Brake rotor resurfacing
05-17-2014, 11:46 PM
#31
Rennlist Member
Thread Starter
How can you tell if they are too far gone before machining? You measure it first, then machine it until it is straight and has a good finish, then measure it again after. If it is above the min machine limit, then it is ok. How can a good tech visually "see that" before machining? Can we all see .010 " by eye?
I dont even bother machining them anymore for customers. Replace them while repairing the brakes or take the car elsewhere. It's not worth the hassle to try save a few dollars. The car will always come back with a pulsation.
In our CT shop, we charge .3 hour to machine a rotor ($24.00 each)
I dont even bother machining them anymore for customers. Replace them while repairing the brakes or take the car elsewhere. It's not worth the hassle to try save a few dollars. The car will always come back with a pulsation.
In our CT shop, we charge .3 hour to machine a rotor ($24.00 each)
05-18-2014, 06:40 AM
#32
Nordschleife Master
Join Date: Dec 2004
Location: Guelph, Ontario, Canada
Posts: 6,164
Likes: 0
Received 5 Likes
on
5 Posts
No they had a slight warp, but apparently it was worse than I thought. My issue is that they obviously noticed but kept on doing them regardless. They should have stopped and notified me that they were badly warped. Instead they did all 4 and told me they were badly warped after the fact, when I picked them up that's what the tech said. I then asked are they straight now and he said yes. As soon as I mounted them I could see the warp with my eye. Who knows what happened, they may have made them worse, they may have been too bad to machine. Bottom line they are just a bunch of monkeys.
I have ordered new rotors. And will get my money back.
I have ordered new rotors. And will get my money back.
How can you tell if they are too far gone before machining? You measure it first, then machine it until it is straight and has a good finish, then measure it again after. If it is above the min machine limit, then it is ok. How can a good tech visually "see that" before machining? Can we all see .010 " by eye?
I dont even bother machining them anymore for customers. Replace them while repairing the brakes or take the car elsewhere. It's not worth the hassle to try save a few dollars. The car will always come back with a pulsation.
In our CT shop, we charge .3 hour to machine a rotor ($24.00 each)
I dont even bother machining them anymore for customers. Replace them while repairing the brakes or take the car elsewhere. It's not worth the hassle to try save a few dollars. The car will always come back with a pulsation.
In our CT shop, we charge .3 hour to machine a rotor ($24.00 each)
They can't notice what they don't know....
05-20-2014, 01:10 PM
#33
Rennlist Member
Thread Starter
Well I have sent this video to the customer service team with a detailed note.
Perhaps I should have looked at them closer before I took them in. But what burns me is that they swear up and down they were machined to be straight. This is just $$$ over customer service. Any tech with half a brain would have stopped after one or two. Plus I have had 2 e-tests, a safety and had 4 tires installed at that same location this year. This is how they treat repeat customers.
And at a minimum they should have told me they were bad and I would not have spent the time putting them on the car.
Obviously they just machined them down to min spec and handed them back with no regard to them being warped. Or they really ****ed up or were out back smoking weed, or a combination. Ha Ha
Perhaps I should have looked at them closer before I took them in. But what burns me is that they swear up and down they were machined to be straight. This is just $$$ over customer service. Any tech with half a brain would have stopped after one or two. Plus I have had 2 e-tests, a safety and had 4 tires installed at that same location this year. This is how they treat repeat customers.
And at a minimum they should have told me they were bad and I would not have spent the time putting them on the car.
Obviously they just machined them down to min spec and handed them back with no regard to them being warped. Or they really ****ed up or were out back smoking weed, or a combination. Ha Ha
05-20-2014, 02:29 PM
#36
Team Owner
If they did not clean the mounting surface on the rotors where the lathe holding points contact, then the rotors can be turned but the hub centerline may not be true to the centerline of the disc pad face and will pulse the pads . I use an angle grinder with a wire cup brush to clean rust or dirt buildup on the hub part of the rotor both sides that attach to the lathe so it then has the original clean surfaces for mounting. Any build up at all on the lathe mounting points will turn the rotor's brake face off center. I am referring to the typical brake lathes used at most shops.
I am sure they are machined completely straight ... just not parallel with the hub mounting surface..
once you then mount against a hub the rotor is now " warped" I am sure a route cause investigation will reveal improper mounting of the rotor .
05-20-2014, 05:15 PM
#37
Rennlist Member
Thread Starter
And a quote from the service mangers response.
"The rotors machined with a true face, giving neither of the technicians any reason to condemn the rotors as not machine able. "
Absolute BS, as usual from CT service staff.
And they have not even asked to see the rotors or check them. They obviously trust the word of tech over a loyal (or past loyal) customer.
"The rotors machined with a true face, giving neither of the technicians any reason to condemn the rotors as not machine able. "
Absolute BS, as usual from CT service staff.
