05-25-2019, 06:17 PM
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#1
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Registered User
Join Date: Dec 2015
Location: Denver
Posts: 866
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Brake Fluid Change
So, if I drive the P car during spring/summer approx 5-6 months with 1,000 to 1,500 miles, store in winter does it need brake fluid change ~ 2 years?
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5280 Cruising @High Altitude
Seal Gray & K&N Filter
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05-26-2019, 05:06 AM
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#2
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Registered User
Join Date: Nov 2006
Location: In the garage...
Posts: 1,735
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yes every 2yrs... brake fluid is hygroscopic.
You change motor oil annually, right?
Learn to DIY and it's < $20 per (plus one time cost of motive power bleeder ~ $70).
Plus, gives you opportunity to inspect all the braking components
Good luck 
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"Cool Prius!" - Nobody
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05-26-2019, 08:57 AM
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#3
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2003 S, Arctic Silver, M6
Join Date: Oct 2014
Location: Winnipeg, MB, Canada
Posts: 1,346
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It also gives you a reason to remove your wheels and give the them a good s=cleaning on teh inside as well as inspect your suspension and other goodies that are hard to get to. Using the power bleeder makes it a one man job and a lot quicker.
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05-29-2019, 06:44 AM
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#4
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Registered User
Join Date: Oct 2008
Location: O.C. CA
Posts: 3,709
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[QUOTE=Burg Boxster;596178]yes every 2yrs... brake fluid is hygroscopic.
You change motor oil annually, right?
No 3 times a year!
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OE engine rebuilt,3.6 litre LN Engineering billet sleeves,triple row IMSB,LN rods. Deep sump oil pan with DT40 oil.
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05-27-2019, 04:04 AM
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#5
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Registered User
Join Date: Aug 2015
Location: Stockholm, Sweden
Posts: 282
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I change the brake fluid at the beginning of every season. I track the car occasionally and after having experienced boiling fluid once, I decided to not do it ever again. 
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05-27-2019, 04:54 AM
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#6
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Registered User
Join Date: Jan 2017
Location: Edmonton,Alberta
Posts: 288
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Overkill for street cars but cheap and easy to do if you have a power bleeder.
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'58 356A coupe, just a driver
'00 Boxster S fair weather - daily driver
'11 Jeep Grand Cherokee Limited - winter daily driver
'92 F250 - junk hauler; previous Porsches '95 993;'08 Cayman S;'70 911E
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05-28-2019, 04:31 PM
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#7
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Certified Boxster Addict
Join Date: Nov 2010
Location: Los Angeles
Posts: 7,669
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I agree, two years is overkill for a street driven car but its not that expensive if you can DIY it.
I race my Spec Boxster and even then I only change the brake fluid once or twice per year.
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1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor
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05-29-2019, 12:27 AM
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#8
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Registered User
Join Date: May 2019
Posts: 77
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the "p car"?
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05-29-2019, 02:00 AM
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#9
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Registered User
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,614
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What you should be doing is monitoring the fluid's moisture content and changing it when it starts to go up; OTC makes a $20 tool that will tell you when it needs to be changed.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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05-29-2019, 08:10 AM
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#10
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Registered User
Join Date: Dec 2015
Location: Denver
Posts: 866
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Quote:
Originally Posted by JFP in PA
What you should be doing is monitoring the fluid's moisture content and changing it when it starts to go up; OTC makes a $20 tool that will tell you when it needs to be changed.
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Great advice PA; where is the OTC tool available?
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5280 Cruising @High Altitude
Seal Gray & K&N Filter
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05-29-2019, 10:20 AM
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#11
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Registered User
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,614
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Quote:
Originally Posted by Ciao
Great advice PA; where is the OTC tool available?
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Anywhere OTC tools are sold, Amazon carries it:
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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05-29-2019, 04:12 PM
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#12
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Registered User
Join Date: Dec 2015
Location: Denver
Posts: 866
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Quote:
Originally Posted by JFP in PA
Anywhere OTC tools are sold, Amazon carries it:
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On order from Amazon chose the Dot4 tool
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5280 Cruising @High Altitude
Seal Gray & K&N Filter
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05-29-2019, 07:19 PM
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#13
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Damn Yankee
Join Date: Mar 2013
Location: Dallas
Posts: 1,117
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Quote:
Originally Posted by JFP in PA
What you should be doing is monitoring the fluid's moisture content and changing it when it starts to go up; OTC makes a $20 tool that will tell you when it needs to be changed.
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Thanks for the tip, JFP. Never knew these devices existed. And thanks for all the expert advice and insights you've contributed over the years.
And I'm not "just sayin....." 
TO
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06-03-2019, 02:55 PM
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#14
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Registered User
Join Date: Dec 2015
Location: Denver
Posts: 866
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This tool may save you time and money. It's been 2 years since I changed/flushed the Brake Fluid. I drive the P car in Summer/Fall. The brake fluid tester shows less than 1% water in the brake fluid and is OK. Without this tester, I would've flushed the brake fluid as recommended by the manual.
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5280 Cruising @High Altitude
Seal Gray & K&N Filter
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06-04-2019, 01:50 AM
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#15
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Registered User
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,614
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Quote:
Originally Posted by Ciao
This tool may save you time and money. It's been 2 years since I changed/flushed the Brake Fluid. I drive the P car in Summer/Fall. The brake fluid tester shows less than 1% water in the brake fluid and is OK. Without this tester, I would've flushed the brake fluid as recommended by the manual.
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That's exactly why we use them in the shop.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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06-04-2019, 04:12 PM
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#16
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Registered User
Join Date: Apr 2016
Location: SE Michigan
Posts: 496
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Neat device but it won't tell if air bubbles trapped in the line? I guess you must feel that.
After 3 years/ 30K miles of ownership I finally got to flush and bleed the lines with Motul 600 and was amazed how easy to lock up front tires now!
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1997 Boxster arctic silver/ red, XNE riveted mahogany/ leather steering wheel & 917-style wood shift knob, Ben’s short shifter, PSE, 996 TB, UDP, stereo/ center console delete, hardtop and speedster humps, daily driver rain or shine or snow!
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06-04-2019, 05:39 PM
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#17
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Registered User
Join Date: Dec 2009
Location: Orange County, CA
Posts: 1,981
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Quote:
Originally Posted by Boxstard
Neat device but it won't tell if air bubbles trapped in the line?
I was amazed how easy to lock up front tires now!
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Boxtard, you may want to bleed the rear axle again.. :-)
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06-05-2019, 03:07 PM
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#18
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Registered User
Join Date: Apr 2016
Location: SE Michigan
Posts: 496
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Quote:
Originally Posted by Gilles
Boxtard, you may want to bleed the rear axle again.. :-)
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I used 1.5L of fluid for pressure bleeding and pretty confident that rear are fine.
In fact I thought by design brake force is biased to front so that rear never lock up before front...
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1997 Boxster arctic silver/ red, XNE riveted mahogany/ leather steering wheel & 917-style wood shift knob, Ben’s short shifter, PSE, 996 TB, UDP, stereo/ center console delete, hardtop and speedster humps, daily driver rain or shine or snow!
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