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

Reply
 
LinkBack Thread Tools Display Modes
Old 09-17-2018, 02:23 PM   #1
Registered User
 
njbray's Avatar
 
Join Date: Sep 2014
Location: santa barbara, CA & Devon, UK
Posts: 304
Brake rotor limits.

My front rotors measure 22.5mm thick - The minimum for front rotors is 22.6mm.
Sooo... I'm wondering if I need to replace them ASAP of if I can wait until after
Rennsport Vl which is next week. We will be driving up and back on Highway 1, hopefully at a spirited pace!
Is a bit risky to put 5 or 600 miles on these? or is there still enough to be OK?
I'm just a bit short on time.
njbray is offline   Reply With Quote
Old 09-17-2018, 02:30 PM   #2
Certified Boxster Addict
 
Join Date: Nov 2010
Location: Los Angeles
Posts: 7,426
Yes, they will be fine. Just make sure that your pads are in good shape.

(assuming that they are solid rotors, the above is fine. If the rotors are drilled, don't drive them if they have cracks coming from the drilled holes)
__________________
1999 996 C2 - sold - bought back - sold for more
1997 Spec Boxster BSR #254
1979 911 SC
POC Licensed DE/TT Instructor

Last edited by thstone; 09-17-2018 at 02:32 PM.
thstone is offline   Reply With Quote
Old 09-17-2018, 04:39 PM   #3
Registered User
 
njbray's Avatar
 
Join Date: Sep 2014
Location: santa barbara, CA & Devon, UK
Posts: 304
The pads and rotors are all genuine Porsche, with about 5mm on pads.
I just don't want this to happen!!!....Especially on Highway 1
njbray is offline   Reply With Quote
Old 09-17-2018, 04:53 PM   #4
Registered User
 
steved0x's Avatar
 
Join Date: Dec 2012
Location: FL
Posts: 3,872
I think that the front base rotors are 24mm new, replace at 22mm, and don't machine them.if they are below 22.6mm so i bet you are good and at 22.5mm you still have a quarter of life left and many thousands of miles? Naturally i don't have my book handy...
steved0x is offline   Reply With Quote
Old 09-17-2018, 07:11 PM   #5
1997, PCA Riverside
 
rexcramer's Avatar
 
Join Date: Aug 2015
Location: Upland, CA
Posts: 1,044
Garage
That brings new meaning to 'slotted and vented.'

Quote:
Originally Posted by njbray View Post
rexcramer is offline   Reply With Quote
Old 09-18-2018, 08:08 AM   #6
Registered User
 
steved0x's Avatar
 
Join Date: Dec 2012
Location: FL
Posts: 3,872
Quote:
Originally Posted by steved0x View Post
I think that the front base rotors are 24mm new, replace at 22mm, and don't machine them.if they are below 22.6mm so i bet you are good and at 22.5mm you still have a quarter of life left and many thousands of miles? Naturally i don't have my book handy...
More info here:
https://wiki.bentleypublishers.com/pages/viewpage.action?pageId=12910663


steved0x is offline   Reply With Quote
Old 09-18-2018, 09:02 AM   #7
Registered User
 
njbray's Avatar
 
Join Date: Sep 2014
Location: santa barbara, CA & Devon, UK
Posts: 304
The 22.6mm seems the correct minimum.
I'm gonna change out the whole lot - just can't do it before next week!

Now it's a question of re-using existing still good pads on new discs or all new pads/discs.
njbray is offline   Reply With Quote
Old 09-18-2018, 09:31 AM   #8
Registered User
 
Join Date: Dec 2016
Location: Clifton, NJ
Posts: 735
you got a bunch of wear left. No need to replace them yet.
Quadcammer is offline   Reply With Quote
Old 09-18-2018, 10:10 AM   #9
MWS
Registered User
 
Join Date: May 2016
Location: Northern Indiana
Posts: 410
Quote:
Originally Posted by njbray View Post
Now it's a question of re-using existing still good pads on new discs or all new pads/discs.
Pardon me for saying so, but to me this seems like the obvious "while you're there, might as well" scenario. Any defect on the rotor will mirror itself on the pad, so a pristine rotor should be matched with a pristine pad.

Anytime that I've every tried to save a buck by scrimping, I've always wished I hadn't and ended up with that "why in the hell did I do that?" moment, followed by cursing myself and promising to NEVER do it again...lol. Don't be me.
MWS is offline   Reply With Quote
Old 09-18-2018, 11:31 AM   #10
Registered User
 
steved0x's Avatar
 
Join Date: Dec 2012
Location: FL
Posts: 3,872
Quote:
Originally Posted by njbray View Post
The 22.6mm seems the correct minimum.
I'm gonna change out the whole lot - just can't do it before next week!

Now it's a question of re-using existing still good pads on new discs or all new pads/discs.
22mm is the wear limit, 22.6mm is only a factor if you need to "turn" the rotor, if you are at 22.5mm you still have 25% left (24mm new, 22m wear limit, which is 1mm per side) which is likely tens of thousands of miles remaining.

If you still have good pads, I would say wait

If you want to do your brakes anyway (it is satisfying to do them all and is is not too difficult), I would say go new all around, new pads to go with your new rotors.

Steve
steved0x 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 01:02 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