And they have not even asked to see the rotors or check them. They obviously trust the word of tech over a loyal (or past loyal) customer.
Last edited by Adamant1971; 05-20-2014 at 09:34 PM.
05-20-2014, 06:07 PM
#38
Captain Obvious
Super User
Super User
What about highschool drop out customer? The level of education isn't the issu here. How did they explqin that the rotors have a runout? If they made a full cut and the rotor was mounted properly then, ow do they explain the runout?
05-20-2014, 06:12 PM
#39
Rennlist Member
Thread Starter
I'm still waiting for corporate to respond.
05-20-2014, 07:15 PM
#40
Rennlist Member
Adamant1971: To prove your point first clean the hub face on your car then clean both rotor hub faces of rust, paint and/or dirt inside and out on the rotor you have in the video, now reattach the rotor to your car with lug nuts and washers if necessary for spacers and tighten the rotor to the hub and check again. I'm sure you will see the same result ie the axel hub face and the rotor hub face are now turning in one plane and the rotor brake pad faces are in another. This will verify the rotor was not on the brake lathe properly. Now you can take this cleaned rotor to CTC and have them mount it on their lathe ( which has now has the mounting points cleaned, right?). The rotor should turn on the lathe the same as in your video. It's obvious this rotor is toast, you should check the other three. Compensation >you should at least get your money back and possibly half the new cost on this one and any others that were ruined.
05-20-2014, 08:23 PM
#41
Instructor
Join Date: Feb 2007
Location: Nova Scotia
Posts: 117
Likes: 0
Received 0 Likes
on
0 Posts
Looks like the wrong adapters were used on the lathe.
Corp usually leaves it to the store to sort out problems.
As far as your high school drop out tech remark, I am a red seal technician and you might want to look into what is needed these days for training to be a technician and work on all types of cars!
Corp usually leaves it to the store to sort out problems.
As far as your high school drop out tech remark, I am a red seal technician and you might want to look into what is needed these days for training to be a technician and work on all types of cars!
05-20-2014, 08:32 PM
#42
Rennlist Member
Thread Starter
Looks like the wrong adapters were used on the lathe.
Corp usually leaves it to the store to sort out problems.
As far as your high school drop out tech remark, I am a red seal technician and we do not appreciate the remarks. The general public has no idea how much training and education is needed to be a auto tech these days, not just a hobby mechanic that does it in his garage on the weekends!
Corp usually leaves it to the store to sort out problems.
As far as your high school drop out tech remark, I am a red seal technician and we do not appreciate the remarks. The general public has no idea how much training and education is needed to be a auto tech these days, not just a hobby mechanic that does it in his garage on the weekends!
Real men own up to mistakes not dodge around them like they have been doing. It's just gets my blood boiling when people lie to your face or don't even pretend to listen.
05-21-2014, 11:07 AM
#43
6th Gear
Join Date: May 2014
Posts: 6
Likes: 0
Received 0 Likes
on
0 Posts
I tried for the first time Luk Schaffer brake rotors, and I must say they are amazing, especially for the price. I put them on my C4S 06, got Black XD Brake kit with premium carbon semi metallic pads. Braking is solid and crisp...will reo-order again
05-21-2014, 01:48 PM
#44
Does the hub face run out? Hard to tell in the video but it seems to be fine. If the hub face has no runout then CT mounted the rotors incorrectly. They should buy you new rotors...
This is a pretty cut and dry situation... you either machine them properly or you don't... Whether or not they had uneven transfer of friction material before has no impact on the way they are now.
For the record, rotors or brake discs don't warp... Pulsation mostly comes from thickness variation which is due to uneven transfer of friction material from the pads to the disc. This happens because of localized hotspotting...
If the tech is telling you they are warped, they don't know what they are talking about....!
This is a pretty cut and dry situation... you either machine them properly or you don't... Whether or not they had uneven transfer of friction material before has no impact on the way they are now.
For the record, rotors or brake discs don't warp... Pulsation mostly comes from thickness variation which is due to uneven transfer of friction material from the pads to the disc. This happens because of localized hotspotting...
If the tech is telling you they are warped, they don't know what they are talking about....!
05-21-2014, 04:07 PM
#45
Nordschleife Master
Join Date: Dec 2004
Location: Guelph, Ontario, Canada
Posts: 6,164
Likes: 0
Received 5 Likes
on
5 Posts
Without a doubt CT FVCKED up!. No if and or but. How far you want to take it is up to you. As to the red seal mechanic, I have seen so much ****ty work out there as to be incredible. Changing brakes out ,with new parts is easy. Just changing what needs to be changed NEVER happens at CT. I had a safety done once and they said I need new rotors, pads, calipers, all the way around at a cost of 2500.00. I asked how thin the rotors were. He said he didn't measure them. HE DIDN'T MEASURE IT! When I called your "red seal society" They said that maybe it was a issue for consumer and corporate affairs. I have little to no faith in that system.