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-   -   Brake Fluid (http://986forum.com/forums/showthread.php?t=14362)

dcompress 11-26-2007 10:36 AM

Brake Fluid
 
Going to order a Motive power bleeder. Is one liter of brake fluid enough to do a full flush, or do I need two?

timothy 11-26-2007 10:41 AM

I used a full two liters and that includes flushing the clutch at the same time.

dcompress 11-26-2007 12:02 PM

Mine is an auto, so no clutch, but it sounds like I should get 2 just in case. Don't mind the extra $$, but with alternating colors, it will be a while before I need blue again!

ChrisZang 11-26-2007 02:01 PM

i needed about 1.25 liters when I flushed my brakes the last time w/o flushing the clutch

racer_d 11-26-2007 02:24 PM

Also depends how bad/old the fluid is. When I flushed mine I was getting "crud" out of a rear caliper which necessitated more flushing than normal. Buy 2 and have enough rather than buying 1 and coming up short.

Tool Pants 11-26-2007 03:23 PM

The system hold less than .5 of a liter.

On our work on cars days I usually use 2/3rds of a liter, which includes the clutch.

brp987 11-26-2007 05:03 PM

According to the Bentley manual, if you have PSM then the PST2 is needed to bleed the brakes. In other words, not a DIY job.

FTD 11-27-2007 06:44 AM

Quote:

Originally Posted by brp987
According to the Bentley manual, if you have PSM then the PST2 is needed to bleed the brakes. In other words, not a DIY job.

Would you mind explaining PST2 and why this is not a DIY job?

timothy 11-27-2007 09:29 AM

Quote:

Originally Posted by Tool Pants
On our work on cars days I usually use 2/3rds of a liter, which includes the clutch.

That's because you're a pro by now. We newbies need the full two cans :)

Tool Pants 11-27-2007 10:35 AM

Well, I did figure out a way to bleed a caliper twice as fast....

brp987 11-27-2007 06:46 PM

Quote:

Originally Posted by FTD
Would you mind explaining PST2 and why this is not a DIY job?

From Bentley: "Brake bleeding on vehicles with ABS/TC 5.3 and PSM requires the Porsche System Tester 2 (PST 2) to activate the valves in the hydraulic unit for proper bleeding."

I believe the PST 2 is software/hardware. I've never seen it for sale, but have heard it's in the thousands of $.

DaveE 11-28-2007 03:52 AM

Quote:

Originally Posted by Tool Pants
Well, I did figure out a way to bleed a caliper twice as fast....

Ha Ha!! That's an awesome set-up! :)

JoshMD 11-28-2007 05:25 AM

What's the best brake fluid to use? ATE Blue?

FTD 11-28-2007 11:09 AM

Quote:

Originally Posted by brp987
From Bentley: "Brake bleeding on vehicles with ABS/TC 5.3 and PSM requires the Porsche System Tester 2 (PST 2) to activate the valves in the hydraulic unit for proper bleeding."

I believe the PST 2 is software/hardware. I've never seen it for sale, but have heard it's in the thousands of $.

Thank you. I will investigate. I had hoped to do it myself. :(

Adam 11-28-2007 11:17 AM

Quote:

Originally Posted by JoshMD
What's the best brake fluid to use? ATE Blue?

ATE blue is what I used and I'm very happy. I think they also offer an ATE gold so that way you can alternate colors. This way you know when the old stuff is flushed out.

Tool Pants 11-29-2007 07:58 AM

For a normal brake fluid change you do not need a PST2 if you have traction control or PSM. You do need it however if you are changing the fluid because those components have been replaced.

The manuals also say you need to hold down the clutch pedal when bleeding the clutch. You don't need to do this unless you have just replaced the master cylinder.

bmussatti 11-29-2007 08:32 AM

Quote:

Originally Posted by Tool Pants
For a normal brake fluid change you do not need a PST2 if you have traction control or PSM. You do need it however if you are changing the fluid because those components have been replaced.

The manuals also say you need to hold down the clutch pedal when bleeding the clutch. You don't need to do this unless you have just replaced the master cylinder.

Tool Pants, does this hold true for the 987 too? I thought you needed the PST2 for the 987 Boxster.

Tool Pants 11-29-2007 08:44 AM

PIWIS is the replacement for the PST2 and is needed for the 2005 up cars.

