Disc (Rotor) Minimum Thickness is determined by the motor vehicle manufacturer during initial vehicle design. Most of the time it is stamped on the rotor itself. Some states have rules on what they consider the minimum safe thickness. Look on the rotor.
19mm
The minimum brake rotor thickness for the front and back rotors on a 1992 Honda Accord is 21mm. Rotors which are below this thickness will not offer adequate or reliable braking.
The minimum thickness or a front brake rotor to be turned is one quarter of an inch. If the brake rotor is less than a quarter of eight inch. It must be discarded.
It is the safe and legal minimum thickness allowed for a brake rotor.
The 2001 Pontiac Grand Am minimum brake rotor thickness is .075. The minimum brake rotor thickness is a standard minimum. Certified mechanics cannot use the brake rotor when the thickness drops below this level.
19mm for front and 8mm for rear on 2002-2005 models
2004 ford explorer minimum rotor thickness
The minimum rear brake rotor thickness on a 1996 Lexus LS400 is 15mm.
The minimum front brake rotor thickness is three aids of an inch. When the rotor does not have the minimum thickness the auto mechanic replacing the brakes can not use the rotor.
If you pull one of the front wheels the minimum thickness should be stamped or molded into the brake rotor near the hub area. I own a 2000 CR-V and the minimum thickness on mine shows as 18 millimeters.
The minimum disc brake rotor thickness specifications for the 2006 Lexus GS are:Front: 27mmRear: 16.5mm
For a CX, DX, LX (and I think EX and SI) trim it is 19mm or 0.75" minimum. Make sure you are measuring the thickness where the brake pads contact the rotor, not on the outer lip which is thicker.