Resurface Rotors
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01-02-2014, 07:40 PM
#18
Rennlist Member
You remove meat and heat dispersing ability when you grind rotors. If the car is driven hard, it could compromise brakes by allowing them to get hotter than they should.
It takes a pretty darned good braking system and turns it in only X% of a pretty darned good braking system.
It takes a pretty darned good braking system and turns it in only X% of a pretty darned good braking system.
01-02-2014, 07:52 PM
#19
Rennlist Member
You remove meat and heat dispersing ability when you grind rotors. If the car is driven hard, it could compromise brakes by allowing them to get hotter than they should.
It takes a pretty darned good braking system and turns it in only X% of a pretty darned good braking system.
It takes a pretty darned good braking system and turns it in only X% of a pretty darned good braking system.
01-02-2014, 08:16 PM
#20
Rennlist Member
But you turn them, and lose more mass than you would in wear. New rotors last a long time-if they are good ones. Except perhaps, with a lot of track work. Then, it is MOST SURELY a no-no turning rotors-one has to suck it up and spend the money on consumables.
01-02-2014, 08:18 PM
#21
Rennlist Member
$7 to turn a rotor?? I use a very good but value-based Porsche mechanic, and I would be shocked if he turned them for that price.
How much are front Porsche rotors now? $130 each? They were $105 from Sunset a few years ago and that was an absolute bargain in the Land O'Porsche. Moreover, 993 front rotors will last a pile of miles before they need to be replaced. The price of $260 doesn't seem bad at all, especially when a track junkie will buy them for $40-$50 per pair at the local seedy motel.
How much are front Porsche rotors now? $130 each? They were $105 from Sunset a few years ago and that was an absolute bargain in the Land O'Porsche. Moreover, 993 front rotors will last a pile of miles before they need to be replaced. The price of $260 doesn't seem bad at all, especially when a track junkie will buy them for $40-$50 per pair at the local seedy motel.
01-02-2014, 08:19 PM
#22
Race Car
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It's just "one of those things"! Even my old fleet of Sprinter vans had throwaway rotors. You should have seen how soft they were. The pads would groove them up so bad that they looked like 45's. They never had brake vibes. Even old Volvos had throwaways. Neither of these were grooved or slotted but the example I'm making is in the materials...
01-02-2014, 09:21 PM
#23
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$7 to turn a rotor?? I use a very good but value-based Porsche mechanic, and I would be shocked if he turned them for that price.
How much are front Porsche rotors now? $130 each? They were $105 from Sunset a few years ago and that was an absolute bargain in the Land O'Porsche. Moreover, 993 front rotors will last a pile of miles before they need to be replaced. The price of $260 doesn't seem bad at all, especially when a track junkie will buy them for $40-$50 per pair at the local seedy motel.
How much are front Porsche rotors now? $130 each? They were $105 from Sunset a few years ago and that was an absolute bargain in the Land O'Porsche. Moreover, 993 front rotors will last a pile of miles before they need to be replaced. The price of $260 doesn't seem bad at all, especially when a track junkie will buy them for $40-$50 per pair at the local seedy motel.
01-02-2014, 09:55 PM
#24
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My experience 0n a 1996 Carrera ; Stock pads + spiders = little squeal, no spider = lots of squeal Never had luck with any aftermarket pads not squealing. Also as my rotors approached minimum thickness limit the brakes became a lot nosier, replaced rotors with existing pads quieted right down. anecdotal stuff.
Mike
01-02-2014, 10:16 PM
#25
Rennlist Member
01-02-2014, 10:47 PM
#26
Three Wheelin'
The spiders are round disks with a little metal pressure clip on the back. The pressure clip looks kind of like the legs of a spider. The clip inserts into the caliper piston and the disk can be/is stuck to the pad backer with wurth spray. By creating a connection between the pad and the caliper piston, pad vibration is minimized. Pad vibration is the squeal you hear.
Most people remove the spiders for track time, it makes pad changes easier and nobody cares if your brakes squeal on the track.
Most people remove the spiders for track time, it makes pad changes easier and nobody cares if your brakes squeal on the track.
