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The Tire Rack's Tire & Wheel Forum
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Old 07-16-2004, 04:09 AM   #1
jackal7
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Concern about vibration while braking...

I just recently completed an install of H&R Cupkit with 18in wheels setup. It has been about three weeks and I'm ready to perform an alignment. My first question, is three weeks enough time to let the suspension components settle? Also, my main concern is, I noticed that the car starts vibrating only when braking and reducing from high to medium speeds (i.e. between 60mhp and 80mph), once I get in the low 30mhp the vibration starts to dissapears. I just want to know what might cause that behaviour and if it will go away after I perform the alignment.


Thanks in advance.
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Old 07-16-2004, 09:54 AM   #2
Gary@Tirerack
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Quote:
Originally Posted by jackal7
I just recently completed an install of H&R Cupkit with 18in wheels setup. It has been about three weeks and I'm ready to perform an alignment. My first question, is three weeks enough time to let the suspension components settle? Also, my main concern is, I noticed that the car starts vibrating only when braking and reducing from high to medium speeds (i.e. between 60mhp and 80mph), once I get in the low 30mhp the vibration starts to dissapears. I just want to know what might cause that behaviour and if it will go away after I perform the alignment.


Thanks in advance.
Have you ruled out that its a brake problem? Seems odd that it would only vibrate upon braking.
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Old 07-16-2004, 11:08 AM   #3
kyle808
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Quote:
Originally Posted by jackal7
I just recently completed an install of H&R Cupkit with 18in wheels setup. It has been about three weeks and I'm ready to perform an alignment. My first question, is three weeks enough time to let the suspension components settle? Also, my main concern is, I noticed that the car starts vibrating only when braking and reducing from high to medium speeds (i.e. between 60mhp and 80mph), once I get in the low 30mhp the vibration starts to dissapears. I just want to know what might cause that behaviour and if it will go away after I perform the alignment.


Thanks in advance.
I had the exact same symptoms before. Your front rotors are probably warped. The problem disappear after I replaced the rotors.
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Old 07-20-2004, 11:13 AM   #4
jackal7
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Gary...guess what?

Well,

Gary and Kyle, you guys were right. We isolated the problem to the front break discs being warped. What in the hell would cause that...? The car only has 4k miles on them and about 400 miles on the new suspension and wheels. By the way Gary, I just placed an order for rotors and pads at tirerack and dropped your name as a reference, order number 8190624. Can you expedite the order...lol This crap is killing me!
Being military overseas makes things a little difficult when trying to care for your baby, some of the prices for parts here in the UK are astronomical and with shipping and convenience factors in cosideration, it limit your sources to get good parts at decent prices. I only hope that it doesn't worsen while I wait for the parts. I guess minimal driving is in order.
Thanks for your input.

Rick
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Old 07-20-2004, 11:17 AM   #5
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The order is already completed processing, open to the warehouse and will ship with our next batch of Parcel Post APO orders
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Old 07-20-2004, 11:59 AM   #6
jackal7
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Thanks Gary

Once again, you never fail to amaze me with your customer support.

Endless Thanks
Rick
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Old 07-22-2004, 12:52 AM   #7
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Rotors can really easily get warped when they are hot after a long hard day of breaking and you go into a car wash and get that icy cold water splashed on your 300degree+ rotors. Do you frequently wash your car after driving or wait for your rotors to cooL??
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