Spun into Mud: Now Vibration in RR & Pulsating Brake
07-22-2009, 09:39 AM
#1
Terminal Vette Addict
Thread Starter
Spun into Mud: Now Vibration in RR & Pulsating Brake
Ok, spun out into the psgr side of the car.
Right rear I think I now detect a small vibration once I hit 80, for all i know lost a weight... havent had time to check yet. Will also check wheel balance.
The right rear pfadt coil is a bit slack and is clicking, i need to tighten the preload.. knew before session.
Can It just be a worse preload issue causing it to wobble assuming the rim/balance is ok?
Also I think my ActHand/ABS came on in future laps a bit earlier and more agressively in the later sessions. I was definitely driving the car harder as the day went on... but once or twice I really went Hmmm that wasnt worth helping me yet...
Could that be a hub/bearing/sensor needing replacing?
Is there a chance that I could have even bent a rear shaft leading to a hub to cause this? What are the signs of the shaft? THose suckers are pretty hard to gnarl up arent they? Way more than an easy mud slide right?
The pulsing brake shows ueven rotor contact going on in the firepath of the rotor, you can clearly see a outter vs. inner contact friction difference now.
Argh. All this and 2 cracked front rotors in 4 sessions.
Right rear I think I now detect a small vibration once I hit 80, for all i know lost a weight... havent had time to check yet. Will also check wheel balance.
The right rear pfadt coil is a bit slack and is clicking, i need to tighten the preload.. knew before session.
Can It just be a worse preload issue causing it to wobble assuming the rim/balance is ok?
Also I think my ActHand/ABS came on in future laps a bit earlier and more agressively in the later sessions. I was definitely driving the car harder as the day went on... but once or twice I really went Hmmm that wasnt worth helping me yet...
Could that be a hub/bearing/sensor needing replacing?
Is there a chance that I could have even bent a rear shaft leading to a hub to cause this? What are the signs of the shaft? THose suckers are pretty hard to gnarl up arent they? Way more than an easy mud slide right?
The pulsing brake shows ueven rotor contact going on in the firepath of the rotor, you can clearly see a outter vs. inner contact friction difference now.
Argh. All this and 2 cracked front rotors in 4 sessions.
07-22-2009, 11:09 AM
#2
Team Owner
Member Since: Mar 2001
Location: Boston, Dallas, Detroit, SoCal, back to Boston MA
Posts: 30,594
Received 237 Likes
on
165 Posts
probably just packed some mud in someplace
been there done that!
check that 1st.
did you replace the cracked rotors?
missing chunks would explain that too.
been there done that!
check that 1st.
did you replace the cracked rotors?
missing chunks would explain that too.
07-22-2009, 12:53 PM
#4
Instructor
Member Since: Apr 2009
Location: Mechanicsburg PA
Posts: 155
Likes: 0
Received 0 Likes
on
0 Posts
07-22-2009, 02:13 PM
#7
Race Director
If you stayed on the track you wouldn't have this problem.
I would jack up the back side of the car and check to see that all of the your suspension hardware is tight.
Also check to see wheel bearings are tight by grabbing the outside of tire and see if you detect any rocking or loseness.
Also check tires, you might try swaping the left and rear tire to see if that fixes the problem.
At what spped do you feel pulsations ??