01-02-2014, 11:02 PM
#27
Rennlist Member
Hi!
I have brakes that are around 80% but the only problem is the previous owner glazed my disks slightly and they squeak. Is it worth having the disks lightly re-surfaced and installing new OEM pads? If not I will just wait out the brakes a while and replace everything.
I have brakes that are around 80% but the only problem is the previous owner glazed my disks slightly and they squeak. Is it worth having the disks lightly re-surfaced and installing new OEM pads? If not I will just wait out the brakes a while and replace everything.
It is. I recently bought 4 rotors and oem pads from sunset, 550ish rotors 270ish pads. You need new front caliper bolts (recommended) and if you do the spiders, with shipping theres not much change.
Has anyone tried the ProCut brake lathe?
Interesting - I did mine all new oem, no spiders, zero squeal. Maybe I got lucky!
01-02-2014, 11:42 PM
#28
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01-02-2014, 11:50 PM
#29
You remove meat and heat dispersing ability when you grind rotors. If the car is driven hard, it could compromise brakes by allowing them to get hotter than they should.
It takes a pretty darned good braking system and turns it in only X% of a pretty darned good braking system.
It takes a pretty darned good braking system and turns it in only X% of a pretty darned good braking system.
n
1. foolish talk; nonsense
Please keep up-I noted this in post 7.
Of course Ed is right theoritically...
However if the Porsche engineers have quoted min allowable thicknesses as stated in the workshop manual, then they have done the math to determine that the reduction in thickness (not under stated specification) is NOT appreciable to the overall performance of the braking system.
Porsche engineering, especially something as critical as a braking system, is over designed by a margin of x that allows for turning of the rotors.
Ed, and anyone who knows anything about engineering, knows and understands this...
The rest is simply lunch meat...
$7 to turn a rotor?? I use a very good but value-based Porsche mechanic, and I would be shocked if he turned them for that price.
I'm jus sayin...
Last edited by nine9six; 01-03-2014 at 12:24 AM.
01-03-2014, 11:05 AM
#30
Rennlist Member
Paul, let's not get too enamored with Porsche engineers......do we need to start the list again?
Personally, for a car that can be driven in anger, and only sees so many miles a year-I'll stick with "full meat" rotors, instead of a resurface. I've done enough track days in the past, that is goes against my will to not do everything humanly possible to avoid a soft brake pedal.
Amortized, a full brake refresh isn't very expensive on an annual basis.
Personally, for a car that can be driven in anger, and only sees so many miles a year-I'll stick with "full meat" rotors, instead of a resurface. I've done enough track days in the past, that is goes against my will to not do everything humanly possible to avoid a soft brake pedal.
Amortized, a full brake refresh isn't very expensive on an annual basis.
baloney (bəˈləʊnɪ) or boloney
n
1. foolish talk; nonsense
Easy there Ed...
Of course Ed is right theoritically...
However if the Porsche engineers have quoted min allowable thicknesses as stated in the workshop manual, then they have done the math to determine that the reduction in thickness (not under stated specification) is NOT appreciable to the overall performance of the braking system.
Porsche engineering, especially something as critical as a braking system, is over designed by a margin of x that allows for turning of the rotors.
Ed, and anyone who knows anything about engineering, knows and understands this...
The rest is simply lunch meat...
Not trying to shock you Mark, just stating a fact...Is the rest of the Porsche world to understand if you cant get a service peformed for the price I paid; then it must not exist?
I'm jus sayin...
n
1. foolish talk; nonsense
Easy there Ed...
Of course Ed is right theoritically...
However if the Porsche engineers have quoted min allowable thicknesses as stated in the workshop manual, then they have done the math to determine that the reduction in thickness (not under stated specification) is NOT appreciable to the overall performance of the braking system.
Porsche engineering, especially something as critical as a braking system, is over designed by a margin of x that allows for turning of the rotors.
Ed, and anyone who knows anything about engineering, knows and understands this...
The rest is simply lunch meat...
Not trying to shock you Mark, just stating a fact...Is the rest of the Porsche world to understand if you cant get a service peformed for the price I paid; then it must not exist?
I'm jus sayin...