955/957 Cayenne DIY: Front Rotors and Pads - Page 17 - Rennlist - Porsche Discussion Forums

Go Back  Rennlist - Porsche Discussion Forums > DIYs and "How To" Archive > Cayenne DIY
Reload this Page >

955/957 Cayenne DIY: Front Rotors and Pads

Notices

955/957 Cayenne DIY: Front Rotors and Pads

 
Old 04-16-2018, 12:11 PM
  #241  
Petza914
Addict
Rennlist Member
 
Petza914's Avatar
 
Join Date: Oct 2007
Location: Clemson, SC
Posts: 9,503
Default

Originally Posted by HAYJAM View Post
I went to do my brakes on an 09 Cayenne base and seem to have issues with the replacement rotor which are EBC rotors. Are the rotors supposed to be friction fit? The ones that are currently on slip on and off without issue. The new ones are not going on all the way. I can see a small gap between the rotor and lug hole except where the bolt is that holds the rotor to hub it seems to pull it tight to the hub. With that, it makes it impossible to mount the caliper - The pins for the pads are hitting the rotor making it cockeyed. I went ahead and mounted the tire and sungged up the bolts then removed it. The rotor was on there tight, but still looked it could be pushed on more - At this point I still could not get the caliper back on. I have taken it back off and put the old one back on. Is this normal or the EBC rotor out of spec, perhaps?

Thanks in advance
Sounds like you have a problem with the new rotor where either the center bore diameter is incorrect or the offset of the rotor is incorrect, or both. Usually rotors slip on without any interference and are held in place with the extra screw that goes through the rotor and into the hub. The rotors are secured for use by the lug bolts. Center bore should be 71.6mm for a press fit trying to take advantage of the hub-centric mounting, or slightly larger if not. If you have a digital caliper, maybe you can check the center bore spec of the new rotor. Also, while taking measurements, check the distance from the face of the rotor hat or hub to the face of the rotor and see if they're the same as the old rotor.

Last edited by Petza914; 04-17-2018 at 09:45 AM.
Petza914 is offline  
Old 04-17-2018, 12:14 AM
  #242  
HAYJAM
User
 
Join Date: Feb 2018
Posts: 9
Default

Originally Posted by Petza914 View Post
Sounds like you have a problem with the new rotor where either the center bore diameter is incorrect ir the offset of the rotor us incorrect, or both. Usually rotors slip on without any interference and are held in place with the extra screw that goes through the rotor and into the hub. The rotors are secured for use by the lug bolts. Center bore should be 71.6mm for a press fit trying g yo take advantage of the hub-centric mounting or larger if not. If you have a digital caliper, maybe you can check the center bore spec of the new rotor. Also, while taking measurements, check the distance from the face of the rotor hat or hub to the face of the rotor and see if they're the same as the old rotor.
Thanks for the response. The center bore measures approx. 85mm. I think the issue is the inner dimension of the rotor that goes over the outside edges of the hub. Unfortunately I haven't found what that dimension should be as of yet. The area needed to measure is the deepest part of the rotor which I can't really reach with the calipers. I'll have to come up with a methodology of making the measurement to compare to the old one.
HAYJAM is offline  
Old 04-17-2018, 11:23 AM
  #243  
Petza914
Addict
Rennlist Member
 
Petza914's Avatar
 
Join Date: Oct 2007
Location: Clemson, SC
Posts: 9,503
Default

Originally Posted by HAYJAM View Post
Thanks for the response. The center bore measures approx. 85mm. I think the issue is the inner dimension of the rotor that goes over the outside edges of the hub. Unfortunately I haven't found what that dimension should be as of yet. The area needed to measure is the deepest part of the rotor which I can't really reach with the calipers. I'll have to come up with a methodology of making the measurement to compare to the old one.
If you pick up one of these measuring devices, not only can you measure inside and outside dimensions, but the rod that protrudes through the back will let you measure depth too. This is the easiest way to measure distance from the face plane of the hub to the face plane of the rotor like I'm measuring depth of the caliper mounting hole in this photo. You can probably find one at Harbor Freight, Northern Tool, or maybe even Lowes or Home Depot.




Petza914 is offline  
Old 10-12-2018, 10:59 PM
  #244  
CarlosCA
User
 
Join Date: Jan 2013
Location: NoCal
Posts: 81
Default Seem to be missing something here

The post is titled "Rotors & Pads" but from what I can tell the pics & commentary from way back when go right to pad replacement after pulling the pads out. No detail on rotor replacement such as when the T50 is needed. Did I miss a link somewhere? thanks
CarlosCA is offline  
 

Thread Tools
Search this Thread
Quick Reply: 955/957 Cayenne DIY: Front Rotors and Pads


Contact Us About Us Advertising Cookie Policy Privacy Statement Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.