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.
NOTE:
Rotor and hub are cast as integral assemblies on most vehicles; however, if they are separate components, it is allowable to replace each component as necessary.
1969-70 Brake Disc Specifications (1)
| Parallelism, All Except Pontiac | .0005" | |
| Pontiac | .0007" | |
| Runout, Buick & Pontiac | .004" | |
| Oldsmobile | .005" | |
| Chevrolet | .002" | |
| Minimum Thickness, Buick | .8875" | |
| Chevrolet | 1.215" | |
| Chevelle, Chevy Nova, Camaro | .965" | |
| Pontiac | 1.195" | |
| Tempest, Grand Prix, Firebird | .960" | |
| Olds. F-85, Cutlass, 442, Vista Cruiser | .965" | |
| Olds. Delta, Ninety-Eight, Toronado | 1.215" | |
| Surface, Micro-Inches Buick, Chevrolet | 30-50 | |
| Pontiac | 20-60 | |
| Oldsmobile | 30-40 | |
1971-72 Brake Disc Specifications (1)
| Parallelism, All Except Cadillac, Pontiac | .0007" | ||
| Cadillac, Pontiac (Exc. Ventura II) | .0005" | ||
| Ventura II | .0007" | ||
| Runout, Buick, Skylark, GS, Sport Wagon | .004" | ||
| All other models | .005" | ||
| Cadillac | .0025" | ||
| Eldorado | .008" | ||
| Chevrolet | .005" | ||
| Oldsmobile, F-85, Cutlass, 442, Vista Cruiser | .004" | ||
| Delta 88, Custom Cruiser, Ninety-Eight | .005" | ||
| Toronado | .002" | ||
| Pontiac | .004" | ||
| Minimum Thickness, Buick, Skylark, GS & Sport Wagon | .965" | ||
| All other models | 1.215" | ||
| Cadillac | 1.21 5" | ||
| Eldorado | 1.190" | ||
| Chevrolet | 1.21 5" | ||
| Chevelle, Nova, Camaro | .965" | ||
| Chevy Vega | .440" | ||
| Oldsmobile, F-85, Cutlass, 442, Vista Cruiser | .965" | ||
| Toronado | 1.170" | ||
| All other models | 1.215" | ||
| Pontiac, Catalina, Grandville, Bonneville | 1.21 5" | ||
| All other models | .965" | ||
| Surface, Micro-Inches, Buick | 30-80 | ||
| Chevrolet, Pontiac | 20-60 | ||
| Oldsmobile | 30-50 | ||
1973 Brake Disc Specifications (1)
| Minimum Thickness After Refinish | |||||
| Buick - Century, Regal | .980" | ||||
| Exc. Century, Regal | 1.230" | ||||
| Cadillac - Exc. Eldorado | 1.220" | ||||
| Eldorado | 1.205" | ||||
| Chevrolet - Exc. Impala, Vega | .980" | ||||
| Impala | 1.230" | ||||
| Vega | .455" | ||||
| Oldsmobile - Omega, Cutlass | .980" | ||||
| 88, 98 | 1.230" | ||||
| Toronado | 1.185" | ||||
| Pontiac - Bonneville, Catalina, Grand Ville | 1.240" | ||||
| LeMans, Firebird, Grand Prix | .965" | ||||
| Ventura | .980" | ||||
| Discard Thickness | |||||
| Buick - Century, Regal | 965" | ||||
| Exc. Century, Regal | 1.215" | ||||
| Cadillac - Exc. Eldorado | 1.215" | ||||
| Eldorado | 1.190" | ||||
| Chevrolet - Exc. Impala, Vega | .965" | ||||
| Impala | 1.215" | ||||
| Vega | .440" | ||||
| Oldsmobile - Omega, Cutlass | .965" | ||||
| 88, 98 | 1.215" | ||||
| Toronado | 1.170" | ||||
| Pontiac - Bonneville, Catalina, Grand Ville | 1.215" | ||||
| LeMans, Firebird, Grand Prix | .965" | ||||
| Ventura | .980" | ||||
| Lateral Runout | |||||
| Buick - All | .004" | ||||
| Cadillac - Exc. Eldorado | .005" | ||||
| Eldorado | .008" | ||||
| Chevrolet - All | .005" | ||||
| Oldsmobile - Omega, Cutlass | .004" | ||||
| 88, 98 | .005" | ||||
| Toronado | .002" | ||||
| Pontiac - All | .004" | ||||
| Parallelism | |||||
| Buick - All | .0005" | ||||
| Cadillac - Exc. Eldorado | .0007" | ||||
| Eldorado | .0005" | ||||
| Chevrolet - All | .0005" | ||||
| Oldsmobile - All | .0005" | ||||
| Pontiac - Exc. Ventura | .0007" | ||||
| Ventura | .0005" | ||||
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