Pelican Parts
Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   Pelican Parts Forums > Porsche Forums > Porsche 911 Technical Forum


Reply
 
LinkBack Thread Tools Rating: Thread Rating: 1 votes, 5.00 average.
Author
Thread Post New Thread    Reply
Registered
 
Charles Freeborn's Avatar
 
Join Date: Jan 2011
Location: Portland, OR
Posts: 2,945
Garage
Quote:
Originally Posted by cabmando View Post
So because I own a classic German car I'm just supposed to piss away money? Is that what you're saying?
I looked at it from a standpoint that one rotor was only worn by .25mm from new. The other was only worn .50mm from new. So rather than piss away the money on rotors, I spent $25 to have the rotors turned and spent $60 on a low dust performance brake pad. All told, I'm still $19 to the better and should have brakes that function like new.

Easy there tiger, don't take my word for it - read Steve@Rennsports comments on turning rotors:
https://rennlist.com/forums/911-forum/977018-turn-rotors-on-911-a.html
Brake disc question
930 brake rotors Thickness?

I'm certainly not advocating wasting money - my point is that there are things you don't skimp on -brakes and steering being at the top of my list, and that there are other marques that are more economical to maintain.

__________________
Bone stock 1974 911S Targa.
1972 914/4 Race Car
Old 08-22-2017, 01:49 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #61 (permalink)
Brew Master
 
cabmandone's Avatar
 
Join Date: Jul 2013
Location: Delphos OH
Posts: 32,115
Garage
Quote:
Originally Posted by Charles Freeborn View Post
Easy there tiger, don't take my word for it - read Steve@Rennsports comments on turning rotors:
https://rennlist.com/forums/911-forum/977018-turn-rotors-on-911-a.html
Brake disc question
930 brake rotors Thickness?

I'm certainly not advocating wasting money - my point is that there are things you don't skimp on -brakes and steering being at the top of my list, and that there are other marques that are more economical to maintain.
"I NEVER machine/turn rotors on a car unless they are 322mm or larger and will never be used on a race track."
Not sure what he's talking about. Stock thickness is 24 mm. Minimum is 22mm. I'm still above minimum even with the turning that was done. There's a reason they list a minimum thickness. Having brake rotors turned isn't really "skimping" IMO. I have had the rotors turned of almost every vehicle I have owned including an F350 that was used almost strictly for pulling a 3900lb trailer with machines weighing over 8000lbs. I have never suffered a failure due to turned rotors. I have OTOH suffered problems related to stuck caliper pistons and a brake line rupture. So if I were to call something "skimping" I'd have to say it's rebuilding calipers or driving around on old brake lines.
Old 08-22-2017, 02:08 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #62 (permalink)
Registered
 
Join Date: Apr 2016
Posts: 1,176
He means 322 mm in diameter, not thickness. And calipers are meant to be rebuilt, hence the availability of replacement pistons and seals. Rotors are a known disposable part.
Old 08-22-2017, 02:13 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #63 (permalink)
Brew Master
 
cabmandone's Avatar
 
Join Date: Jul 2013
Location: Delphos OH
Posts: 32,115
Garage
Quote:
Originally Posted by Catorce View Post
He means 322 mm in diameter, not thickness. And calipers are meant to be rebuilt, hence the availability of replacement pistons and seals. Rotors are a known disposable part.
Is that why there's a minimum thickness rating for rotors? Because they're supposed to be thrown away? Think about what you're saying before you say it.

Don't get me wrong here. I'm simply going to end the myth here that rotors are supposed to be tossed. It's a silly notion that is based on no real fact. If all four brakes are working properly, there's no reason you shouldn't turn rotors unless their is noticeable bluing of the rotor meaning they have gotten WAY too hot. Then, yes, you get rid of them because they have lost some of the tempering. Otherwise, turning a rotor does not make them any less safe or places like Oreilly's wouldn't do it nor would the shop that did mine.

