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

Post Reply
 
LinkBack Thread Tools Display Modes
Old 04-29-2010, 04:56 PM   #1
Registered User
 
Join Date: Feb 2009
Location: Buffalo NY
Posts: 828
When you say it's leaking behind the caliper is it leaking right where the line connects? IMO, you need to remedy any leaks before you can assess the function of the caliper.
eightsandaces is offline   Reply With Quote
Old 04-30-2010, 05:24 AM   #2
Registered User
 
Join Date: Sep 2004
Location: Atlanta
Posts: 1,820
do repair any leaks & bleed the system prior to making this next assessment.

here's a quick primer on calipers. the caliper seals are made of high durometer EPDM. they are square rather than round in profile. when you press your brakes, the pistons don't slide through the seals in a normal braking situation. instead, the pistons extend and the seal STRETCHES a bit. this elasticity is important, as the secondary function of the seal is to actually RETRACT the piston.

EPDM is pretty durable, HOWEVER, if it gets overheated, it will soften. when it softens, it will no longer retract the piston, causing brakes to drag. this, in turn, causes more heat which futher softens the seals & the cycle repeats itself. it is possible that this has or will happen to you. if you fix the system leaks & bleed the system & service the master cylinder and you are STILL having this problem, you may need to replace the caliper seals in one or more calipers.
__________________
insite
'99 Boxster
3.4L Conversion

http://i156.photobucket.com/albums/t...1/KMTGPR-1.jpg
insite is offline   Reply With Quote
Old 04-30-2010, 05:57 AM   #3
Registered User
 
Join Date: Jun 2009
Location: Los Angeles, CA
Posts: 178
Quote:
Originally Posted by insite
do repair any leaks & bleed the system prior to making this next assessment.

here's a quick primer on calipers. the caliper seals are made of high durometer EPDM. they are square rather than round in profile. when you press your brakes, the pistons don't slide through the seals in a normal braking situation. instead, the pistons extend and the seal STRETCHES a bit. this elasticity is important, as the secondary function of the seal is to actually RETRACT the piston.

EPDM is pretty durable, HOWEVER, if it gets overheated, it will soften. when it softens, it will no longer retract the piston, causing brakes to drag. this, in turn, causes more heat which futher softens the seals & the cycle repeats itself. it is possible that this has or will happen to you. if you fix the system leaks & bleed the system & service the master cylinder and you are STILL having this problem, you may need to replace the caliper seals in one or more calipers.
Solid advice: Will be investigating the second week of May, and will update accordingly. Much thanks for all the advice.
__________________
Jonny Wonder
1999 Porsche Boxster 5 Spd
Stock, with GAHH A5 Glass top.
Previous Toys:
2005 RX-8, RIP
1989 GTA, 5 Speed, Procharger Supercharger and 2 Core Intercooler, 1 3/4" headers, 3" Flomaster Exhaust, cat-delete, digital ignition, bigger fuel injectors
Oaktown 986 is offline   Reply With Quote
Old 06-01-2010, 01:29 PM   #4
Registered User
 
Join Date: Jun 2009
Location: Los Angeles, CA
Posts: 178
Ok, so had it checked out by www.abauer.com Porsche, and it was discovered to be a bad booster. Ordered the new part from Pelican ($170 overnighted), and now have to figure out how to actually install it. Any insights? (I've bled the brakes on this guy before, and I've replaced many pads/rotors in my days)
__________________
Jonny Wonder
1999 Porsche Boxster 5 Spd
Stock, with GAHH A5 Glass top.
Previous Toys:
2005 RX-8, RIP
1989 GTA, 5 Speed, Procharger Supercharger and 2 Core Intercooler, 1 3/4" headers, 3" Flomaster Exhaust, cat-delete, digital ignition, bigger fuel injectors
Oaktown 986 is offline   Reply With Quote
Old 06-08-2010, 05:46 PM   #5
Registered User
 
Join Date: Jun 2009
Location: Los Angeles, CA
Posts: 178
bump

any advice?
__________________
Jonny Wonder
1999 Porsche Boxster 5 Spd
Stock, with GAHH A5 Glass top.
Previous Toys:
2005 RX-8, RIP
1989 GTA, 5 Speed, Procharger Supercharger and 2 Core Intercooler, 1 3/4" headers, 3" Flomaster Exhaust, cat-delete, digital ignition, bigger fuel injectors
Oaktown 986 is offline   Reply With Quote
Old 06-09-2010, 04:08 AM   #6
Registered User
 
Join Date: Sep 2004
Location: Atlanta
Posts: 1,820
this really isn't hard. just dig in, & if you hit a hiccup, we'll help you through it.
__________________
insite
'99 Boxster
3.4L Conversion

http://i156.photobucket.com/albums/t...1/KMTGPR-1.jpg
insite is offline   Reply With Quote
Old 06-09-2010, 04:22 AM   #7
Registered User
 
jcb986's Avatar
 
Join Date: Apr 2009
Location: Orlando
Posts: 1,266
here's a few sites for DIY information.

http://www.pedrosgarage.com

http://www.bombaydigital.com/boxster/

http://sites.google.com/site/mikefocke2/mikesporscheboxsterwebpages
__________________
http://i768.photobucket.com/albums/x...6/PC120055.jpg

Old Hippie Young Heart
2000 S/3.2 Liter/Tiptronic/Boxster S Sport Package/Cruise Control/Slate Grey Metallic
Red Special Leather Interior/Red Floor Mats/Red Hand Painted Instrument Dials/Roll Bar/Windstop
Small Carbon Package/Leather Wrap Carbon Wheel/Center Console Exterior Color/Alum Carbon Shift Knob
AM/FM Radio w/CD Player & Changer/Digital Sound Package/18" Turbo Wheels/Wheel Caps w/Colored Crest
jcb986 is offline   Reply With Quote
Post Reply



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 08:28 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2025, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0
Copyright 2025 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page