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  #31  
Old 10-30-2007, 05:43 PM
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Quote:
Originally Posted by Hatterasguy View Post
Thats because your rotors are shot. I can nail my brakes at 100 and they are smooth. Sliding calipers are cheap junk.
Same here, mine actually make a really neat "roaring" (sounds like jake-braking but with a lot less volume) sound if I slow down hard above 65mph....they are the ATE-power discs, so they have the groove pattern cut into them, and the hot gases on the rotor surface escape through those channels, making the roaring sound. They don't fade either, they rock! (well, I haven't been able to make them fade) Next time I am going to go with the cross drilled ones though, my dad has them on his SD and they are phenomenal when paired with PBR Organic Deluxe pads. Also, no brake dust, as the pads are not black like the OEM ones.

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  #32  
Old 10-30-2007, 06:10 PM
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The main reason why not to turn MB rotors is because they are made to be as thin as possible to save weight.. The rule of thumb is to change them every other brake change..
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  #33  
Old 10-30-2007, 06:37 PM
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Originally Posted by pawoSD View Post
Next time I am going to go with the cross drilled ones though, my dad has them on his SD and they are phenomenal when paired with PBR Organic Deluxe pads. Also, no brake dust, as the pads are not black like the OEM ones.
Where did your dad get 'em?
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  #34  
Old 10-30-2007, 06:45 PM
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Originally Posted by Shawn D. View Post
Controlled by a shop that does cryogenic processing. Here's just one site on the subject: http://www.metal-wear.com/


The supposed "softness" of MB rotors is hearsay, IMO. Where's a credible source for such a claim? It's not really hardening anyhow, but rearranging the crystal structure.


This is not something you can do at home.
Thanks for the link, I bookmarked it, and will look into it. Sounds like overkill, but you never know.
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  #35  
Old 10-30-2007, 08:34 PM
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Originally Posted by drskipper View Post
YOU ARE EXACTLY RIGHT DO NOT TURN OEM MERCEDES ROTORs THEY ARE A SOFTER METAL AND YOU WILL WEAKEN THEM.
Please explain how resurfacing a rotor weakens it any more than normal wear. If a rotor exceeds the minimum specified thickness, why would it matter whether it was worn down or resurfaced to its current dimensions? Is a rotor that has been worn to a certain thickness stronger than a rotor that has been machined to an identical thickness?

And what exactly is an "OEM Mercedes rotor?" If it's a Mercedes rotor, it's not OEM. And if it's OEM it's not Mercedes.
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  #36  
Old 10-30-2007, 10:06 PM
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Would a OEM rotor be what MB installed from the factory when the car was new? ATE, or Bendix. or maybe a cing chang from Bang yang, China ?
It should have the little star stamped on it though .

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  #37  
Old 10-30-2007, 10:25 PM
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Ummm, "resurfacing" on lathe is bogus repair whereas grooved rotors aint serious prob when pads last couple years anyhow. Meanwhile those attempting to recut warped rotors oughta be shot.

Bottom line: Factory spec rotor surfaces = better longevity than any machinist can hope to accomplish on lathe. And WTF, new rotors cost less than $50 so what's the point?

Otherwise all this BS of "recutting" rotors derives from chain-store logic of Les Schwabb and other meat'n potato brake shops operating on Chevy specs.

Cheap brake repair?? All ye need is fresh pads and rotors that aint warped. Otherwise there's millions of mechanics eager to sell $1000 brake jobs to accomodate insecure and squeemish car owners.

And everybody on this forum oughta be changing their own pads!! Damnit haint nothin easier than pulling wheel and knockin in new disc pads. Discs themselves oughta be replace ONLY when warped says me. And when factory discs warp it means sloppy driving habbits riding the brakes anyhow. Gotta always feather and peddle the brakes on these old diesels. Nobody needs be riding them all the time.
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  #38  
Old 10-30-2007, 10:36 PM
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Originally Posted by charmalu View Post
Would a OEM rotor be what MB installed from the factory when the car was new?
Parts installed by the factory are OE, not OEM.