Last edited by cabmandone; 08-22-2017 at 02:20 PM..
Old 08-22-2017, 02:17 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #64 (permalink)
Registered
 
Jeff NJ's Avatar
 
Join Date: Nov 2013
Location: NW NJ
Posts: 1,242
Quote:
Originally Posted by cabmando View Post
I know exactly where you're talking about. A friend of mine does the event planning there. If you have other family around, tell them to come vote for my car at Canal Days! I never win! A good friend that runs the car show even created a foreign sports car category just for me and I STILL can't win. "No respect... No respect I tell ya"
If you had purchased new rotors, I bet you would have won next time.
__________________
1988 930 Venetian Blue
Old 08-22-2017, 02:41 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #65 (permalink)
Brew Master
 
cabmandone's Avatar
 
Join Date: Jul 2013
Location: Delphos OH
Posts: 32,115
Garage
Quote:
Originally Posted by Jeff NJ View Post
If you had purchased new rotors, I bet you would have won next time.
I never thought of it that way. Maybe I'm dealing with a far more sophisticated group of judges than I was thinking.
On second thought though, I know most of the judges so... no, not really. The worst part is, I was a judge one year and STILL lost.
Old 08-22-2017, 02:54 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #66 (permalink)
 
Registered
 
Join Date: Jun 2009
Location: St Paul MN
Posts: 5,262
Garage
Cab,

When I first read the thread, I was solidly in the "just buy new ones camp." Now, you won me over, I think since rotors have become so cheap, most of us just replace, or we've run them so long that they couldn't be turned safe.

On the other hand is my DD Toyota which are probably cheaper to buy new than get turned and since I park it outside, they usually have a "nice" rust crust on the outer edge.

One less thing in the landfill, well they do get recycled, but that takes energy too.

Best,
Rutager
__________________
Rutager West

1977 911S Targa Chocolate Brown
Old 08-22-2017, 03:34 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #67 (permalink)
Registered
 
Join Date: Apr 2016
Posts: 1,176
Quote:
Originally Posted by cabmando View Post
Is that why there's a minimum thickness rating for rotors? Because they're supposed to be thrown away? Think about what you're saying before you say it.

Don't get me wrong here. I'm simply going to end the myth here that rotors are supposed to be tossed. It's a silly notion that is based on no real fact. If all four brakes are working properly, there's no reason you shouldn't turn rotors unless their is noticeable bluing of the rotor meaning they have gotten WAY too hot. Then, yes, you get rid of them because they have lost some of the tempering. Otherwise, turning a rotor does not make them any less safe or places like Oreilly's wouldn't do it nor would the shop that did mine.
There is a minimum thickness because when the rotor reaches that minimum, it is designed to be discarded. It's not a myth at all. If they are too thin, you THROW THEM. Not sure if you are arguing that fact.

Yours aren't too thin, however. They just aren't working the way you want them to.

Finally, back when Porsche made the rotors for your car, they were the only ones making them. If you wanted a replacement, they were probably $500 each from the dealer. Now, there are aftermarket rotors that cost next to nothing.

What year is your car?

Pelican has rotors for a 1983 for example, that are TWENTY TWO DOLLARS. That's right, 22 bucks for a rotor.

Pelican Parts - European Automotive Parts and Accessories - Porsche • BMW • Mercedes • Volkswagen • Audi • Saab • Volvo • MINI

Why would you ever fcuk around with turning them when they can be had for 22 bucks?

Just the bandwidth you wasted on this thread is worth 22 bucks alone.
Old 08-22-2017, 04:00 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #68 (permalink)
Functionista
 
manbridge 74's Avatar
 
Join Date: Jul 2011
Location: CO
Posts: 7,717
Quote:
Originally Posted by Nick Triesch View Post
The thing is there are a lot of rich guys on pelican. But most of us are not. Many of us have had old Porsche cars for years and we are not millionaires. There is no safety problem if rotors are within spec. The rotors you are driving on now are within spec. The bottom line is all the Porsche dealers and Porsche independents will not turn rotors because they make a lot more selling new ones. It is kind of like cheating the customer.
This is not true at Porsche. Gotta be at min thickness to replace or it can come back on the service dept in the way of bad review or unprofessionalism. Now if the customer wants replacement that's their prerogative. In my experience with OE Porsche brake components there is rarely ever a pulsation issue even after rotors are a way past min thickness.
__________________
Jeff
74 911, #3
I do not disbelieve in anything. I start from the premise that everything is true until proved false. Everything is possible.
Old 08-22-2017, 04:57 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #69 (permalink)
Brew Master
 
cabmandone's Avatar
 
Join Date: Jul 2013
Location: Delphos OH
Posts: 32,115
Garage
Quote:
Originally Posted by Catorce View Post
There is a minimum thickness because when the rotor reaches that minimum, it is designed to be discarded. It's not a myth at all. If they are too thin, you THROW THEM. Not sure if you are arguing that fact.