I am not up on the 987/997. I did speak to Peter once about bleeding the brakes on the newer cars and he said he did use the PIWIS. I do not remember the details as it will be a while before the newer cars show up at our work on cars days. Peter said it was a 997 but it might have had PASM or something like that.

JFERR 11-29-2007 09:00 AM

Quote:

Originally Posted by timothy
I used a full two liters and that includes flushing the clutch at the same time.

How do you do the clutch. Is there a DIY with pictures?

Thanks

EE3racing 11-29-2007 09:24 AM

Quote:

Originally Posted by Tool Pants
For a normal brake fluid change you do not need a PST2 if you have traction control or PSM. You do need it however if you are changing the fluid because those components have been replaced.

The manuals also say you need to hold down the clutch pedal when bleeding the clutch. You don't need to do this unless you have just replaced the master cylinder.


Can you elaborate on how you do bleed the clutch then TP? I am doing this soon and need all assistence.

bmussatti 11-29-2007 10:00 AM

Quote:

Originally Posted by xusmnimij
Can you elaborate on how you do bleed the clutch then TP? I am doing this soon and need all assistence.

Tony, a little OT here, but on the 987 the brake fluid and the clutch fluid are a shared system, so both get done at the same time. Not sure about the 986 Boxster.

I just had mine done last month. The dealership charged about $150.

FTD 11-29-2007 10:06 AM

Quote:

Originally Posted by Tool Pants
For a normal brake fluid change you do not need a PST2 if you have traction control or PSM. You do need it however if you are changing the fluid because those components have been replaced.
.

I did my research on this particular relationship and found similar statements. Unless one is also replacing master cylinder or other major component thank you for your confirmation. I am back to saving $150.00!

:cheers:

timothy 11-29-2007 10:10 AM

Quote:

Originally Posted by bmussatti
Tony, a little OT here, but on the 987 the brake fluid and the clutch fluid are a shared system, so both get done at the same time. Not sure about the 986 Boxster.

Same on a 986. The clutch bleed valve can be difficult to locate the first time ... blinkwatt posted a very helpful photo.

http://986forum.com/forums/showpost.php?p=96781&postcount=14

bmussatti 11-29-2007 10:18 AM

Quote:

Originally Posted by FTD
I did my research on this particular relationship and found similar statements. Unless one is also replacing master cylinder or other major component thank you for your confirmation. I am back to saving $150.00!

:cheers:

FTD, of course you will save $150 minus the true value of your time, therefore somewhat significantly less than $150! :) Satisfaction for sure. I understand that.

I only say this because people usually forget the value of their time when doing DIY projects.

EE3racing 11-29-2007 10:25 AM

Thanks guys, I'm aware of the shared system, I was specifically asking this: If you don't hold the clutch pedal down during bleed, what do you do? Is it pumped till one is sure new fluid exits the clutch bleeder? I have a saved pic of where it is, when I'm done with the styling mods currently underway, I'll be purchasing a motive and working on the brakes & clutch.

blinkwatt 11-29-2007 10:34 AM

Quote:

Originally Posted by bmussatti
I only say this because people usually forget the value of their time when doing DIY projects.

I can't agree with that more! :cheers:

Tool Pants 12-01-2007 08:04 AM

With a motive you do not need to hold the clutch pedal down. The air pressure from the motive will force the fluid through the clutch circuit and out the bleed nipple on the slave cylinder.

EE3racing 12-01-2007 10:18 AM

Quote:

Originally Posted by Tool Pants
With a motive you do not need to hold the clutch pedal down. The air pressure from the motive will force the fluid through the clutch circuit and out the bleed nipple on the slave cylinder.


Thanks Tool Pants, is there any negatives to replacing my brake lines with stainless braided? When I do, can I clamp off the old ones and totally remove the calipers for painting?

FTD 12-03-2007 06:08 AM

Quote:

Originally Posted by bmussatti
FTD, of course you will save $150 minus the true value of your time, therefore somewhat significantly less than $150! :) Satisfaction for sure. I understand that.

I only say this because people usually forget the value of their time when doing DIY projects.


A very good and important point. Thanks!!

My time is worth money. A frequent consideration in all things - home maintenance, car maintenance, you name it. Some things are fun, some things are a chore, and some things are just out of my league. I think a brake flush is an OK chore, especially with a helping hand to speed things along. Replacing clutch parts is misery and worth paying someone else. :)


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