "wobbly" brakes when doing a hard brake at high speed?
When ever I do ha hard brake going around 130Mph my brakes and brake pedal starts to wobble. I don't know if it's the brakes or the ABS struggling. when braking at 70 - 100 I never feel it. So what do you guys think it could be?? Brakes or ABS?
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Old 01-21-2010, 04:46 PM
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Re: Stock brakes performance

130 mph?????????????? it sounds like your brakes are hot and makeing the disc warp a little.
p.s. you are crazy i dont take my jeep over 80mph
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Old 01-21-2010, 04:46 PM
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Re: Stock brakes performance

Have you considered a slightly worped (out of balance) rotor?
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Old 01-21-2010, 04:47 PM
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Re: Stock brakes performance

Ummm never done a hard brake from 130 mph but I would imagine that the heavy 5000 lb. suv has something to do with it.. that and the brakes probably aren't designed for such maneuvers.
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Old 01-21-2010, 04:47 PM
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Re: Stock brakes performance

never hit 130mph so not sure

sounds like either warped rotor or bad pads
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Old 01-21-2010, 04:47 PM
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Re: Stock brakes performance

No problems here . . .
I'd have the brake rotors checked. Could be warped. Also ABS would cause a pulsing in the pedal -- maybe that's what you're experiencing?
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Old 01-21-2010, 04:49 PM
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Re: Stock brakes performance

Damn I felt the abs for the first time yesterday.. glad I have it!
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Old 01-21-2010, 05:03 PM
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Re: Stock brakes performance

Ya, I can say that all my Jeeps have had warped rotors after about 20-25k. My last Jeep (commander) was so damn heavy that front brake problems seemed inevitable. I threw a set of Stillen Pillar Vanes on it and was really pleased with them. Although I traded it in for a WK about the time they were really broken in. I remember in my WJ, there was a recall on the rotors and I got them replaced for free. A nice bonus at the time... wish they'd recall these on my WK. I'm about to buy another set of rotors/pads and just replace them. I may just end up doing the Mopar kit for ~$170 for the fronts.
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Old 01-21-2010, 05:12 PM
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Re: Stock brakes performance

Mine has only done 8500 miles, so I don't wanna think that the rotors are warped just yet.
It's an instant wobble when applying brakes....not like the brakes first heat up and then wobbles.
And yeah Peter. Pulsing in the pedal is exactly what I'm feeling. That's why I think it could be the ABS, struggling with the sheer weight of the WK.

I'll have the rotors checked anyway just to be safe. And maybe change to SRT brembos(anyone done this?).

Thanks all for your replies!
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  #10  
Old 01-21-2010, 05:13 PM
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Re: Stock brakes performance

Quote:
Originally Posted by i0r15 View Post
Mine has only done 8500 miles, so I don't wanna think that the rotors are warped just yet.
It's an instant wobble when applying brakes....not like the brakes first heat up and then wobbles.
And yeah Peter. Pulsing in the pedal is exactly what I'm feeling. That's why I think it could be the ABS.

I'll have the rotors checked anyway just to be safe. And maybe change to SRT brembos(anyone done this?).

Thanks all for your replies!
Scottina06.. search his threads using the search feature... tons of info.
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Old 01-21-2010, 05:52 PM
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Re: Stock brakes performance

may I ask why you doing a hard brake while doing 130 mph? and why you going that fast anyways?
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Old 01-21-2010, 06:22 PM
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Re: Stock brakes performance

^^ LMAO....I'm not a speed freak. Simply streching the wk's legs a little. A hard brake test is something I try to do from time to time to ensure brakes are ok.

Ryan: Found it! Thanks bud!
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2009 Dark Charcoal 4.7 Limited WK(WH): K&N 63 Series Aircharger, Superchips 93 Tune, 8000k AAC CCFL Halo's(With relay), 6000k HID Fogs, 6000K HID Lows, Illuminated Mopar Jeep logo Sill guard, SRT Pedals. All around 5% window tint(Nobody see in, nobody see out). OEM Lamborghini Diablo Horn. Customcargrills perforated aluminum in lower valance(waiting to do the grille). 12" Pioneer Woofer on 1500w Boss Amp, Muffler Delete, Pirelli Scorpion Zero 255/60/17.
And more to come
Quote:
Jeremy Clarkson: “Speed has never killed anyone. Suddenly becoming stationary, that's what gets you.”

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