WABCO part numbers starting 540
| 540108 | Cage assembly | WABCO | ||
| 540139 | Brake cylinder | WABCO | ||
| 540141 | Rod | WABCO | ||
| 540149 | Cock | WABCO | ||
| 540211 | Adaptor filter | WABCO | ||
| 540285 | Air compressor oil pump | WABCO | ||
| 540286 | Plunger ring | WABCO | ||
| 540293 | Oil pump cartridge | WABCO | ||
| 540333 | Pressure gage | WABCO | ||
| 540490 | Lining | WABCO | ||
| 540570 | Retaining ring (valve, automatic brake) | WABCO | ||
| 540589 | Con rod bearing | WABCO | ||
| 540590 | Bearing (0.020) | WABCO | ||
| 540591 | Con rod bearing 030 | WABCO | ||
| 540592 | Bearing set 0.040 in undersize | WABCO | ||
| 540745 | Application piston | WABCO | ||
| 540749 | Piston assembly | WABCO | ||
| 540753 | Spring guide seat | WABCO | ||
| 540880 | Valve stem | WABCO | ||
| 540881 | Brake valve valve | WABCO | ||
| 540884 | Piston | WABCO | ||
| 540890 | Brake valve valve | WABCO | ||
| 540893 | Fluid valve stem | WABCO |