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Old 12-29-2010, 02:07 PM   #1
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break issue

My car shakes when breaking at +60mph. its fine at slower speeds.

Anyone know what it could be?

thanks

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Old 12-29-2010, 03:36 PM   #2
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Breaking

What exactly is breaking? And, has it been broken before?
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Old 12-29-2010, 10:18 PM   #3
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braking not breaking.....

1st check tire pressure...if good
then
Check rotors for warpage due to overheating
If the rotors r brownish purple/blue in some parts of rotor..could
mean they were overheated during some aggressive braking
Best way to check rotor for warpage is to take it to a brake shop
and they'll put it on a lathe and spin it

Warped/cooked -->Replace both rotor and pads
my 2 cents
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Old 12-29-2010, 11:16 PM   #4
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Quote:
Originally Posted by bmimily
My car shakes when breaking at +60mph. its fine at slower speeds.
Anyone know what it could be?
It's probably "break" dancing, only works when the speed is high enough.

Last edited by Spinnaker; 12-29-2010 at 11:18 PM.
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Old 12-30-2010, 04:12 AM   #5
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It is very rare and almost impossible to warp a Porsche rotor.
What generally is called a warped rotor is brake pad deposits on the rotor face.
Every time the pads go over that patch it will grab a little more, causing the vibration.
This is common at the track, when rotors are extremely hot and people come to a complete stop and leave their foot on the brake pedal.
The patch just cooks for a second or two right to the rotor.
When at the track lift your foot off the brakes just before coming to a full stop and also don't engage the e-brake, leave the car in gear.
Happy Boxstering,
Pedro
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Old 12-30-2010, 06:17 AM   #6
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Agree with Pedro.

This link is pretty comprehensive:

http://www.stoptech.com/tech_info/wp_warped_brakedisk.shtml

You may be able to go out and perform 5-6 hard brake stops (80mph - 20mph) and clear off some of the deposits, just make sure you can drive around without coming to a complete stop before the pads cool down again.
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Old 12-30-2010, 06:30 AM   #7
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Agree with Pedro II.

Also someone posted a while back to this forum here:

Video: How to Bed-in Brake Pads and Rotors

with a link that moved to here:

http://www.essexparts.com/learning-center/cat/brake-pads/post/Bed-in

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