Go Back   986 Forum - for Porsche Boxster & Cayman Owners > Porsche Boxster & Cayman Forums > Boxster General Discussions

Reply
 
LinkBack Thread Tools Display Modes
Old 08-29-2015, 11:27 PM   #1
Registered User
 
Join Date: Nov 2014
Location: Palo Alto, CA
Posts: 18
Diagnosing brakes: One caliper stuck, and no luck bleeding

I'm having two problems with my 2001 Boxster brakes:

1) .5 miles from home, the rear driver's side brake became stuck one night while driving. I made it home and smoke was coming from the pads.

2) After cleaning the rear driver's side brake caliper,* I began bleeding the brakes using a Motive pressure bleeder. I tried both rear passenger's side and rear driver's side, but with both of these, <20ml of fluid came out of the bleed nipples. I left the system attached and pressurized for 20mins and no additional liquid came out. This is unexpected

Any diagnostic advice much appreciated. Tomorrow I'll try a 2-person bleed to see if I'm able to get more fluid flow that way, and also try bleeding the front brakes.

*To diagnose 1, I disassembled, cleaned, and reassembled the caliper. There was no pitting, corrosion, or scoring on the pistons. All pistons came out by applying ~120PSI air pressure. There were no tears in the dust boots. I had planned to buy new pressure seals and dust boots, and probably still will, but I think the root cause may be an issue with the hydraulic connection because of (2).

gonzojive is offline   Reply With Quote
Old 08-30-2015, 07:36 AM   #2
Registered User
 
Join Date: Dec 2012
Location: DE
Posts: 123
There is a single hard line from the master cylinder area that feeds both rear calipers. It runs along the driver's side of the car near the pinch weld. I suggest examining it for possible damage.
spendy is offline   Reply With Quote
Old 08-30-2015, 11:29 AM   #3
Certified Boxster Addict
 
Join Date: Nov 2010
Location: Los Angeles
Posts: 7,517
Master cylinder failure. Clogged/debris in brake line. Damaged brake line.
__________________
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 08-30-2015, 06:54 PM   #4
Registered User
 
woodsman's Avatar
 
Join Date: Feb 2013
Location: Land of naught
Posts: 1,302
ABS pump???
__________________
Death is certain, life is not.
woodsman is offline   Reply With Quote
Old 08-31-2015, 05:10 AM   #5
Registered User
 
ppbon's Avatar
 
Join Date: Nov 2005
Location: Florida
Posts: 529
From the description of symptoms ...

... the most obvious cause is a clogged flexible brake line.
Believe it or not, flexible brake lines are wear items.
Happy Boxstering
Pedro

Quote:
Originally Posted by gonzojive View Post
I'm having two problems with my 2001 Boxster brakes:

1) .5 miles from home, the rear driver's side brake became stuck one night while driving. I made it home and smoke was coming from the pads.

2) After cleaning the rear driver's side brake caliper,* I began bleeding the brakes using a Motive pressure bleeder. I tried both rear passenger's side and rear driver's side, but with both of these, <20ml of fluid came out of the bleed nipples. I left the system attached and pressurized for 20mins and no additional liquid came out. This is unexpected

Any diagnostic advice much appreciated. Tomorrow I'll try a 2-person bleed to see if I'm able to get more fluid flow that way, and also try bleeding the front brakes.

*To diagnose 1, I disassembled, cleaned, and reassembled the caliper. There was no pitting, corrosion, or scoring on the pistons. All pistons came out by applying ~120PSI air pressure. There were no tears in the dust boots. I had planned to buy new pressure seals and dust boots, and probably still will, but I think the root cause may be an issue with the hydraulic connection because of (2).

__________________
Racecar spelled backwards is: Racecar!
ppbon 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 03:44 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