Need a fix for Braking Unstability with road "Ruts" - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Mikamaro · 07-26-2011, 09:53 AM

Hi Guys,
I've been experiencing a lot of unstability from the back end of my SS while braking at high speeds on road surfaces.

The problem seems to come from the fact that the rear tires are larger then most of the Road "Ruts" and if you brake while changing lanes the back end will shake you like you're in a roller coaster!! Very dangerous....

So what are the solutions?
-Same size tires in Front?
-Reduce rear tire size to match front?
-Change Struts, suspension or other components?
but please don't tell me to drive slow...
Thanks
mike

PfadtRacing · 07-26-2011, 11:05 AM

Have you checked the simple things like tire pressures or alignment settings yet? Toe Out in the rear has a tendency to make high speed handling a little skittish. My feeling is that your issue may be mechanical.

Mikamaro · 07-26-2011, 11:22 AM

Quote:

Originally Posted by PfadtRacing

Have you checked the simple things like tire pressures or alignment settings yet? Toe Out in the rear has a tendency to make high speed handling a little skittish. My feeling is that your issue may be mechanical.

Alignment seems to be a bit off lately...and what tire pressure you suggest?
Plus I'm getting vibration only when braking...it's pulling right.
Perhaps I need to resurface the disk Brakes ?

PfadtRacing · 07-26-2011, 11:44 AM

Here is a basic diagram illustrating Camber/Caster/Toe pretty well. Toe out can cause the car to wander a bit as the tire wants to follow ruts in the road.

If you're getting vibrations and pulling under braking consistently it may be time to take the vehicle to the dealer and let them diagnose it. Could be time to service the braking system.

Mikamaro · 07-26-2011, 12:00 PM

Quote:

Originally Posted by PfadtRacing

Here is a basic diagram illustrating Camber/Caster/Toe pretty well. Toe out can cause the car to wander a bit as the tire wants to follow ruts in the road.

If you're getting vibrations and pulling under braking consistently it may be time to take the vehicle to the dealer and let them diagnose it. Could be time to service the braking system.

Wow! thanks great diagram...I'm booking a rendez-vous at the dealer now!
Alingment job ans a break systems check up!
I 'll let you know...

JDP Motorsports · 07-27-2011, 12:53 AM

I'd guess alignment myself.

axis · 07-27-2011, 04:18 AM

If you're vibrating under braking only, I'm thinking warped rotors. Of course it could be a number of things going on at once. Tire pressure should be 36psi cold, all around.

Mikamaro · 07-27-2011, 09:46 AM

Quote:

Originally Posted by axis

If you're vibrating under braking only, I'm thinking warped rotors. Of course it could be a number of things going on at once. Tire pressure should be 36psi cold, all around.

It's at the dealer this morning, it needed a 4 wheel alingment and resurfacing the rotors.
As far the tire pressure last year I ran them 36psi cold, this year 32 front and 34 back, it's a softer ride now. I might go back to 35 all around, but the road are so bad here that my suspension is taking a beating day in day out....what you think?

Mikamaro · 07-29-2011, 02:37 PM

They did the alingment but that didn't fix the problem. They could not resurface the rotors caus' the told me they were to much damage, they will replace all four Rotors with new ones but They are back order...ETA 10 days.

Avalnch · 07-29-2011, 07:02 PM

Quote:

Originally Posted by Mikamaro

They did the alingment but that didn't fix the problem. They could not resurface the rotors caus' the told me they were to much damage, they will replace all four Rotors with new ones but They are back order...ETA 10 days.

If they are telling you the rotors are "damaged" it probably means they are warped which would lead to your vibration during braking.

I see you're in Montreal, so you're probably experiencing -40 to +40°C changes ^_^

PAUL SS · 07-29-2011, 08:18 PM

Need a fix for Braking Unstability with road "Ruts"

Quote:

Originally Posted by Mikamaro

Hi Guys,
I've been experiencing a lot of unstability from the back end of my SS while braking at high speeds on road surfaces.The problem seems to come from the fact that the rear tires are larger then most of the Road "Ruts" and if you brake while changing lanes the back end will shake you like you're in a roller coaster!! Very dangerous....

