SMU - Revised Disc Brake Specifications/New Caution Statement Added. Cadillac DeVille 2005

Subject:

Revised Disc Brake Specifications/New Caution Statement Added

Models:

2005 Buick LeSabre Built After VIN Breakpoint 5U129026

2005 Cadillac DeVille Built After VIN Breakpoint 5U129029

2005 Chevrolet Impala, Monte Carlo Built After VIN Breakpoint 59143076 (with ABS[JL9]) or 59148924 (without ABS [J65])

2005 Pontiac Bonneville Built After VIN Breakpoint 5U129028

This bulletin is being issued to revise the Brake Component Specifications in the Disc Brakes sub-section of the Service Manual and add a new Caution statement to several procedures. Please replace the current information in the Service Manual with the following information.

The following information has been updated within SI. If you are using a paper version of this Service Manual, please make a reference to this bulletin on the affected page.

A running change was made in the 2005 model year to the front brake rotors and pads. The rotor specifications are different between the first design and second design rotors. The brake rotors and pads cannot be interchanged between the first and second designs.

Disc Brake Component Specifications (Buick LeSabre)

Caution: Two different designs of the front brake rotors and front brake pads are used on this vehicle. Do NOT interchange first design and second design parts, or a loss of braking and personal injury could occur.

Application	Specification
Application	Metric	English
Front Brake Pads
Taper	0.15 mm	0.006 in
Front Brake Rotors
Rotor Diameter 15 inch	278.0 mm	10.9 in
Rotor Diameter 16 inch First and Second Design	303.0 mm	11.9 in
Rotor Discard Thickness* 15 and 16 inch, First Design Before VIN 5U129026	30.7 mm	1.209 in
Rotor Discard Thickness 16 inch, Second Design After VIN 5U129026	28.5 mm	1.122 in
Rotor Maximum Allowable Assembled Lateral Runout	0.06 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
Rotor Minimum Allowable Thickness after Refinishing 16 inch, First Design Before VIN 5U129026	31.08 mm	1.224 in
Rotor Minimum Allowable Thickness after Refinishing 16 inch, Second Design After VIN 5U129026	28.66 mm	1.125 in
Rotor Thickness New, First Design Before VIN 5U129026	32.20 mm	1.267 in
Rotor Thickness New 16 inch, Second Design After VIN 5U129026	30.0 mm	1.181 in
Rear Brake Pads
Taper	0.15 mm	0.006 in
Rear Brake Rotors
Rotor Diameter	281.00 mm	11.6 in
Rotor Discard Thickness*	9.00 mm	0.354 in
Rotor Maximum Allowable Assembled Lateral Runout	0.06 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
Rotor Minimum Allowable Thickness after Refinishing	10.25 mm	0.404 in
Rotor Thickness New	11.00 mm	0.433 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 thickness specification.

Disc Brake Component Specifications (Cadillac DeVille)

Application	Specification
Application	Metric	English
Front Brake Pads
Taper	0.15 mm	0.006 in
Front Brake Rotors
Rotor Diameter, First Design Before VIN 5U129029	303.0 mm	11.9 in
Rotor Diameter, Second Design After VIN 5U129029	303.0 mm	11.9 in
Rotor Diameter (J55)	325.0 mm	12.8 in
Rotor Discard Thickness*, First Design Before VIN 5U129029	30.7 mm	1.209 in
Rotor Discard Thickness*, Second Design After VIN 5U129029	28.5 mm	1.122 in
Rotor Discard Thickness (J55)*	36.5 mm	1.437 in
Rotor Maximum Allowable Assembled Lateral Runout	0.06 mm	0.002 in
Rotor Maximum Allowable Assembled Lateral Runout (J55)	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
Rotor Maximum Allowable Thickness Variation (J55)	0.025 mm	0.001 in
Rotor Minimum Allowable Thickness after Refinishing, First Design Before VIN 5U129029	31.08 mm	1.224 in
Rotor Minimum Allowable Thickness after Refinishing, Second Design After VIN 5U129029	28.66 mm	1.125 in
Rotor Minimum Allowable Thickness after Refinishing (J55)	37.0 mm	1.457 in
Rotor Thickness (New), First Design Before VIN 5U129029	32.20 mm	1.267 in
Rotor Thickness (New), Second Design After VIN 5U129029	30.0 mm	1.181 in
Rotor Thickness (New, J55)	38.00 mm	1.496 in
Rear Brake Pads
Taper	0.15 mm	0.006 in
Rear Brake Rotors
Rotor Diameter	297.00 mm	11.7 in
Rotor Diameter (J55)	29.00 mm	1.142 in
Rotor Discard Thickness*	9.00 mm	0.354 in
Rotor Discard Thickness (J55)*	27.5 mm	1.083 in
Rotor Maximum Allowable Assembled Lateral Runout	0.06 mm	0.002 in
Rotor Maximum Allowable Assembled Lateral Runout (J55)	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
Rotor Maximum Allowable Thickness Variation (J55)	0.025 mm	0.001 in
Rotor Minimum Allowable Thickness after Refinishing	10.25 mm	0.404 in
Rotor Minimum Allowable Thickness after Refinishing (J55)	28.0 mm	1.102 in
Rotor Thickness (New)	11.00 mm	0.433 in
Rotor Thickness (New, J55)	29.00 mm	01.142 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 thickness specification.

