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Hydraulic brake service reaches the sealing point with the Meritor Brake Master Cylinder Piston Cup. This piston cup belongs inside the master cylinder, where it helps seal fluid pressure as the piston moves through the bore. It can help correct poor pedal feel, internal fluid bypass, or weak hydraulic response in the brake system. The part is small, but its job is tied directly to pressure control inside the cylinder body. The Meritor GAFF20320 renews the piston cup sealing point for brake master cylinder repair.
| VMRS Code | 040-000-000 |
| Inside Diameter | 1 31/32 in., 50.01 mm |
| Brand | Meritor |
| Length | 31/32 in., 24.61 mm |
| Outside Diameter | 103.19 mm, 4 1/16 in. |
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