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On-Car Brake Lathe #4720141
04/08/18 03:52 AM
04/08/18 03:52 AM
Joined: Aug 2004
Posts: 20,023
CA
The Critic Offline OP
The Critic  Offline OP
Joined: Aug 2004
Posts: 20,023
CA
2016 Acura RDX.

During a service visit late last year (at 44k miles) the front brakes were making a horrific screech despite plenty of material remaining. I found a service bulletin that was applicable to the condition (17-049) and after confirming the complaint, the dealer installed updated front brake pads and resurfaced the front rotors using an on-car brake lathe.

On-car brake lathes have always advertised being able to achieve <.001" of lateral runout every time. In my experience, cleaning the hub really well and installing premium rotors (and indexing, if possible) usually achieves .001"-.0015" in most cases, which is "ok."

The RDX was just here for regular maintenance (at 52k miles) and I decided to measure the lateral runout of the recently resurfaced front rotors. Each front rotor measured less than .0005". The less runout you have, the longer your brake job will last before developing DTV. I am not sure which brand of on-car lathe was used, but my guess is that it was a Pro-cut since that is the Honda approved unit.

This has really caused me to re-think how I should do brake jobs. We have two local service providers with on-car brake lathes and they charge between $80-$100 to machine rotors on-car. From the results that I saw, I think machining rotors on-car is really a better option than just hanging new rotors on the car and sending it out.

Last edited by The Critic; 04/08/18 04:00 AM.

2011 Toyota Prius - 173k - Various 0W-20 (Brew)
2007 Honda Accord 2.4 - 131K - Mobil 1 EP HM 5W-30
Re: On-Car Brake Lathe [Re: The Critic] #4720148
04/08/18 04:04 AM
04/08/18 04:04 AM
Joined: May 2005
Posts: 10,369
ROCHESTER, NY
Char Baby Offline
Char Baby  Offline
Joined: May 2005
Posts: 10,369
ROCHESTER, NY
$80-$100 each or for all 4?


"Retired"
-----------------------------------

'80 Firebird FORMULA V8/4bbl-purchased "NEW"
'15 Nissan Altima 2.5 SV
'15 Honda Civic LX
Re: On-Car Brake Lathe [Re: Char Baby] #4720156
04/08/18 04:19 AM
04/08/18 04:19 AM
Joined: Aug 2004
Posts: 20,023
CA
The Critic Offline OP
The Critic  Offline OP
Joined: Aug 2004
Posts: 20,023
CA
Originally Posted By: Char Baby
$80-$100 each or for all 4?

$80-100/pair axle.

Or I guess I can spend $10-12K and buy a new one for myself.


2011 Toyota Prius - 173k - Various 0W-20 (Brew)
2007 Honda Accord 2.4 - 131K - Mobil 1 EP HM 5W-30
Re: On-Car Brake Lathe [Re: The Critic] #4720163
04/08/18 04:47 AM
04/08/18 04:47 AM
Joined: May 2005
Posts: 10,369
ROCHESTER, NY
Char Baby Offline
Char Baby  Offline
Joined: May 2005
Posts: 10,369
ROCHESTER, NY
I've never had good success with turned rotors although I've never had them turned on the vehicle.
However, any rotor that I have had turned, only lasted about 6-8 months and then, I had to replace them anyway.

I did install some cheap DURAGO rotors from RockAuto on my wife's '01 Lexus RX300 AWD prior to selling the RX to her sister in 2015 and they're still going strong. So, for myself and my personal experience, I'd just install new rotors and call it a day.


"Retired"
-----------------------------------

'80 Firebird FORMULA V8/4bbl-purchased "NEW"
'15 Nissan Altima 2.5 SV
'15 Honda Civic LX
Re: On-Car Brake Lathe [Re: The Critic] #4720209
04/08/18 06:57 AM
04/08/18 06:57 AM
Joined: Nov 2006
Posts: 20,090
MA, Mittelfranken.de
Trav Offline
Trav  Offline
Joined: Nov 2006
Posts: 20,090
MA, Mittelfranken.de
On car brake lathes work great but so do off the car lathes. The most problems with off the car lathes are caused by the operator, not keeping the machine clean or using damaged parts on the machine.
The best lathe in the world will turn wobbly parts if its not set up properly, has damaged parts and not clean, not prepping the rotors will also effect the accuracy.
The on the vehicle unit removes these variables.


ASE L1, Master. Deutsch Meisterbrief.
Re: On-Car Brake Lathe [Re: The Critic] #4720321
04/08/18 09:04 AM
04/08/18 09:04 AM
Joined: Nov 2011
Posts: 4,882
MTL, CANADA
Rolla07 Offline
Rolla07  Offline
Joined: Nov 2011
Posts: 4,882
MTL, CANADA
I would only turn OEM rotors that are in good condition. I never had any issues just buying new and installing them as is. Do you get complaints about new rotors after they have been installed? How common is this run out issue on new untouched rotors? Ive never really checked run out on my rotors, just put them on and went.


2007 Corolla Red Pearl 155k miles
PP 0w20 & ST 4967

Re: On-Car Brake Lathe [Re: The Critic] #4720332
04/08/18 09:13 AM
04/08/18 09:13 AM
Joined: Jan 2017
Posts: 328
NJ
JLawrence08648 Offline
JLawrence08648  Offline
Joined: Jan 2017
Posts: 328
NJ
Hondas and Acuras are turned on the car because if you pull them you will ruin the bearing.