So what are the solutions?
-Same size tires in Front?
-Reduce rear tire size to match front?
-Change Struts, suspension or other components?
but please don't tell me to drive slow...
Thanks
mike

Why are you traveling that fast on a road with ruts and braking hard? Hmmm

JusticePete · 07-30-2011, 08:42 PM

Quote:

Originally Posted by Mikamaro

They did the alingment but that didn't fix the problem. They could not resurface the rotors caus' the told me they were to much damage, they will replace all four Rotors with new ones but They are back order...ETA 10 days.

Please post your alignment specifications from the dealer.

Todd TCE · 07-30-2011, 10:43 PM

Just sounds like the ABS is cycling to me.

Mikamaro · 08-08-2011, 04:45 PM

Yes, My rotors are wraped they told me. (@ 20,000km / 12K miles)
No, I do not drive the SS in winter, (0 to +35 celcius / 32 to 90 F)

Quote:

Originally Posted by Avalnch

If they are telling you the rotors are "damaged" it probably means they are warped which would lead to your vibration during braking.

I see you're in Montreal, so you're probably experiencing -40 to +40°C changes ^_^

07-26-2011, 09:53 AM	#1
Mikamaro MikeNoMaro Drives: A 2016 Challenger R/T M6 STP Join Date: Sep 2009 Location: America Posts: 2,375 View My Garage	Need a fix for Braking Unstability with road "Ruts" Hi Guys, I've been experiencing a lot of unstability from the back end of my SS while braking at high speeds on road surfaces. The problem seems to come from the fact that the rear tires are larger then most of the Road "Ruts" and if you brake while changing lanes the back end will shake you like you're in a roller coaster!! Very dangerous.... So what are the solutions? -Same size tires in Front? -Reduce rear tire size to match front? -Change Struts, suspension or other components? but please don't tell me to drive slow... Thanks mike __________________ Track Day Videos: http://www.youtube.com/user/mrgoodman2000/videos Built #83817, Born January 18th, Christened June 11th 2010, Stolen October 3rd 2016.

07-27-2011, 04:18 AM	#7
axis Search Ninja Drives: 2010 Black 2SS/RS A6 Join Date: Oct 2009 Location: Central Ark Posts: 7,183	If you're vibrating under braking only, I'm thinking warped rotors. Of course it could be a number of things going on at once. Tire pressure should be 36psi cold, all around. __________________ 2010 Black 2SS/RS A6 Halltech CF 102 fed GPI modded intake manifold Bo (knows) White ported TB Kooks LT's/ Dynomax VT Pfadted (springs/sways) Dyno tuned by Rhino and GPI I once parallel parked a train.

07-29-2011, 02:37 PM	#9
Mikamaro MikeNoMaro Drives: A 2016 Challenger R/T M6 STP Join Date: Sep 2009 Location: America Posts: 2,375 View My Garage	They did the alingment but that didn't fix the problem. They could not resurface the rotors caus' the told me they were to much damage, they will replace all four Rotors with new ones but They are back order...ETA 10 days. __________________ Track Day Videos: http://www.youtube.com/user/mrgoodman2000/videos Built #83817, Born January 18th, Christened June 11th 2010, Stolen October 3rd 2016.

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07-26-2011, 11:05 AM	#2
PfadtRacing Drives: 2010 Camaro, 2006 Z06 Join Date: Feb 2009 Location: SLC, UT Posts: 3,370	Have you checked the simple things like tire pressures or alignment settings yet? Toe Out in the rear has a tendency to make high speed handling a little skittish. My feeling is that your issue may be mechanical.

07-26-2011, 11:44 AM	#4
PfadtRacing Drives: 2010 Camaro, 2006 Z06 Join Date: Feb 2009 Location: SLC, UT Posts: 3,370	Here is a basic diagram illustrating Camber/Caster/Toe pretty well. Toe out can cause the car to wander a bit as the tire wants to follow ruts in the road. If you're getting vibrations and pulling under braking consistently it may be time to take the vehicle to the dealer and let them diagnose it. Could be time to service the braking system.

07-27-2011, 12:53 AM	#6
JDP Motorsports Drives: 2011 Camaro SS/ 2016 Camaro SS Join Date: Jun 2009 Location: Sandy, Utah Posts: 3,256	I'd guess alignment myself.

07-30-2011, 10:43 PM	#13
Todd TCE Drives: Wells Coyote Join Date: Jul 2011 Location: tempe Posts: 77	Just sounds like the ABS is cycling to me.