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Anybody what do turned rotors look like?
Question:
well, after consulting with a fairly well known tool and die expert in my area, i was informed about a couple of things… 1) the machine shop runs rotors thru there like no-bodys business….. if the blades are dull, and the revolution for the turning chuck is in accurate… there will be phases of irregular grove stamps caused by the lifting and re seating of the blade… you will notice that new rotors do not have any of this grip design embedded , yet they role right off the assembly line…. theres no reason why your mechanic should feel like learning pottery sculpturing on your rotors… 2) there is a way to embed grab tracks into a rotor… this is used only if your using an extremly hard pad assembly…… your not… or at least you should not be…. good luck
Response:
Listen to Sam. His answer is correct. John – Hide quoted text — Show quoted text – >when rotors are turned they are cut in a circular fashion the bit used is not >going to give a perfect cut which will leave very small lines. A good brake >shop will swirl the rotor by using a orbital sander and a sanding disk (not >really a sanding disk, but something similar) and sand swirl marks into the >rotors, they put these in there so that until the rotor gets warn in a little >the lines are not going the same direction as the rotor turns. eventually the >rotors will wear in and the lines will disapear (since braking uses friction >which eventually wears down the metal as well as the pad, but not as much) >and >it will look almost glassy. when a new rotor is put on a car they usually >have >these swirl marks, they just aren’t as noticable since they probably use a >different method than most brake shops and by the time you look they are >usually gone. Hope this answered any questions. >– > Sam > Hi everybody, this week I had my front rotors turned and front brake > pads replaced at a dealer in Cambridge, MA on my 95 Prelude Si. When I > looked at the freshly turned rotors, I noticed that they left many tiny > grooves on the rotors, and so the rotors do not look like shiny mirrors > like in other cars and they also don’t feel totally smooth. These > grooves were not there before they were turned, I had them turned > because my steering wheel vibrated when I braked. Now the vibration is > gone though. If I run my nail accross the rotors surface I can feel the > small grooves that were made after turning them. Is this normal after > having rotors turned, or should they look and feel as smooth as when > they were new? The dealer says that it has those grooves so the brake > pads can "bite" into the rotors, so then why don’t new rotors have the > same grooves? Did I get ripped off or what? Please help, anybody who > has had their rotors turned! Thanks in advance, Randall.
Response:
smooth as glass usually means they are burned, they should have small swirl paterns, or what looks like a crosshatch patern. Smooth as glass or blue usually means they are burned, and the integrity of the metal is gone. — Sam – Hide quoted text — Show quoted text -> They should be smooth as glass if done properly. > — > Roger > Orlando, FL >Hi everybody, this week I had my front rotors turned and front brake >pads replaced at a dealer in Cambridge, MA on my 95 Prelude Si. When I >looked at the freshly turned rotors, I noticed that they left many tiny >grooves on the rotors, and so the rotors do not look like shiny mirrors >like in other cars and they also don’t feel totally smooth. These >grooves were not there before they were turned, I had them turned >because my steering wheel vibrated when I braked. Now the vibration is >gone though. If I run my nail accross the rotors surface I can feel the >small grooves that were made after turning them. Is this normal after >having rotors turned, or should they look and feel as smooth as when >they were new? The dealer says that it has those grooves so the brake >pads can "bite" into the rotors, so then why don’t new rotors have the >same grooves? Did I get ripped off or what? Please help, anybody who >has had their rotors turned! Thanks in advance, Randall.
Response:
when rotors are turned they are cut in a circular fashion the bit used is not going to give a perfect cut which will leave very small lines. A good brake shop will swirl the rotor by using a orbital sander and a sanding disk (not really a sanding disk, but something similar) and sand swirl marks into the rotors, they put these in there so that until the rotor gets warn in a little the lines are not going the same direction as the rotor turns. eventually the rotors will wear in and the lines will disapear (since braking uses friction which eventually wears down the metal as well as the pad, but not as much) and it will look almost glassy. when a new rotor is put on a car they usually have these swirl marks, they just aren’t as noticable since they probably use a different method than most brake shops and by the time you look they are usually gone. Hope this answered any questions. — Sam – Hide quoted text — Show quoted text -> Hi everybody, this week I had my front rotors turned and front brake > pads replaced at a dealer in Cambridge, MA on my 95 Prelude Si. When I > looked at the freshly turned rotors, I noticed that they left many tiny > grooves on the rotors, and so the rotors do not look like shiny mirrors > like in other cars and they also don’t feel totally smooth. These > grooves were not there before they were turned, I had them turned > because my steering wheel vibrated when I braked. Now the vibration is > gone though. If I run my nail accross the rotors surface I can feel the > small grooves that were made after turning them. Is this normal after > having rotors turned, or should they look and feel as smooth as when > they were new? The dealer says that it has those grooves so the brake > pads can "bite" into the rotors, so then why don’t new rotors have the > same grooves? Did I get ripped off or what? Please help, anybody who > has had their rotors turned! Thanks in advance, Randall.
