Go Back   986 Forum - for Porsche Boxster & Cayman Owners > Porsche Boxster & Cayman Forums > Performance and Technical chat

Reply
 
LinkBack Thread Tools Display Modes
Old 10-06-2012, 01:47 PM   #1
Registered User
 
The Radium King's Avatar
 
Join Date: Apr 2010
Location: Canada
Posts: 2,887
brake fluid flush

got a question. if i bleed my brakes approx 5 times per year and run 500 mL of RBF600 through each time, you think there is any need for an annual flush?
The Radium King is offline   Reply With Quote
Old 10-06-2012, 08:25 PM   #2
Certified Boxster Addict
 
Join Date: Nov 2010
Location: Los Angeles
Posts: 7,426
The typical brake flush uses ~2 liters of brake fluid. Since you're replacing 1/2 liter x 5 times per year (~2.5 liters), you are more than flushing the whole system over the course of a year and can probably skip the yearly flush.
__________________
1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
thstone is offline   Reply With Quote
Old 10-07-2012, 04:45 AM   #3
Registered User
 
Join Date: Nov 2009
Location: Winnipeg MB
Posts: 2,486
Why do you bleed your brakes so frequently? Not saying you shouldn't, or being critical in any way, just curious.
__________________
'99 black 986
Mark_T is offline   Reply With Quote
Old 10-07-2012, 05:43 AM   #4
Homeboy981
 
Homeboy981's Avatar
 
Join Date: Jan 2012
Location: Sherman, TX
Posts: 663
Garage
Track Days. You do a lot of track days, right?
Jealous!
__________________
2002 Porsche Boxtser S - Silver & Chrome - Died from IMS failure AFTER IMS was replaced!

Last edited by Homeboy981; 10-07-2012 at 05:43 AM. Reason: icon dead
Homeboy981 is offline   Reply With Quote
Old 10-07-2012, 05:56 AM   #5
Registered User
 
Join Date: May 2011
Location: Miami florida
Posts: 1,591
Just a suggestion. You really should flush, not bleed the brakes before each track day because brake fluid, and even more so, race fluid,absorbs water. You need to get new fluid into the entire system. I use a little less than a litre to flush the entire system. If you alternate between ATE blue and gold, you know exactly when you have gotten the old fluid out.
__________________
Current car

2000 Boxster 2.7l red/black

Previous cars

1973 Opel Manta
1969(?) Fiat 850 Convertible
1979 Lancia Beta Coupe
1981 Alfa Romeo GTV 6
1985 Alfa Romeo Graduate
1985 Porsche 944
1989 Porsche 944
1981 Triumph TR7
1989 (?) Alfa Romeo Milano
1993 Saab 9000
san rensho is offline   Reply With Quote
Old 10-07-2012, 09:19 AM   #6
Registered User
 
The Radium King's Avatar
 
Join Date: Apr 2010
Location: Canada
Posts: 2,887
yes i should. i swear by the motul after cooking ate, but do understand that the same qualities that make it a higher temp fluid also make it like water more. where i live, however, i gotta ship it in by the 1/2 litre and it is expensive. also, never quite know when i am done a flush - they should make it in two colours like ate.

i should just suck it up and flush instead of bleed after every track event - same amount of work (as long as i don't do the clutch - ug).
The Radium King is offline   Reply With Quote
Old 10-07-2012, 04:21 PM   #7
Registered User
 
Join Date: May 2011
Location: Miami florida
Posts: 1,591
You cooked the ATE? Its not the best fluid but its not bad. I've only used Ate on the track with my stock car and never had a brake fluid problem. Did your brake go to the floor on the track? Motul is great fluid but you might want to try a flush with ATE blue, so you are sure the system is completely flushed.
__________________
Current car

2000 Boxster 2.7l red/black

Previous cars

1973 Opel Manta
1969(?) Fiat 850 Convertible
1979 Lancia Beta Coupe
1981 Alfa Romeo GTV 6
1985 Alfa Romeo Graduate
1985 Porsche 944
1989 Porsche 944
1981 Triumph TR7
1989 (?) Alfa Romeo Milano
1993 Saab 9000
san rensho is offline   Reply With Quote
Old 10-07-2012, 05:42 PM   #8
Registered User
 
The Radium King's Avatar
 
Join Date: Apr 2010
Location: Canada
Posts: 2,887
didn't loose the brakes (i tend to loose third before i lose the brakes - gotta get a transmission cooler going) but the fluid was obviously cooked when i bled them afterwards. put motul in and never a problem since. i'm going to run a full litre through on my subsequent bleeds, ignore the clutch, and call it good.
The Radium King is offline   Reply With Quote
Old 10-08-2012, 04:24 AM   #9
Registered User
 
Join Date: Apr 2008
Location: Southern New jersey
Posts: 1,054
Have you had brake problems with your current procedure? If not, there's no real reason to change, and use more fluid than necessary.
stephen wilson is offline   Reply With Quote
Old 10-08-2012, 06:16 AM   #10
Certified Boxster Addict
 
Join Date: Nov 2010
Location: Los Angeles
Posts: 7,426
Interesting. I do ~25 track days a year and heat the brakes to the point of smoking on a somewhat regular basis yet only do a fluid flush every year and never have a problem.

Occasionally, I experience "pad fade" where I have to exert much more pressure than normal to get the car to slow down but the braking performance recovers to normal after the brakes have cooled. What symptoms are you experiencing that points to boiled brake fluid?
__________________
1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
thstone is offline   Reply With Quote
Old 10-08-2012, 06:31 AM   #11
Registered User
 
Join Date: Jul 2009
Location: Arlington Heights, IL
Posts: 1,557
Quote:
Originally Posted by thstone View Post
Interesting. I do ~25 track days a year and heat the brakes to the point of smoking on a somewhat regular basis yet only do a fluid flush every year and never have a problem.
Interesting.

Are these PCA events?

How do you properly pass tech inspection, with only a yearly brake fluid flush? I know our Chicago Region PCA requires a brake fluid flush between track events to properly pass tech inspection and the form that is signed by the driver.
Flavor 987S is offline   Reply With Quote
Old 10-08-2012, 06:32 AM   #12
Registered User
 
jb92563's Avatar
 
Join Date: Apr 2012
Location: Riverside, CA
Posts: 1,664
Brake fluid absorbs water but with only the small surface of the Brake fluid reservoir and capped at that, where could all this water be coming from that the fluid is absorbing?

Just asking. I always thought that air bubbles were the culprit of a soft pedal.

Boiling the fluid is another matter and I thought those antisqueel pads served dual purpose of insulating the pistons from the source of heat (Brake Pads) and hence prevent boiling the fluid.

A good supply of cooling air could also help that situation which I read can be improved by installing the Carrera 4 front brake air directors.
__________________
"It broke because it wants to be Upgraded "
2012 Porsche Performance Driving School - SanDiego region
2001 Boxster S, Top Speed muffler, (Fred's) Mini Morimotto Projectors, Tarret UDP,
Short Shifter, Touch Screen Dual Din Radio, 03 4 Bow glass Top (DD & Auto-X since May 17,2012)
jb92563 is offline   Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -8. The time now is 03:55 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page