Re: On-Car Brake Lathe [Re: The Critic] #4720341
04/08/18 09:20 AM
04/08/18 09:20 AM
Joined: Jun 2016
Posts: 15
NJ
dpaldino Offline
dpaldino  Offline
Joined: Jun 2016
Posts: 15
NJ
A shop that I use occasionally turns the rotors on the car. The last time he did a 4 wheel brake job for me on a Honda CR-V, it cost over $900.00 and the only parts he used were the pads, which cost less than $75.00. About $825.00 in labor! Ever since, I've done my own brake jobs and just change the pads and rotors each time. Saves me money and I can't tell the difference in both feel and stopping power.


2017 Jeep Latitude 17,150 PP 5w-20,Mopar filter
2008 Honda CR-V 186,000 PP 5w-20,Fram Ultra 7317
2002 Honda CR-V 157,500 PP 5w-20,Fram Ultra 7317
Re: On-Car Brake Lathe [Re: The Critic] #4720376
04/08/18 10:03 AM
04/08/18 10:03 AM
Joined: Jun 2002
Posts: 6,374
MI
doitmyself Offline
doitmyself  Offline
Joined: Jun 2002
Posts: 6,374
MI
Is this a solution looking for a problem? Do Honda's have more sensitive brakes than other brands? I spend very little time in service garages, but I cannot recall ever seeing an on-car brake lathe being used. In fact, I don't recall ever seeing a tech. check runout and/or index a rotor.

I know there is the textbook method and then the method that almost everyone uses. I'm constantly reminded after I diy learn something on the net, and then the pros laugh at me and say nobody does that. Trav, what's the scoop in the your world of automotive repair regarding rotor mounting?

For me, I must be incredibly lucky or just have dumb luck with mounting rotors...knock on wood, LOL.

Re: On-Car Brake Lathe [Re: The Critic] #4720384
04/08/18 10:10 AM
04/08/18 10:10 AM
Joined: Jun 2004
Posts: 305
Valencia, CA
Richie Offline
Richie  Offline
Joined: Jun 2004
Posts: 305
Valencia, CA
My friend owns an independent Honda/Acura repair facility in the area and he use the on-car brake lathe.

Re: On-Car Brake Lathe [Re: Richie] #4720394
04/08/18 10:26 AM
04/08/18 10:26 AM
Joined: Sep 2010
Posts: 7,078
Texas
4WD Offline
4WD  Offline
Joined: Sep 2010
Posts: 7,078
Texas
Im normally a DIY but found the rotors on my Canyon too much for my tools and had a shop change them
(You pull out the entire sub assembly to change them)
That might be a case for a skim in place job but EBC pads really chewed up factory rotors.

14 months in my Callahan rotors and PowerStop pads have been a great upgrade

Re: On-Car Brake Lathe [Re: JLawrence08648] #4720498
04/08/18 11:57 AM
04/08/18 11:57 AM
Joined: Aug 2002
Posts: 411
USA
thrace Offline
thrace  Offline
Joined: Aug 2002
Posts: 411
USA
Originally Posted By: JLawrence08648
Hondas and Acuras are turned on the car because if you pull them you will ruin the bearing.
I took this to mean removing brake rotors. Please explain. Maybe I am not understanding. As for front rotors, Honda front rotors are secured with screws. If screw is removed, rotor can be removed easily by hand with no forcing. No damage to anything. Maybe you meant to say something other than removing front rotors.

Re: On-Car Brake Lathe [Re: thrace] #4720618
04/08/18 02:34 PM
04/08/18 02:34 PM
Joined: Jun 2005
Posts: 11,403
Santa Barbara, CA
bdcardinal Online content
bdcardinal  Online Content
Joined: Jun 2005
Posts: 11,403
Santa Barbara, CA
Originally Posted By: thrace
Originally Posted By: JLawrence08648
Hondas and Acuras are turned on the car because if you pull them you will ruin the bearing.
I took this to mean removing brake rotors. Please explain. Maybe I am not understanding. As for front rotors, Honda front rotors are secured with screws. If screw is removed, rotor can be removed easily by hand with no forcing. No damage to anything. Maybe you meant to say something other than removing front rotors.


Some of the older ones, think 90s Accords, you either had to press them out or use a slide hammer. Eventually Matco made a tool to remove them really fast.


2014 Ford Mustang GT Track Pack
1995 Ford Mustang GT

Ford/Mazda Parts Counter
NRA Benefactor Member
Opinions expressed are my own.
Re: On-Car Brake Lathe [Re: thrace] #4721080
04/08/18 11:46 PM
04/08/18 11:46 PM
Joined: Jan 2004
Posts: 4,243
California
nthach Offline
nthach  Offline
Joined: Jan 2004
Posts: 4,243
California
Originally Posted By: thrace
Originally Posted By: JLawrence08648
Hondas and Acuras are turned on the car because if you pull them you will ruin the bearing.
I took this to mean removing brake rotors. Please explain. Maybe I am not understanding. As for front rotors, Honda front rotors are secured with screws. If screw is removed, rotor can be removed easily by hand with no forcing. No damage to anything. Maybe you meant to say something other than removing front rotors.

Honda and strangely enough, Lexus uses screws to secure their rotors. I presume it's to keep the rotors fixed on the hub and to help index the rotor to hub, but the oddity with Lexus is that regular Toyotas don't use screws to keep the rotors on.

Re: On-Car Brake Lathe [Re: The Critic] #4721111
04/09/18 01:42 AM
04/09/18 01:42 AM
Joined: Jul 2003
Posts: 4,811
New Zealand
Silk Offline
Silk  Offline
Joined: Jul 2003
Posts: 4,811
New Zealand
Captive rotors went away a long time ago. Not worth going there, if it needs rotors, sell the car.


1987 BMW R65 - Penrite V Twin 20/50
2005 Nissan Expert - Gulf Western 10W-40
1996 Volvo T5 - Penrite HPR15 - 15W-60. Ryco syntec filter.

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