brake pad question - Dorkiphus.net

Porsche Technical Discussions Porsche related technical discussions and questions go here.

Reply
 
Thread Tools Display Modes
  #1  
Old 07-03-2007, 07:29 PM
good hands's Avatar
good hands good hands is offline
Pro DE driver
 
Join Date: Mar 2006
Location: purcellville
Posts: 4,918
good hands
Default brake pad question

Being a newbie to doing my own work i was wondering when do you know when you should change brake pads. I am currently running pagid orange on my 911 carrera with stock brakes. After the Glen i have about as much pad as the backing both front and rear. Also this is the second time my fronts and rears have worn about the same. I thought the fronts always went quicker. the car is now only driven on the track and to and from the track. thanks for the input.
__________________
Scott Bresnahan
Purcellville Va.


2014 GTB1 World Champion
8 Time National DE champion

88 911 Cup
2021 GT4
13 Boxster S
1969 Saab Sonett
2013 Cayenne
2014 F150
Hurricane race trailer with A/C
05 Cup car
02 Koni 996
Reply With Quote
  #2  
Old 07-03-2007, 07:37 PM
Trak Ratt's Avatar
Trak Ratt Trak Ratt is offline
Senior Curmudgeon
 
Join Date: Mar 2003
Location: Alexandria/Mt. Vernon, Va
Posts: 27,369
Trak Ratt has one HoF thread
Default

If you’re happy with them run like pads for a while more. The lower run groups (and you’re no longer a part of that pack) tend to burn through pads faster. If you aren’t locking up the rears it could be that the brake lines are bad (not releasing the pads) and causing them to wear faster. Or just an anomaly from the lower group. Don’t listen to anyone about switching over to PF97s your too fast now as it is
__________________
David

I hope to arrive to my death, late, in love, and a little drunk!

Just because I don't care doesn't mean I don't understand... Homer Simpson

"That's what's keeping me out of F1.... Too much mental maturity...." N0tt0n

Some cause happiness wherever they go; others whenever they go.

CHAOS, PANIC, AND DISORDER my work here is done...

Live without pretending, Love without depending, Listen without defending, Speak without offending
Reply With Quote
  #3  
Old 07-03-2007, 07:39 PM
good hands's Avatar
good hands good hands is offline
Pro DE driver
 
Join Date: Mar 2006
Location: purcellville
Posts: 4,918
good hands
Default

Quote:
Originally Posted by david riley View Post
If you’re happy with them run like pads for a while more. The lower run groups (and you’re no longer a part of that pack) tend to burn through pads faster. If you aren’t locking up the rears it could be that the brake lines are bad (not releasing the pads) and causing them to wear faster. Or just an anomaly from the lower group. Don’t listen to anyone about switching over to PF97s your too fast now as it is
Sorry DR, i think you misinterpreted my question. when is it time to change brake pads. Not brake pad brands .
__________________
Scott Bresnahan
Purcellville Va.


2014 GTB1 World Champion
8 Time National DE champion

88 911 Cup
2021 GT4
13 Boxster S
1969 Saab Sonett
2013 Cayenne
2014 F150
Hurricane race trailer with A/C
05 Cup car
02 Koni 996
Reply With Quote
  #4  
Old 07-03-2007, 07:43 PM
Trak Ratt's Avatar
Trak Ratt Trak Ratt is offline
Senior Curmudgeon
 
Join Date: Mar 2003
Location: Alexandria/Mt. Vernon, Va
Posts: 27,369
Trak Ratt has one HoF thread
Default

Quote:
Originally Posted by good hands View Post
Sorry DR, i think you misinterpreted my question. when is it time to change brake pads. Not brake pad brands .
= to the width of the backing plate at the end of the day. Wear accellerates as pad get thin.
__________________
David

I hope to arrive to my death, late, in love, and a little drunk!

Just because I don't care doesn't mean I don't understand... Homer Simpson

"That's what's keeping me out of F1.... Too much mental maturity...." N0tt0n

Some cause happiness wherever they go; others whenever they go.

CHAOS, PANIC, AND DISORDER my work here is done...

