Meritor Q vs Q+ Brake Shoes
Understanding the critical differences between Meritor/Rockwell Q (4515Q) and Q+ (4707) extended service brake shoes
CRITICAL COMPATIBILITY REQUIREMENTS
- When converting from Q to Q+ extended service: You MUST use Q+ camshafts
- Q and Q+ shoes: Both can be used with Q+ cams
- Q+ shoes CANNOT be used with Q cams
Cam Differences
Meritor Q Cam
- Head diameter: 1-3/8 inches
- Standard pocket depth
- Standard lift
Meritor Q+ Cam
- Head diameter: 1-3/16 inches (smaller)
- Deeper pockets than Q cams
- Increased lift compared to Q cams
Meritor Q Cam Identification
Meritor Q+ Cam Identification
Q vs Q+ Brake Shoe Differences
Meritor Q Brake Shoes
- Standard lining thickness
- Standard lift camshaft
- Standard service intervals
Meritor Q+ Brake Shoes
- Thicker linings for extended service
- High lift camshaft required
- Extended service intervals
Q vs Q+ Part Number Reference
| Shoe Width | Q Part Number | Q+ Part Number |
|---|---|---|
| 5 inches | 4524 | 4720 |
| 6 inches | 4514 | 4715 |
| 7 inches | 4515 | 4707 |
| 8-5/8 inches | 4551 | 4711 |
Compatibility Matrix
| Brake Shoe Type | With Q Cams | With Q+ Cams |
|---|---|---|
| Q Brake Shoes (4515Q) | Compatible | Compatible |
| Q+ Brake Shoes (4707) | NOT Compatible | Compatible |
Important: Always verify camshaft type before installing brake shoes. Using Q+ shoes with Q cams can lead to brake failure.
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