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

 
 
LinkBack Thread Tools Display Modes
Prev Previous Post   Next Post Next
Old 04-30-2010, 05:57 AM   #17
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
 



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 11:08 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