Disc Brake Component Specifications

2018 Chevrolet Sonic Premier, 4D Sedan, Standard TransSECTION Disc Brake Component Specifications
WARNING: This page is about a different car, the 2018 GMC Canyon and 2018 Chevrolet Colorado. However, it is still accessible from the selected car via links, so may be relevant.
Application Specification
Metric English
Front Brakes
  • Brake Rotor Diameter
310.0 mm 12.20 in
  • Brake Rotor Discard Thickness*
25.0 mm 0.98 in
  • Brake Rotor Maximum Allowable Assembled Lateral Runout
0.05 mm 0.002 in
  • Brake Rotor Maximum Allowable Scoring
1.50 mm 0.059 in
  • Brake Rotor Maximum Allowable Thickness Variation
0.006 mm 0.00024 in
  • Brake Rotor Thickness New
27.0 mm 1.07 in
Rear Brakes
  • Brake Rotor Diameter
324.0 mm 12.76 in
  • Brake Rotor Discard Thickness*
16.5 mm 0.650 in
  • Brake Rotor Maximum Allowable Assembled Lateral Runout
0.05 mm 0.002 in
  • Brake Rotor Maximum Allowable Scoring
1.50 mm 0.059 in
  • Brake Rotor Maximum Allowable Thickness Variation
0.006 mm 0.00024 in
  • Brake Rotor Thickness- New
18.0 mm 0.709 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 discard thickness specification.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.