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MarkGolf
Montreal


Joined: 13 Nov 2012
Posts: 565
Location: S.London


PostPosted: Sat Jul 28, 2018 7:53 pm    Post subject: Boxster vibration when braking - 986 Reply with quote

Hi all,

My wifes Boxster has a very bad vibration when braking at speed, I'm sure its there all of the time but under 30mph and normal braking, it is not so noticeable, anything fast and the car vibrates badly. You can feel it through the steering, brake pedal and bum.

The car drives perfectly, it can happily do 120 without vibration but as soon as you touch the brakes, the car feels unsafe and vibrates like crazy.

The brake discs and pads are brand new, literally brand new, they were fitted by a garage under the ownership of the previous owner, they're pagid pads with brembo discs. I have tried to do some high speed braking in order to bed them in, incase they weren't or if there was pad deposits on the discs but this had no positive outcome.

I can only think that a bush is worn somewhere or something now? I havent had a chance to poke around the front axle as yet, assuming its the front.

Any common issues with these cars and vibrations under braking?
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Delanor
Nürburgring


Joined: 01 Oct 2016
Posts: 428
Location: The land of the big cat!


PostPosted: Sun Jul 29, 2018 10:05 am    Post subject: Reply with quote

Your first step should be to check for any excess run out on each disc just because new discs etc have been fitted doesn`t mean to say its OK if the hub location isn`t perfectly clean it will be shown up in the disc with a DTI (Dial Test Indicator - clock gauge)

*
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Del.
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adamw
Estoril


Joined: 09 Jul 2009
Posts: 3790
Location: West Sussex

2002 Porsche 996 Turbo

PostPosted: Sun Jul 29, 2018 10:59 am    Post subject: Reply with quote

I seem to have the issue on mine 96T
I wouldn’t say the vibration is extreme but definately noticeable and annoying.
Disks are only 3k old, fitted June 17 and I’ve not done any trackwork or really hard driving either.
Had geo, balancing looked at but was advised all looks ok and likely warped discs from possibly being fitted to a hub that wasn’t 100% clear.
Not sure where I stand on this..?
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MarkGolf
Montreal


Joined: 13 Nov 2012
Posts: 565
Location: S.London


PostPosted: Thu Aug 02, 2018 12:04 pm    Post subject: Reply with quote

Cheers!

Its got an MOT soon and they've got a machine to check the discs so lets see!
_________________
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1994 Eunos Roadster S Special Turbo 270bhp!
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