| Diagram | Fig. 19 — Hydraulic System - Rear Brake · ref 3 |
| Subsystem | brakes |
| Listed in parts books | 1975 |
| Also fits (as replacement) | 1976–1980, 1983 · for 60-4366 |
Norton Seal, Bellows
Rubber diaphragm seal for the rear brake fluid reservoir cap on the hydraulic brake system.
This is the rubber diaphragm seal that sits inside the brake fluid reservoir cap on the rear hydraulic brake system. Catalog records place it in the rear brake hydraulic circuit on a 1975 machine, and it's cataloged as a Norton part rather than a Triumph one. The diaphragm collapses down inside the cap and keeps the fluid reservoir sealed off from open air, cutting down on moisture and contamination getting into the brake fluid over time.
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It's a simple part but an important one to keep supple and correctly seated - a cracked or hardened diaphragm lets air and moisture into the system, which is bad news for a hydraulic brake circuit. If yours looks dried out, stiff, or torn, it's worth swapping out along with checking the paper gasket that sits under the cap alongside it.
Our catalog only shows this one appearance, tied to the rear brake hydraulic system, so if you're trying to match it up against a different parts book, give us a call and we'll help confirm you've got the right one before you order.
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