Quote:
Originally Posted by charmalu View Post
It should have the little star stamped on it though .
OEM parts should not have the star stamped thereon. Only OE parts should be marked with the star.
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  #39  
Old 10-30-2007, 10:42 PM
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Originally Posted by DieselDog View Post
Meanwhile those attempting to recut warped rotors oughta be shot.
Along those peddling unevaluated hearsay as fact!!!

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Originally Posted by DieselDog View Post
Discs themselves oughta be replace ONLY when warped says me.
Hopefully everyone else will have the good sense to heed the minimum thickness specifications.

Quote:
Originally Posted by DieselDog View Post
Bottom line: Factory spec rotor surfaces = better longevity than any machinist can hope to accomplish on lathe.
It doesn't take a genius to understand that a new rotor should last longer than a used one of similar quality. The point is not to make a used rotor last longer than a new one would. The objective is to get additional service from the used rotor.

Last edited by tangofox007; 10-30-2007 at 10:48 PM.
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  #40  
Old 10-30-2007, 11:14 PM
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Originally Posted by toomany MBZ View Post
Where did your dad get 'em?
Fastlane sells them. I have a set of X drilled on the rear, and a set will be going on the front this winter. Along with stainless brake lines and painted calipers. They will look almost as good as the sexy calipers on new MB's. Minues the eight pistons and massive rotors of course.



Wish I could put these on my car, but I would need to run 18's or 19's for them to clear. My W126 would be able to pull a few G's under braking though. The new carbon-ceramic brakes will suck the eye balls out of your skull at full lock.
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Last edited by Hatterasguy; 10-30-2007 at 11:23 PM.
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  #41  
Old 10-31-2007, 12:18 AM
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fact is this .. new rotors and pads can be had for cheap .. turning a rotor is approx 10-15 bucks per rotor .. new rotors can be had for 25 .. on diff models where rotors are 50-100 and a bad brake job was done id turn em .. otherwise 20 bucks to have new isnt shizzle my nizzle


case closed ..

Last edited by xtreme barton; 10-31-2007 at 12:29 AM.
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  #42  
Old 10-31-2007, 12:25 AM
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Originally Posted by Hatterasguy View Post
Fastlane sells them. I have a set of X drilled on the rear, and a set will be going on the front this winter. Along with stainless brake lines and painted calipers. They will look almost as good as the sexy calipers on new MB's. Minues the eight pistons and massive rotors of course.



Wish I could put these on my car, but I would need to run 18's or 19's for them to clear. My W126 would be able to pull a few G's under braking though. The new carbon-ceramic brakes will suck the eye balls out of your skull at full lock.
Thanks, that set up looks pretty good, but I'll sick with a stock size. These cars have rather good brakes.
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  #43  
Old 10-31-2007, 12:35 AM
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The "case" will never be closed, opinions will be as varied as the snowflakes... my father is convinced the only time to change a rotor is when it warps. he thinks so little of brakes, that the pads need to be changed when the pads grind steel to steel, and the "grooves" that occur from the pad rivits grinding into them, gives them MORE surface area, so better stopping power... he may be technically correct, but smooth rotors and fresh pads are designed that way for a reason... if "grooved" rotors were better, then race cars wouldn't drill holes and cut slots... grooves hold heat, and compressed gas, plus they weaken the rotor and cut down on heat transferr ability... a slight increase of surface area will not make up for that.
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  #44  
Old 10-31-2007, 10:35 AM
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Quote:
Originally Posted by xtreme barton View Post
.. otherwise 20 bucks to have new isnt shizzle my nizzle

If you are going to argue your case with numbers, you could at least do the arithmetic right. $20 might not be shizzle, but it's also not the correct figure.
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  #45  
Old 10-31-2007, 03:48 PM
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Originally Posted by vstech View Post
my father...... he thinks so little of brakes
An excellent story he'd enjoy: 1960's Austin Healey 3000 was helacious sports car. Everybody else went to disc brakes, Austin Healey 3000 had huge 13" drums on all four wheels. When journalist whined about bad brakes Donald Healey was quoted as saying: "good brakes do NOT encourage good driving habbits."

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