shaking under braking
Thread Starter
Burning Brakes
Joined: Sep 2001
Posts: 951
Likes: 1
From: Jacksonville Florida
shaking under braking
Car shakes badly under decelaration. My car does see some DE events, therefore, I concluded i must have warped the rotors. Well, I changed them out and have the same symptoms. I'm using stock pads.
any ideas?
any ideas?
Tech Contributor
Joined: Oct 1999
Posts: 41,036
Likes: 9,798
From: Charlotte, NC (formerly Endicott, NY)
When you participate in DEs do you change the wheels? The reason I ask this is a lot of so called warping issues are related to the wheels and rotors not being mounted correctly. If there is corrosion around the hub when you remove the wheel and re-install it the rotor may move some while you are taking the wheel off. When you re-install the wheel it may not force the rotor all the way down to the hub flange and the rotor will then have a lot of run out causing the problem you described. Sometimes just loosening the wheel and making sure it is seated correctly afainst the rotor and the rotor is flush against the hub flange before evenly bolting the wheel down will get rid of the problem.
Bill
Bill
Team Owner
Joined: Jul 2004
Posts: 24,652
Likes: 298
From: NJ
St. Jude Donor '05-'08
Originally Posted by BBQ
Car shakes badly under decelaration. My car does see some DE events, therefore, I concluded i must have warped the rotors. Well, I changed them out and have the same symptoms. I'm using stock pads.
any ideas?
any ideas?
did you install new pads at the same time you did the rotors?
Thread Starter
Burning Brakes
Joined: Sep 2001
Posts: 951
Likes: 1
From: Jacksonville Florida
i took additional care when I had the wheels off to make sure they are seated correctly and torqued to exactly 80lbs.
I did not replace the pads at the same time as the rotors.
I did not replace the pads at the same time as the rotors.
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Pro
Joined: Oct 2002
Posts: 586
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From: Idabel OK
Originally Posted by cyclerage23
Whats shaking? Streering wheel? brake pedal? feel it it in the floor of the car?
In my case I can feel it through the steering wheel but also all through the car and it does seem to be coming from the front. Mine has a slight vibration even under normal driving too though and I have had the tires rebalanced with no improvement.
Team Owner
Joined: Sep 2003
Posts: 43,084
Likes: 33
From: Raleigh / Rolesville NC
Originally Posted by BBQ
i took additional care when I had the wheels off to make sure they are seated correctly and torqued to exactly 80lbs.
I did not replace the pads at the same time as the rotors.
I did not replace the pads at the same time as the rotors.
Did you take those little washers off the studs??
Caliper mounting brakets to 125 lb fts.
Thread Starter
Burning Brakes
Joined: Sep 2001
Posts: 951
Likes: 1
From: Jacksonville Florida
Originally Posted by robvuk
Can you specifically feel it in the front? Or could it possibly be a rear brake issue? Otherwise I would guess wheel bearings too.
Thread Starter
Burning Brakes
Joined: Sep 2001
Posts: 951
Likes: 1
From: Jacksonville Florida
Originally Posted by AU N EGL
80 ?? the lug nuts are to be torqued to 100 ft lbs not 80.
Did you take those little washers off the studs??
Caliper mounting brakets to 125 lb fts.
Did you take those little washers off the studs??
Caliper mounting brakets to 125 lb fts.
Brake caliper is however at 125 lb ft.
Thread Starter
Burning Brakes
Joined: Sep 2001
Posts: 951
Likes: 1
From: Jacksonville Florida
Originally Posted by AU N EGL
80 ?? the lug nuts are to be torqued to 100 ft lbs not 80.
Did you take those little washers off the studs??
Caliper mounting brakets to 125 lb fts.
Did you take those little washers off the studs??
Caliper mounting brakets to 125 lb fts.
yes, i did take the washers off the studs, but I was having the problem before I did.
Melting Slicks
Joined: Aug 2002
Posts: 3,333
Likes: 1
From: Central NJ/PA
Originally Posted by BBQ
It seems to be from the front. In an effort to troubleshoot, i pulled the e-brake to active rear brakes and there was no problem. Therefore, I believe the problem to be in the front.
The back brakes dont work like that, but its a good effort. Is the shake constant, all the time nonstop or is it almost like a flatspot in your tire, it feels strong then weak, then strong then week, getting faster and louder as you go speed up?
Thread Starter
Burning Brakes
Joined: Sep 2001
Posts: 951
Likes: 1
From: Jacksonville Florida
Originally Posted by cyclerage23
The back brakes dont work like that, but its a good effort. Is the shake constant, all the time nonstop or is it almost like a flatspot in your tire, it feels strong then weak, then strong then week, getting faster and louder as you go speed up?
Team Owner
Joined: Jul 2006
Posts: 22,152
Likes: 4,165
From: Kannapolis NC
Originally Posted by cyclerage23
The back brakes dont work like that, but its a good effort. Is the shake constant, all the time nonstop or is it almost like a flatspot in your tire, it feels strong then weak, then strong then week, getting faster and louder as you go speed up?
Pulling on the parking brake doesn't engage the pads or rotor on the rear. It has its own shoes inside the hub of the rear rotors, so you could still have a warped rear rotor. But it still sounds like it might be bearing related if it's in the front. You might also have a glazed area on your front pads if you didn't change them when you changed the rotor. They might have overheated and aren't gripping the rotor evenly because of the glazing. Good luck.
Thread Starter
Burning Brakes
Joined: Sep 2001
Posts: 951
Likes: 1
From: Jacksonville Florida
Originally Posted by 65GGvert
Pulling on the parking brake doesn't engage the pads or rotor on the rear. It has its own shoes inside the hub of the rear rotors, so you could still have a warped rear rotor. But it still sounds like it might be bearing related if it's in the front. You might also have a glazed area on your front pads if you didn't change them when you changed the rotor. They might have overheated and aren't gripping the rotor evenly because of the glazing. Good luck.