Issues With Front Brake Pads - Dorkiphus.net
Navigation » Dorkiphus.net > Technical & Track Disussions > Porsche Technical Discussions » Issues With Front Brake Pads

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

Reply
 
Thread Tools Display Modes
  #1  
Old 03-05-2011, 11:10 PM
Snoopy's Avatar
Snoopy Snoopy is offline
 
Join Date: Jun 2008
Location: Germantown MD
Posts: 65
Snoopy
Default Issues With Front Brake Pads

What started out as a simple chore to change the front pads on my 85 911 has turned into, well let's just say no simple job ever stays simple. As it turns out the pad retaining pins are refusing to come out. I am out of easy ideas, the next step is cutting them in half and see if I can work them loose that way. I don ont care if they get distroyed at this point, as I have new ones on order. If anyone out there as additional ideas they would be appriciated. Beside buying a big break kit, wife would kill me.
__________________
Chris
85 Targa
Custom Exhaust, Cat By-Pass & S. Wong Chip
Past
'77 Targa x2
Reply With Quote
  #2  
Old 03-06-2011, 07:38 AM
HoodPin's Avatar
HoodPin HoodPin is offline
 
Join Date: Dec 2004
Location: Monrovia, MD
Posts: 10,765
HoodPin
Default

I know I still owe you from your lock-nut ordeal.

But on the P-cars I've worked on (944's and Boxster), the retaining pin is accessible from the outside of the caliper, and a drift that fits in the opening can be used to punch it through. And on some, there's a flat-metal spring that sits between the pins and the tops of the pads. If you don't simultaneously compress the spring off of the pin, the pin will be MUCH harder to remove.
__________________
- Tony P.

Currently
- 1984 944 SP2 racer
- 1977 911 KM Special vintage racer
- 2000 Boxster S (now mine)
- 1995 993 (garage queen)
- 2007 Cayman S (wife's track beast)
- 2017 F350 (tow monster)
- 2018 Jeep Wrangler
- 1982 911 Targa (resurrection in process)
Gone but not forgotten
- 1989 944S2
- 1979 RX7
- 1986 944
- 1991 944S2 (in car heaven...)
- 2001 Chevy Suburban 2500 (FIL's beast now)
- 2012 Cayman R
Reply With Quote
  #3  
Old 03-06-2011, 10:23 AM
Dr K's Avatar
Dr K Dr K is offline
Colorado's finest
 
Join Date: Apr 2005
Location: Montgomery County, MD
Posts: 16,353
Dr K has two HoF threadsDr K has two HoF threads
Default

On SCs/Carreras, there are two retention methods. One is a circumferential spring that compresses in the caliper when the pin is fully inserted. If this is what you have, I'd try Kroil and heat to the inside part of the caliper where the pin gets "hammered" into place. The other method (which I believe was only on SCs originally but I've seen it on Carreras) is the little clip that goes through a hole in the retention pin just inside the inside plate of the caliper.

Finally, use the PROPER drift to get the best force pushing the pin out. I have one if you'd like to borrow (I'm less than 15 minutes from Germantown). I can also show you the different retention pin styles so you know what you're working with.
__________________
Peter (not "Pete") K.

2026 Lucid Gravity Grand Touring (EV Tow Vehicle)
1997 Spec Boxster #671
2016 Cayman S
2016 Toyota Highlander--wife's DD
2017 VW GTI SE (DD)

Gone and missed:
2003 Miata ("SM") race car
1992 Miata ("SSM") race car
2009 911 C2S Coupe
2004 Toyota Prius - sold to son's girlfriend
2006 Dodge Durango
2003 Acura MDX
86 Black 911 Coupe race car
86 Gold 911 Targa
82 WineRedMetallic 911 Targa
Reply With Quote
  #4  
Old 03-06-2011, 10:56 AM
BMAN's Avatar
BMAN BMAN is offline
Cushion Convector
 
Join Date: Jun 2009
Location: Baltimore
Posts: 2,228
BMAN
Default

I had this exact problem yesterday too!

I've changed pads many times but never had so much difficulty. In this case I was working on my wife's Cayenne but the setup is very familar. There was a lot of baked on dust/dirty that I worked for hours trying to clean; unfortuantely I didn't have Kroil but I am ordering today. I tried several other cleaners and lubricants but no luck. I didn't try heat because it was lathered in flammable lubricants and I was frustrated.

Is it possible these pins can deform? Hard to believe in a street car/truck.

Proper drift? Don't have that either....hammering with a screwdriver
__________________
_______
Brian
'71 T
'72 E
'80 Weissach SC
'94 C2
'05 996 GT3 CUP
'09 White Winged Cayman S (Hers, all hers!)
'11 GTS/C4S Donuts
'15 Boxster S #Blubyu
Reply With Quote
  #5  
Old 03-06-2011, 11:54 AM
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 it's the pads themselves that are stuck? Try inserting a screwdriver between the pad and rotor and pry apart. Try it in several places to work the piston back into the caliper. Repeat on the others until you can pull the pads out. Can also use a Philips or drift to jacks the pads out. Don’t know how you could cut the pads in half while still in the calipers?
__________________
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
  #6  
Old 03-06-2011, 02:10 PM
BMAN's Avatar
BMAN BMAN is offline
Cushion Convector
 
Join Date: Jun 2009
Location: Baltimore
Posts: 2,228
BMAN
Default

Quote:
Originally Posted by Trak Ratt View Post
[COLOR=#323232][FONT=Verdana]If it's the pads themselves that are stuck?
TR in my case it's the pin/retaining rod that runs on top of the pads & spring clip holding them in the caliper. It slides in/out of holes in the caliper. I can get the pin to slide about 50% out but no further. It seems like the pin is swollen in the middle and won't fit through the hole.
__________________
_______
Brian
'71 T
'72 E
'80 Weissach SC
'94 C2
'05 996 GT3 CUP
'09 White Winged Cayman S (Hers, all hers!)
'11 GTS/C4S Donuts
'15 Boxster S #Blubyu
Reply With Quote
  #7  
Old 03-06-2011, 03:04 PM
Dr K's Avatar
Dr K Dr K is offline
Colorado's finest
 
Join Date: Apr 2005
Location: Montgomery County, MD
Posts: 16,353
Dr K has two HoF threadsDr K has two HoF threads
Default

If it slides 50%, penetrating oil is not the problem. There's probably a little crimp in it (turn it around and look) - this happens all the time to by drill bits, and they won't fit back in the indexed storage holder. If you find a little piece of metal sticking out (more like a splinter than a whole swollen limb, if you know what I mean) you can gently grind off with a Dremel. Otherwise, get the right tool, line it up very straight, and hit it with a little more force.
__________________
Peter (not "Pete") K.

2026 Lucid Gravity Grand Touring (EV Tow Vehicle)
1997 Spec Boxster #671
2016 Cayman S
2016 Toyota Highlander--wife's DD
2017 VW GTI SE (DD)

Gone and missed:
2003 Miata ("SM") race car
1992 Miata ("SSM") race car
2009 911 C2S Coupe
2004 Toyota Prius - sold to son's girlfriend
2006 Dodge Durango
2003 Acura MDX
86 Black 911 Coupe race car
86 Gold 911 Targa
82 WineRedMetallic 911 Targa
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