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

Reply
 
LinkBack Thread Tools Display Modes
Old 11-08-2011, 02:15 PM   #1
Registered User
 
Join Date: Mar 2007
Location: Ohio
Posts: 1,622
Question on brakes

I'm getting ready to replace the brake pads on all 4 wheels. The rotors seem to be in decent shape, but have worn a little. There is a thin lip just outside where the pads have worn into the rotors---it's not much, certainly less than 1 mm (but probably more than 0.5 mm). I was talking to a technician at a local Porsche dealership and he said, while these rotors shouldn't be turned, he did say they could be put on a brake lathe and just have that lip taken down.

Does that sound like good advice? My kid wonders why that's even necessary, and I'm not sure I have an answer to that. Recommendations?

Frodo is offline   Reply With Quote
Old 11-08-2011, 02:59 PM   #2
Registered User
 
DFW02S's Avatar
 
Join Date: Nov 2010
Location: DFW
Posts: 380
As long as that ridge is outside the brake pad surface, it's no big deal.
Shouldn't happen with OEM pads.

On some aftermarket (track) pads, it may be inside the pad surface, it will cut into the pad as the pad wears. I don't see it as an issue on my own car.
DFW02S is offline   Reply With Quote
Old 11-08-2011, 03:36 PM   #3
Autobahn Glanz
 
WhipE350's Avatar
 
Join Date: Dec 2010
Location: Charlotte, NC
Posts: 1,282
Garage
Quote:
Originally Posted by DFW02S View Post
As long as that ridge is outside the brake pad surface, it's no big deal.
Shouldn't happen with OEM pads.

On some aftermarket (track) pads, it may be inside the pad surface, it will cut into the pad as the pad wears. I don't see it as an issue on my own car.
+1...ya check the pads you are putting on don't now overlap it. It maybe that the technician had that concern, or was just trying to make some extra $. If the pads are the same I wouldn't take the lathe to it, but maybe others can think of a reason. A lip of 5mm is not a lot, just about enough to catch your finger nail on, I can't see how it would effect braking.
WhipE350 is offline   Reply With Quote
Old 11-08-2011, 04:37 PM   #4
Certified Boxster Addict
 
Join Date: Nov 2010
Location: Los Angeles
Posts: 7,516
A purist (like the Porsche technician) will always want to start with a perfectly good rotor surface so the new pads can bed in without any risk of problems. This ensures good braking performance and reduces the likelihood of the customer bringing the car back with a problem (one of the tech's biggest concerns).

A pragmatist will say that a 0.5mm lip is almost non-existant in the first place and is not likely to have any affect on braking performance and should be a fine starting place for bedding new pads. And the likelihood of actually having a problem is pretty low and even if you do, you can easily fix it.

Either apporach is generally acceptable and the answer you get generally depends on who you ask.
__________________
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 11-08-2011, 05:05 PM   #5
Registered User
 
Idaho Red Rocket 3's Avatar
 
Join Date: Oct 2010
Location: Nampa, ID.
Posts: 488
I'm of the thought you are better off resurfacing the rotor at the time you replace the pads. Of course you have to have quality rotors to start with. You don't want to resurface cheapo or Chinese rotors because they will warp in a heartbeat. Yes Porsche says you should not resurface theirs, but replace the rotors. Porsche OEM rotors are made of a high quality material and can take a little shaved off. I had mine done for $10 each at a NAPA store that has a very good machine shop. The machinist understood what I wanted and just barely shaved them smooth for me. They work great with the Posi Quite pads I purchased from Houston at Cquence.
__________________
2000 Boxster S
And then there are the Motorcycles.
Idaho Red Rocket 3 is offline   Reply With Quote
Old 11-08-2011, 06:42 PM   #6
Registered User
 
DenverSteve's Avatar
 
Join Date: Jul 2011
Location: Denver/Winter Park, CO USA
Posts: 600
The technician is correct. You don't turn these rotors. If needed, you replace them.
__________________
Denver Steve
Carrera, Cabriolet, 6-Speed, Black/Tan
DenverSteve is offline   Reply With Quote
Old 11-09-2011, 01:03 PM   #7
Registered User
 
jcb986's Avatar
 
Join Date: Apr 2009
Location: Orlando
Posts: 1,266
Replace them around 60K miles. I purchased Balo from Pelican Parts.
__________________
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
Old 11-09-2011, 01:09 PM   #8
Ex Esso kid
 
Join Date: Dec 2005
Location: NY
Posts: 1,605
Quote:
Originally Posted by DenverSteve View Post
The technician is correct. You don't turn these rotors. If needed, you replace them.
There really aren't any that can be turned anymore, they always dissipate heat poorly after that and are prone to warp which then leads to pulsing in the pedal.
Ghostrider 310 is offline   Reply With Quote
Old 11-09-2011, 01:14 PM   #9
Registered User
 
ChrisZang's Avatar
 
Join Date: Mar 2006
Location: San Carlos, CA 94070
Posts: 1,450
Quote:
Originally Posted by Idaho Red Rocket 3 View Post
I'm of the thought you are better off resurfacing the rotor at the time you replace the pads. Of course you have to have quality rotors to start with. You don't want to resurface cheapo or Chinese rotors because they will warp in a heartbeat. Yes Porsche says you should not resurface theirs, but replace the rotors. Porsche OEM rotors are made of a high quality material and can take a little shaved off. I had mine done for $10 each at a NAPA store that has a very good machine shop. The machinist understood what I wanted and just barely shaved them smooth for me. They work great with the Posi Quite pads I purchased from Houston at Cquence.
He has an "S" meaning the rotors are cross drilled.
I don't think you can machine cross drilled rotors
__________________
I still wave at Boxsters, but they no longer wave back :-(
2002 Boxster S "Violet" (sold but not forgotten)
2009 Carrera 4S "Kelsey" (current ride)
2015 FIAT 500e "Nikki" my commuter car
ChrisZang is offline   Reply With Quote
Old 11-09-2011, 01:39 PM   #10
Registered User
 
DFW02S's Avatar
 
Join Date: Nov 2010
Location: DFW
Posts: 380
Quote:
Originally Posted by ChrisZang View Post
.....
I don't think you can machine cross drilled rotors
You can, but the operator needs to be patient.

DFW02S 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 04:55 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