Disc Brake Component Specifications (Chevrolet Impala, Monte Carlo)

Application	Specification
Application	Metric	English
Front Brakes Caution: Two different designs of the front brake rotors and front brake pads are used on this vehicle. Do NOT interchange first design and second design parts, or a loss of braking and personal injury could occur.
Rotor Discard Thickness*
1st Design: before VIN break 59143076 (RPO JL9), or before VIN break 59148924 (RPO J65)	30.7 mm	1.21 in
2nd Design: after above VIN breaks	28.6 mm	1.13 in
Rotor Maximum Allowable Assembled Lateral Runout	0.06 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
Rotor Minimum Allowable Thickness After Refinish
1st Design: before VIN break 59143076 (RPO JL9), or before VIN break 59148924 (RPO J65)	31.08 mm	1.22 in
2nd Design: after above VIN breaks	29.0 mm	1.14 in
Rotor Thickness - New
1st Design: before VIN break 59143076 (RPO JL9), or before VIN break 59148924 (RPO J65)	32.2 mm	1.27 in
2nd Design: after above VIN breaks	30.0 mm	1.18 in
Rear Brakes
Rotor Discard Thickness*	9.0 mm	0.35 in
Rotor Maximum Allowable Assembled Lateral Runout	0.06 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
Rotor Minimum Allowable Thickness After Refinish
1st Design: before VIN break 59143076 (RPO JL9), or before VIN break 59148924 (RPO J65)	10.0 mm	0.39 in
2nd Design: after above VIN breaks	9.35 mm	0.37 in
Rotor Thickness - New	11.0 mm	0.43 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 thickness specification.

Disc Brake Component Specifications (Pontiac Bonneville)

Application	Specification
Application	Metric	English
Front Brake Pads
Taper	0.15 mm	0.006 in
Front Brake Rotors
Rotor Diameter Small (L36)	278.0 mm	10.9 in
Rotor Diameter Large (L36), First Design Before VIN 5U129028	303.0 mm	11.9 in
Rotor Diameter Large (L36), 16 inch, Second Design After VIN 5U129028	303.0 mm	11.9 in
Rotor Diameter (LD8)	323.0 mm	12.7 in
Rotor Discard Thickness* First Design Before VIN 5U129028	30.7 mm	1.209 in
Rotor Discard Thickness* Second Design After VIN 5U129028	28.5 mm	1.122 in
Rotor Maximum Allowable Assembled Lateral Runout	0.06 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
Rotor Minimum Allowable Thickness after Refinishing (L36), First Design Before VIN 5U129028	31.08 mm	1.224 in
Rotor Minimum Allowable Thickness after Refinishing 16 inch, Second Design After VIN 5U129028	28.66 mm	1.125 in
Rotor Minimum Allowable Thickness after Refinishing (LD8)	30.70 mm	1.209 in
Rotor Thickness (New), First Design Before VIN 5U129028	32.20 mm	1.267 in
Rotor Thickness 16 inch, Second Design After VIN 5U129028	30.0 mm	1.181 in
Rear Brake Pads
Taper	0.15 mm	0.006 in
Rear Brake Rotors
Rotor Diameter (L36)	281.00 mm	11.06 in
Rotor Diameter (LD8)	297.00 mm	11.7 in
Rotor Discard Thickness*	9.0 mm	0.354 in
Rotor Maximum Allowable Assembled Lateral Runout	0.06 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
Rotor Minimum Allowable Thickness after Refinishing	10.25 mm	0.404 in
Rotor Thickness (New)	11.00 mm	0.433 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 thickness specification.