Live without pretending, Love without depending, Listen without defending, Speak without offending
Reply With Quote
  #5  
Old 07-03-2007, 07:54 PM
BobNovas's Avatar
BobNovas BobNovas is offline
 
Join Date: Dec 2003
Location: Rockville, MD
Posts: 1,475
BobNovas
Default

The time is now. When the pad thickness == the backing plate thickness, stick a fork in 'em, the pad's are done.

I can't remember whether my experience with stock 88 Carerra brakes and pagid orange pads was that the fronts and rears wore equally quickly. But, I wouldn't be surprised if that were the case.
__________________
88 911
00 Boxster S (wife's ride, becoming mine too)

Even duct tape can't fix stupid... but it can muffle the sound!
Reply With Quote
  #6  
Old 07-03-2007, 08:05 PM
good hands's Avatar
good hands good hands is offline
Pro DE driver
 
Join Date: Mar 2006
Location: purcellville
Posts: 4,918
good hands
Default

Quote:
Originally Posted by david riley View Post
group. Don’t listen to anyone about switching over to PF97s your too fast now as it is
my last set was pf 97's. i am back to pagids.

thanks for the input.

time to get my hands and knees dirty.
__________________
Scott Bresnahan
Purcellville Va.


2014 GTB1 World Champion
8 Time National DE champion

88 911 Cup
2021 GT4
13 Boxster S
1969 Saab Sonett
2013 Cayenne
2014 F150
Hurricane race trailer with A/C
05 Cup car
02 Koni 996
Reply With Quote
  #7  
Old 07-03-2007, 08:08 PM
Terry #44's Avatar
Terry #44 Terry #44 is offline
 
Join Date: Apr 2004
Location: Leesburg, VA
Posts: 186
Terry #44
Default

I replace them well before they get to the point at which yours are, but i go more by brake feel than pad thickness. On my car, when they get get about half way worn, I think too much fluid is allowed into the caliper, where it gets hot and boils, causing a mushy feel. If they don't firm up after a bleed, they go in the trash.
__________________
Terry Thomas
1989 944S2 #44
2006 Cayman S
Reply With Quote
  #8  
Old 07-03-2007, 08:28 PM
Trak Ratt's Avatar
Trak Ratt Trak Ratt is offline
Senior Curmudgeon
 
Join Date: Mar 2003
Location: Alexandria/Mt. Vernon, Va
Posts: 27,369
Trak Ratt has one HoF thread
Default

Terry has the right idea. The ”= backing plate” is the tech inspector’s rule and considered the minimum. I also change mine well before that point. I keep the last set as a spare, though I usually compare with the last last set and keep which ever set is thicker the spares. Surprising, all seem to end up about the same.
__________________
David

I hope to arrive to my death, late, in love, and a little drunk!

Just because I don't care doesn't mean I don't understand... Homer Simpson

"That's what's keeping me out of F1.... Too much mental maturity...." N0tt0n

Some cause happiness wherever they go; others whenever they go.

CHAOS, PANIC, AND DISORDER my work here is done...

Live without pretending, Love without depending, Listen without defending, Speak without offending
Reply With Quote
  #9  
Old 07-03-2007, 08:29 PM
TD in DC's Avatar
TD in DC TD in DC is offline
 
Join Date: Mar 2005
Location: In DC of course . . .
Posts: 9,949
TD in DC
Default

x 2 on the advice. Also, make sure that you check the inside pads as well. Sometimes they do not wear evenly and you think you have plenty of pad but you really do not.

Finally, I carry extra rotors just in case.
__________________
Thank Me Dammit!
Reply With Quote
  #10  
Old 07-03-2007, 08:30 PM
good hands's Avatar
good hands good hands is offline
Pro DE driver
 
Join Date: Mar 2006
Location: purcellville
Posts: 4,918
good hands
Default

how about the rotors ? Do i need to buy a measurement tool or is that something done by observation also ?
__________________
Scott Bresnahan
Purcellville Va.


2014 GTB1 World Champion
8 Time National DE champion

88 911 Cup
2021 GT4
13 Boxster S
1969 Saab Sonett
2013 Cayenne
2014 F150
Hurricane race trailer with A/C
05 Cup car
02 Koni 996
Reply With Quote
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 Off

Forum Jump