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Budgie
New User
May 20, 2009, 4:52 PM
Post #1 of 8
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Machining Brake Rotors
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Hi All,
I just had my front brake pads replaced, as they were down to the minimum thickness and squeaking. Both front rotors were measured at .962, and their discard thickness is .910, so I chose to have them machined. I just looked at my invoice and noticed that they machined them to the discard thickness of .910. Is this this something I should gripe about?
I know that some will say I should have just gotten them replaced and others that would have also resurfaced, but I mainly want to know if I am driving an unsafe car now and if the mechanic should rectify the situation?
Thanks!
Budgie 
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Hammer Time
Ultimate Carjunky
/ Moderator
May 20, 2009, 4:58 PM
Post #2 of 8
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Re: Machining Brake Rotors
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I somewhat doubt they machined them to specifically the measurement. They were most likely just noting the spec for some reason.
Those rotors would have to have been real bad to have taken that much off. If you had a pulsation to start with, then you will likely get it again real soon.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Loren Champlain Sr
Veteran
/ Moderator
May 20, 2009, 5:08 PM
Post #3 of 8
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Re: Machining Brake Rotors
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Budgie; I would agree that you should have had them replaced. The thinner the rotors become, the more susceptible
to warpage . Also, the rotors aren't able to dissipate the heat, the thinner they become. Under severe circumstances, heat can cause the brake fluid to boil, which will cause air bubbles in the fluid. Air is not compressible, and loss of braking can result. Heat is also the cause of brake rotor warpage. If this occurs, the rotors will have to be replaced. No ones fault. Brakes are not something to 'skimp' on. Rotors are relatively inexpensive. Doesn't matter how good your car looks or how good it runs. It's got to be able to STOP. Replace the rotors.
Loren
SW Washington
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Budgie
New User
May 20, 2009, 5:12 PM
Post #4 of 8
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Re: Machining Brake Rotors
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Thanks for your input. That makes me feel a bit better. I just took a second look at the invoice and, now that I think of it, they were likely just stating specifications. Here is the wording exactly:
"Thickness = .962"
"Machine to = .910"
"Discard at = .910"
So, "Machine to" can also be interpreted as "do not machine less than this thickness"?
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Hammer Time
Ultimate Carjunky
/ Moderator
May 20, 2009, 5:17 PM
Post #5 of 8
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Re: Machining Brake Rotors
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No, there is a spec called "machine to" and another called discard. In this case they are the same so yes, it was just the specs.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Loren Champlain Sr
Veteran
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May 20, 2009, 5:23 PM
Post #6 of 8
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Re: Machining Brake Rotors
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LOL. Sorry to butt in, Hammer. You and I must've been typing at the same time. You are evidently faster.
Loren
SW Washington
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Hammer Time
Ultimate Carjunky
/ Moderator
May 20, 2009, 5:25 PM
Post #7 of 8
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Re: Machining Brake Rotors
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No Problem Loren
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Budgie
New User
May 20, 2009, 5:50 PM
Post #8 of 8
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Re: Machining Brake Rotors
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Thanks to you both! I'm going to stick with them until the next pad replacement and just watch for problems in the mean time.
Now, I just need new tires. 
Budgie 
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