Meritor numbers appear across foundation brakes, air-system components, wheel-end parts, and automatic slack adjusters. A part number is the fastest starting point, but the replacement still needs to match the component type and its complete technical configuration.
Common Meritor numbers and GBK replacement options
| Meritor Part Number | Component | GBK Option | What to Verify |
|---|---|---|---|
| E-20S | Type 20 service brake chamber | PAT-20 | Stroke, pushrod, mounting-stud spacing, ports, and clevis |
| E-BC30S | Type 30 service brake chamber | PAT-30 | Stroke, pushrod length, mounting pattern, and port configuration |
| 3030TN2-HNTRX-C | Type 30/30 regular-stroke spring brake | GT-30/30 | Stroke, threaded rod length, clevis, ports, caging hardware, and clearance |
| R955205 | SS1200-style air dryer | GAD955205 | 12V heater, ports, mounting, purge configuration, and application |
| R955300 | SS1200P-style air dryer | GAD955300 | Dryer family, pressure configuration, ports, heater, and mounting |
| R955065225 | AD-9-style air dryer application | GAD065225 LAD9C-065225 |
Bracket inclusion, ports, heater voltage, and mounting dimensions |
| R801074 / R803112 | Automatic slack adjuster | PA801074ASA | 6" arm, 28 splines, 1.5" spline diameter, offset, and mounting |
| A3222F1982 / KSMA2121308Q | 1308Q brake shoe kit | B-1308Q | FMSI family, 15" x 4" size, 23K rating, axle position, lining, and hardware |
| 122921 | 15" x 4" brake drum | M328N923 | Brake size, bolt holes, pilot, bolt circle, offset, and drum weight |
| Steellite 53-123537-002 | Lightweight steel-shell brake drum | GDSSD1657 | 16.5" x 7" brake size, 10-hole pattern, pilot, offset, GAWR, and application |
Match the specification that controls fitment
Different Meritor component families require different checks:
- Brake chambers: type, stroke, pushrod length, mounting, ports, and clevis
- Air dryers: model family, heater voltage, port locations, pressure setting, purge valve, and bracket
- Slack adjusters: arm length, spline count, spline diameter, offset, and adjustment system
- Brake shoes: FMSI family, brake size, lining rating, axle position, and hardware
- Brake drums: brake size, pilot, bolt circle, bolt-hole count, offset, flange, and weight class
Why an FMSI number is not the only brake-shoe check
An FMSI number helps identify shoe geometry, but the complete replacement should also match the brake size, lining specification, axle rating, axle position, and included hardware. Do not assume every product carrying the same base FMSI family is identical.
Air dryer bracket and configuration differences
The same basic dryer application may be available as a bracketed or no-bracket assembly. For example, a no-bracket replacement may be appropriate only when the existing mounting bracket can be reused and the ports, voltage, and dimensions match.
Search the Meritor cross-reference page, or browse brake chambers, air dryers, slack adjusters, brake shoes, and brake drums.
Contact GBK with the full Meritor number and original-part photos when the product family or configuration is unclear.
Meritor, WABCO, and related marks belong to their respective owners. GBK is an independent aftermarket supplier and is not affiliated with, sponsored by, or endorsed by those companies. Part numbers are used for identification and cross-reference purposes only.
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