GS - 2nd Gen (1998-2005) Discussion about the second generation GS300, GS400 and GS430 (1998 - 2005)

Shaking while braking problem

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Old 06-07-10, 02:58 PM
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Chris98GS4
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Default Shaking while braking problem

Hey guys. My car shakes when I apply the brake. Worse at high speeds. There is a loud pulsation and vibration.

I changed the front rotors, pads, upper control arm ,bushings.

Funny thing is, when its rainy and wet (after wash) it doesn't do it as much until its dry again.

Could it be the rear brakes? Tie rods?

Any help would be AWESOME!!!!
Thanks guys!
Old 06-07-10, 03:28 PM
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dejavu157
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did you lower your car or get new rims?
Old 06-07-10, 03:29 PM
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Chris98GS4
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Hmmm. I had it aligned too, but wasnt the greatest alignment.

It only shakes and vibrates VERY loud when I hit the brakes.

Maybe I will try to get it aligned again.
Old 06-07-10, 03:31 PM
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Chris98GS4
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Originally Posted by dejavu157
did you lower your car or get new rims?
No. Im gonna do those after I figure this prob out.
Old 06-07-10, 03:33 PM
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Chris98GS4
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What do you guys make of it that the shaking/vibration goes almost away when it gets wet?

Possibly the rear rotors? The noise seems to be coming from the front right.

Last edited by Chris98GS4; 06-07-10 at 03:38 PM.
Old 06-07-10, 05:09 PM
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FrankT
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You need to make sure the caliper guide pins are lubed and the caliper slides freely on those pins.

Good luck...
Old 06-07-10, 05:24 PM
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BCP43002
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If you feel the shakes in the steering wheel when you brake, it's the front. If you feel the shakes in your seat, it's the rear.
Old 06-07-10, 06:17 PM
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Chris98GS4
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Originally Posted by BCP43002
If you feel the shakes in the steering wheel when you brake, it's the front. If you feel the shakes in your seat, it's the rear.
Not really the steering wheel. More like the Pedal pounding and shaking in the front when I brake.
Old 06-07-10, 06:34 PM
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carbongs
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Originally Posted by FrankT
You need to make sure the caliper guide pins are lubed and the caliper slides freely on those pins.

Good luck...
Originally Posted by 98gs4hunny
Not really the steering wheel. More like the Pedal pounding and shaking in the front when I brake.
i had the same issue when i had stock brakes and it was a combination of the guide pins as well as the rotors. i think it may be the rotors. if you've ever slammed on the brakes at one point they may have warped or obtained uneven wear. so when you brake, especially under a large load or downhill the car will vibrate every time your caliper runs over that groove in the rotor. might be time to resurface them or replace them too?
Old 06-07-10, 06:37 PM
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Chris98GS4
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Originally Posted by carbongs
i had the same issue when i had stock brakes and it was a combination of the guide pins as well as the rotors. i think it may be the rotors. if you've ever slammed on the brakes at one point they may have warped or obtained uneven wear. so when you brake, especially under a large load or downhill the car will vibrate every time your caliper runs over that groove in the rotor. might be time to resurface them or replace them too?
I thought it was the rotors so I changed pads and rotors today.
Old 06-07-10, 06:40 PM
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carbongs
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Originally Posted by 98gs4hunny
I thought it was the rotors so I changed pads and rotors today.
and the outcome? also how long has it been since you checked your brake fluid? super dirty? leaking anywhere?
Old 06-07-10, 06:41 PM
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fenderzig
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Originally Posted by 98gs4hunny
I thought it was the rotors so I changed pads and rotors today.

Did that help?
Old 06-07-10, 06:45 PM
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Originally Posted by carbongs
and the outcome? also how long has it been since you checked your brake fluid? super dirty? leaking anywhere?
Same shaking. Fluid looked fine and no leaks.
Old 06-07-10, 06:46 PM
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carbongs
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Originally Posted by 98gs4hunny
Same shaking. Fluid looked fine and no leaks.
hmmmm, wow maybe time to bleed the brakes could be bubbles in the lines?
Old 06-07-10, 06:49 PM
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Originally Posted by carbongs
hmmmm, wow maybe time to bleed the brakes could be bubbles in the lines?
OK thanks man.

Do you think that would stop the violent vibration?

I thought this might be a calliper problem but I'm not sure.

I guess it has to be some kind of brake system problem right? It only
happens when I press the brake. Gets worse the faster I'm going and hit the brakes.


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