WHAT IS THE MIN THICKNESS BEFORE REWORK ON FRONT AND REAR BRAKE ROTORS. I WOULD LIKE TO CHECK MY SELF AND COMPARE SHOPS FINDINGS
ON most disc rotors the minimum thickness is cast into the body of the rotor and will read min thickness and a dimension. The dimension is also available in the workshop manuals and from the service department of your vehicle. Do not be surprised if you find that your dimensions are almost at do not machine limits as original rotors are not much thicker than the low limit.
SOURCE: 2003 sierra rear brake rotors
there is many kind of brake system of ur truck here i will send u everything about the brake and i hope its help
Rear Brakes JC3
Rotor Discard Thickness*
18.50 mm/0.728 in
Rotor Minimum Allowable Thickness After Refinish
19.0 mm/0.748 in
Rotor Thickness (new)
20.0 mm/0.787 in
Rotor Maximum Allowable Lateral Runout
0.05 mm/0.002 in
Rotor Maximum Allowable Scoring
1.50 mm/0.059 in
Rotor Maximum Allowable Thickness Variation
0.025 mm/0.001 in
Rear Brakes JC4
Rotor Discard Thickness*
28.50 mm/1.122 in
Rotor Minimum Allowable Thickness After Refinish
29.0 mm/1.142 in
Rotor Thickness (new)
30.0 mm/1.181 in
Rotor Maximum Allowable Lateral Runout
0.05 mm/0.002 in
Rotor Maximum Allowable Scoring1
.50 mm/0.059 in
Rotor Maximum Allowable Thickness Variation
0.025 mm/0.001 in
Rear Brakes JH2
Rotor Discard Thickness*
28.50 mm/1.122 in
Rotor Minimum Allowable Thickness After Refinish
29.0 mm/1.142 in
Rotor Thickness (new)
30.0 mm/1.181 in
Rotor Maximum Allowable Lateral Runout
0.05 mm/0.002 in
Rotor Maximum Allowable Scoring
1.50 mm/0.059 in
Rotor Maximum Allowable Thickness Variation
0.025 mm/0.001 in
Rear Brakes JH6
Rotor Discard Thickness*
27.50 mm/1.082 in
Rotor Minimum Allowable Thickness After Refinish
28.0 mm/1.102 in
Rotor Thickness (new)
29.0 mm/1.141 in
Rotor Maximum Allowable Lateral Runout
0.05 mm/0.002 in
Rotor Maximum Allowable Scoring
1.50 mm/0.059 in
Rotor Maximum Allowable Thickness Variation
0.025 mm/0.001 in
Rear Brakes JH7
Rotor Discard Thickness*
28.5 mm/1.122 in
Rotor Minimum Allowable Thickness After Refinish
29.0 mm/1.142 in
Rotor Thickness (new)
30.0 mm/1.181 in
Rotor Maximum Allowable Lateral Runout
0.05 mm/0.002 in
Rotor Maximum Allowable Scoring
1.50 mm/0.059 in
Rotor Maximum Allowable Thickness Variation
0.025 mm/0.001 in
* All brake rotors have a discard dimension cast into them. Replace any rotor that does not meet this Specification. After refinishing the rotor, replace any rotor that does not meet the minimum or discard thickness specifications.
SOURCE: rear brake rotor minimum thickness
Go to and autoparts supplier web-site like Autozone. you can get the spec's there.
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