Bad vibration and pulsing when braking
12-23-2007, 12:23 PM
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Bad vibration and pulsing when braking 2000 z28. it was pulsing and has vibration badly through the brake pedal when brakes are applied. I was assuming it was warped front rotors and brakes, I changed all that with new rotors and brake pads.... the problem still exist....what do you think?
12-23-2007, 12:49 PM
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an alignment or possibly your tires, when was the last time you rotated/changed your tires? check your lug nuts(sounds newbish but check them) could be broken...are any of the brake lines being pinched?
12-23-2007, 01:08 PM
#5
Make sure your tires lug nuts are torqued down correctly, for the longest time I couldn't figure out why I had some vibration on my 3rd gen car under hard braking, but it turned out my torque wrench was way off the mark causing me to overtorque the lugnuts by quite a bit.
I'd also check if your brake caliper slide pins are properly lubed and that the pistons on the calipers moves easily in and out. If one of the pistons is on the verge of seizing, it would have a hard time releasing and possibly add an incredible amount of braking force to that piston alone causing uneven breaking. Last is check for any broken suspension parts in the front. If you notice that your car tends to nose dive a bit more on one side, that would affect the weight distribution on the tires while breaking.
Alignment issues usually slow up while attempting to drive straight as well as slowing down.
I'd also check if your brake caliper slide pins are properly lubed and that the pistons on the calipers moves easily in and out. If one of the pistons is on the verge of seizing, it would have a hard time releasing and possibly add an incredible amount of braking force to that piston alone causing uneven breaking. Last is check for any broken suspension parts in the front. If you notice that your car tends to nose dive a bit more on one side, that would affect the weight distribution on the tires while breaking.
Alignment issues usually slow up while attempting to drive straight as well as slowing down.
12-23-2007, 06:42 PM
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the lugnuts were inspected and appeared ok as bolted them back on yesterday...the car, had the same problem before putting new tires on and new weights. so far nothing has changed. the car feels solid .as far as alignment the car drives straight as an arrow....
i didnt observe any lines pinched. it feels as if the brake pedal is fighting back at me... for the longest time i thought it was a warped rotor......... i have no clue...
i didnt observe any lines pinched. it feels as if the brake pedal is fighting back at me... for the longest time i thought it was a warped rotor......... i have no clue...
Last edited by venom346; 12-23-2007 at 10:06 PM.
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12-24-2007, 02:19 PM
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new front rotors causing the same sensation as the old ones? the reason for the new rotors i just installed was because i thought the old ones which were drilled and slotted were warped.. the new rotors are oem and as i went for a test drive after the install, nothing had changed even with new front pads and rotors..........
As for the rear rotors.... i havent inspected or changed those yet... hmm..
As for the rear rotors.... i havent inspected or changed those yet... hmm..
12-24-2007, 08:11 PM
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new front rotors causing the same sensation as the old ones? the reason for the new rotors i just installed was because i thought the old ones which were drilled and slotted were warped.. the new rotors are oem and as i went for a test drive after the install, nothing had changed even with new front pads and rotors..........
As for the rear rotors.... i havent inspected or changed those yet... hmm..
As for the rear rotors.... i havent inspected or changed those yet... hmm..
12-28-2007, 03:44 AM
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i dont know much about ls1's but i know on older brake systems there is a proportional valve? that plays a vital role in appying equal brake pressure to all wheel cylinders?
12-06-2008, 10:40 AM
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Have the exact same issue. I replaced the brake rotors and pads, put on some different tires and wheels and still have the exact same issue. When I am coming to a low speed stop...especially going down hill, with light brake pedal pressure...the car will surge as the brakes grab and release (pulse). It is a little different feeling then warped rotors now that I think about it compared to everytime I warped the rotors on my vette.....but it was my first attempt to fix.....now what no brake error messages. But I suspect it has something to do with the brake unit...anybody try bleeding.
