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  #1 (permalink)  
Old 08-21-2006, 08:26 AM
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Brake Fluid



After my track day last week my brakes have felt very underpowered. I am not getting anytwhere near the same stopping power.


I am judging this by how much further I am pressing the peddle down for heal-n-toe shifts. In fact, a lot of the time I can't do it now, because my foot on the brake is way past the throttle peddle.


At the track, I used the brakes very hard. I was told before I went that it was a very hard track on brakes. on one of my last laps, coming into a hairpin off a long straight, the peddle went all the way to the floor. I must have effected the brake fluid.


So what I ned to know is, is there a chance that I will have to replace the brake fluid now? Will that resolve the problem? Or do they just need bleeding? Or am I looking in the wrong place, and it could be something else?


Any advice would be greatly appreciated.


Jack





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Old 08-21-2006, 11:27 AM
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Jack,


Did you ever bleed or put in better fluid than what the factory ships? Almost everyone I know who has put in better brake fluid like super blue has found some air bubbles in their stock factory fluid from the factory. It sounds like you cooked the fluid and have air in the lines, especially if pumping the brakes helped. If pumping didn't help then you might have a leak somewhere or a problem with the brake master cylinder itself, but most likely air in the lines.
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Old 08-21-2006, 11:32 AM
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This information was given to me at a local PCA club meeting, I have no personal experience. They told me to change brake fluid after the first track event if it was original, and every other event if it was good quality aftermarket. The other thing they told me is to think replacing the brake hoses with SS braided ones to avoid a spongy feel at the track. As far as pedal travel you could have worn a reasonable amount of pad, check first your brake fluid reservoir. Bleeding brakes even in a newcar is not abad idea for track use.


The above advice is not my own, but I trust the people that gave it to me.
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Old 08-21-2006, 11:49 AM
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Ken, no I haven't ever changed, checked or bled the stock brake fluid. What do you run in your car?


Willr who is a regular tracker here in the UK has changed his fluid, and recommended I do so if I was going to track more frequently.


Another question, next to the brake pads there are cylindrical 'stoppers' top and bottom. Is it these that you use to judge pad wear? Or are they always a fixed distance from the rotor. I never really payed attention to them before.


If someone has a picture of a brand new V a worn out pad it would be appreciated.


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Old 08-21-2006, 12:08 PM
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I run superblue in my car and highly recommend you change our fluid and bleed out any air that might be in there. I need to pull my pads to inspect how much they are worn, visually looking at them in the rotor it looks like 1/4' left but the sensors are telling me they need replaced (even after cooling down) so I'm going to pull them for a closer inspection.
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Old 08-21-2006, 12:32 PM
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Is that 1/4' of material left to the backing plate? or 1/4' from these little cylindrical stops to the disc?


Also do you have an OEM part number for the pad? Are they the same as any 911 or Boxster pads?


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Old 08-21-2006, 12:51 PM
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Jack,


I was just checking into brake pads over the weekend. According to my PET cd the part numbers are:


P996 352 949 03 front


P986 352 939 10 rear


Also according to the CD, these are the same pads that a 2006 Boxster S use.


Dave

Edited by - DaveD on 08/21/2006 06:53:00 AM
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Old 08-21-2006, 01:24 PM
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Thanks Dave


What does PET stand for?


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Old 08-21-2006, 01:43 PM
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Also, what make are OEM Porsche Pads?


Thanks


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Old 08-21-2006, 01:58 PM
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Not sure what PET stands for. It is a CD that has exploded parts diagrams and part numbers for each model like they use at the dealer. It is labeled 'Genuine Parts Catalog'. A link toa free copy of the Cay-S file was posted here recently - after I'd already purchased the CD,of course. I think I ordered mine from suncoast. I assume they are available in your area as well. Mine is dated October '05, so they may be coming out with a new one soon.


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Old 08-21-2006, 02:06 PM
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Jack,

I've got about a 1/4' of pad showing between the rotor and the pad backing plate.


I think I am going to go with a set of Hawk pads, I need to find who has a good price on them. I've heard good things about running them on both street and track.
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