Yours aren't too thin, however. They just aren't working the way you want them to.

Finally, back when Porsche made the rotors for your car, they were the only ones making them. If you wanted a replacement, they were probably $500 each from the dealer. Now, there are aftermarket rotors that cost next to nothing.

What year is your car?

Pelican has rotors for a 1983 for example, that are TWENTY TWO DOLLARS. That's right, 22 bucks for a rotor.

Pelican Parts - European Automotive Parts and Accessories - Porsche • BMW • Mercedes • Volkswagen • Audi • Saab • Volvo • MINI

Why would you ever fcuk around with turning them when they can be had for 22 bucks?

Just the bandwidth you wasted on this thread is worth 22 bucks alone.
One thing is certain here. The amount of time you have spent arguing whether rotors should be turned or not on a thread that wasn't asking IF they should be turned but rather whether others had difficulty finding somewhere to turn them has been wasted.
Please... don't hesitate to move along now and stop wasting your time.
Old 08-22-2017, 05:25 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #70 (permalink)
83 911 Production Cab #10
 
JJ 911SC's Avatar
 
Join Date: Jun 2009
Location: Ottawa, Ontario, Canada
Posts: 11,134
Garage
Quote:
Originally Posted by cabmando View Post
... Please... don't hesitate to move along now and stop wasting your time.
Amen...
__________________
Who Will Live... Will See

83 911 Production Cab #10, Slightly Modified: Unslanted, 3.2, PMO EFI, TECgt, CE 911 CAM Sync / Pulley / Wires, SSI, Dansk Sport 2/2, 17" Euromeister, CKO GT3 Seats, Going SOK Super Charger
Old 08-22-2017, 05:27 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #71 (permalink)
Brew Master
 
cabmandone's Avatar
 
Join Date: Jul 2013
Location: Delphos OH
Posts: 32,115
Garage
Quote:
Originally Posted by rwest View Post
Cab,

When I first read the thread, I was solidly in the "just buy new ones camp." Now, you won me over, I think since rotors have become so cheap, most of us just replace, or we've run them so long that they couldn't be turned safe.

On the other hand is my DD Toyota which are probably cheaper to buy new than get turned and since I park it outside, they usually have a "nice" rust crust on the outer edge.

One less thing in the landfill, well they do get recycled, but that takes energy too.

Best,
Rutager
As long as your rotors are in spec and don't show any signs of drastic overheating or in the case of some cheaper made in China rotors you have rusting from the inside out, I wouldn't hesitate to get a set turned. The most important part is figuring out why the buildup or overheating occurred. I know in my case it happened a few years ago when I first got the car on the road and didn't take the time to really inspect the overall braking system other than to replace the fluid. I later found a few of my calipers had stuck pistons.
Old 08-22-2017, 05:29 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #72 (permalink)
 
Registered
 
Join Date: Oct 2012
Location: MA
Posts: 672
Garage
One more side thread for brake geeks
I asked if people thought the direction of rotor air scoops (in the middle of the rotor) mattered about a week ago on Cayenne forum (Early Cayenne Turbo's are HEAVY cars, big brakes) and I got a ton of opinions and learned more than I though I would.
https://rennlist.com/forums/porsche-cayenne-forum/1005857-rotors-does-l-r-side-really-matter.html
Old 08-23-2017, 06:32 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #73 (permalink)
Functionista
 
manbridge 74's Avatar
 
Join Date: Jul 2011
Location: CO
Posts: 7,717
Quote:
Originally Posted by reachme View Post
One more side thread for brake geeks
I asked if people thought the direction of rotor air scoops (in the middle of the rotor) mattered about a week ago on Cayenne forum (Early Cayenne Turbo's are HEAVY cars, big brakes) and I got a ton of opinions and learned more than I though I would.
https://rennlist.com/forums/porsche-cayenne-forum/1005857-rotors-does-l-r-side-really-matter.html
There is no "opinion" on this subject. Different part numbers left and right. The engineers at Porsche got this right.

__________________
Jeff
74 911, #3
I do not disbelieve in anything. I start from the premise that everything is true until proved false. Everything is possible.
Old 08-23-2017, 04:54 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #74 (permalink)
Reply


 


All times are GMT -8. The time now is 11:18 PM.


 
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2025, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2025 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page
 

DTO Garage Plus vBulletin Plugins by Drive Thru Online, Inc.