Response:
- Hide quoted text — Show quoted text ->Hi everybody, this week I had my front rotors turned and front brake >pads replaced at a dealer in Cambridge, MA on my 95 Prelude Si. When I >looked at the freshly turned rotors, I noticed that they left many tiny >grooves on the rotors, and so the rotors do not look like shiny mirrors >like in other cars and they also don’t feel totally smooth. These >grooves were not there before they were turned, I had them turned >because my steering wheel vibrated when I braked. Now the vibration is >gone though. If I run my nail accross the rotors surface I can feel the >small grooves that were made after turning them. Is this normal after >having rotors turned, or should they look and feel as smooth as when >they were new? The dealer says that it has those grooves so the brake >pads can "bite" into the rotors, so then why don’t new rotors have the >same grooves? Did I get ripped off or what? Please help, anybody who >has had their rotors turned! Thanks in advance, Randall.
The dealer is right about the grooves for pads to "bite", but these grooves must not be circular, but rather diagonal so that pads go acros them not along. Gennady
Response:
The grooves are there to seat the new pads to the rotor. It is normal Greg hondaino.com – Hide quoted text — Show quoted text – >Hi everybody, this week I had my front rotors turned and front brake >pads replaced at a dealer in Cambridge, MA on my 95 Prelude Si. When I >looked at the freshly turned rotors, I noticed that they left many tiny >grooves on the rotors, and so the rotors do not look like shiny mirrors >like in other cars and they also don’t feel totally smooth. These >grooves were not there before they were turned, I had them turned >because my steering wheel vibrated when I braked. Now the vibration is >gone though. If I run my nail accross the rotors surface I can feel the >small grooves that were made after turning them. Is this normal after >having rotors turned, or should they look and feel as smooth as when >they were new? The dealer says that it has those grooves so the brake >pads can "bite" into the rotors, so then why don’t new rotors have the >same grooves? Did I get ripped off or what? Please help, anybody who >has had their rotors turned! Thanks in advance, Randall.
Response:
it is normal , and possibly wrong at the same time as they are cut the bit moves across the face of the rotor while the rotor turns, if the feed rate is to fast or the bit to dull it will leave ridges. the surface should be fairly smooth after turning. But after turning the pad manufacturers recomend putting a crosshatch, non directional, finish on them to avoid grooving the new pads and to allow them to seat in properly. If this is not done and they are " smooth as glass" there is a good possibility of glazeing the pads. corey – Hide quoted text — Show quoted text ->looked at the freshly turned rotors, I noticed that they left many tiny >grooves on the rotors, and so the rotors do not look like shiny mirrors >like in other cars and they also don’t feel totally smooth. These >grooves were not there before they were turned, I had them turned >because my steering wheel vibrated when I braked. Now the vibration is >gone though. If I run my nail accross the rotors surface I can feel the >small grooves that were made after turning them. Is this normal after >having rotors turned, or should they look and feel as smooth as when >they were new?
Response:
>Hi everybody, this week I had my front rotors turned and front brake >pads replaced at a dealer in Cambridge, MA on my 95 Prelude Si. When I >looked at the freshly turned rotors, I noticed that they left many tiny >grooves on the rotors, and so the rotors do not look like shiny mirrors >like in other cars and they also don’t feel totally smooth. These >grooves were not there before they were turned, I had them turned >because my steering wheel vibrated when I braked. Now the vibration is >gone though. If I run my nail accross the rotors surface I can feel the >small grooves that were made after turning them. Is this normal after >having rotors turned, or should they look and feel as smooth as when >they were new? The dealer says that it has those grooves so the brake >pads can "bite" into the rotors, so then why don’t new rotors have the >same grooves? Did I get ripped off or what? Please help, anybody who >has had their rotors turned! Thanks in advance, Randall.
Smooth as glass. Having grooves in the rotors wear the pads down faster. Go back, hit them over the head with the rotor. Tell them the lathe needs it’s bit sharpened. -Don — ‘Anything but late for supper.’| Two weeks later, I got: ‘It’s NOT my FAULT!’ | "To be or not to grqvvvqaskl" I need more time. I need more monkeys.
Response:
Hi everybody, this week I had my front rotors turned and front brake pads replaced at a dealer in Cambridge, MA on my 95 Prelude Si. When I looked at the freshly turned rotors, I noticed that they left many tiny grooves on the rotors, and so the rotors do not look like shiny mirrors like in other cars and they also don’t feel totally smooth. These grooves were not there before they were turned, I had them turned because my steering wheel vibrated when I braked. Now the vibration is gone though. If I run my nail accross the rotors surface I can feel the small grooves that were made after turning them. Is this normal after having rotors turned, or should they look and feel as smooth as when they were new? The dealer says that it has those grooves so the brake pads can "bite" into the rotors, so then why don’t new rotors have the same grooves? Did I get ripped off or what? Please help, anybody who has had their rotors turned! Thanks in advance, Randall.
Response:
They should be smooth as glass if done properly. — Roger Orlando, FL – Hide quoted text — Show quoted text – >Hi everybody, this week I had my front rotors turned and front brake >pads replaced at a dealer in Cambridge, MA on my 95 Prelude Si. When I >looked at the freshly turned rotors, I noticed that they left many tiny >grooves on the rotors, and so the rotors do not look like shiny mirrors >like in other cars and they also don’t feel totally smooth. These >grooves were not there before they were turned, I had them turned >because my steering wheel vibrated when I braked. Now the vibration is >gone though. If I run my nail accross the rotors surface I can feel the >small grooves that were made after turning them. Is this normal after >having rotors turned, or should they look and feel as smooth as when >they were new? The dealer says that it has those grooves so the brake >pads can "bite" into the rotors, so then why don’t new rotors have the >same grooves? Did I get ripped off or what? Please help, anybody who >has had their rotors turned! Thanks in advance, Randall.