Rotor Servicing: Parallelism

Check thickness of rotor at four or more points around circumference. Make all measurements at same distance from edge of rotor. If thickness varies more than specified, refinish or replace rotor, as necessary.

Rotor Specifications

Flatness, Exc. 1972-73 Corvette

.001"

1972-73 Corvette

.002"

Parallelism, All

.0005"

Runout, 1967-69, All Exc. Corvette ⁽²⁾

.004"

1965-69 Corvette Front

.004"

1965-69 Corvette Rear

.003"

1970 Corvette

.002"

1971-73 Corvette

.005"

Minimum Thickness, 1" Disc

.965"

1 1/4" Disc

1.215"

Surface, Micro-Inches, 1965-70, All

30-50

1971-73 Corvette

20-60

⁽¹⁾	Light scoring, less than.015" in depth, will not be detrimental to brake operation. Turning or refinishing discs to remove light scoring is not necessary.

⁽²⁾	If Chevrolet front disc is turned, runout must not exceed.002". Turning disc is not recommended on Chevrolet front wheels.