| Diagram | Fig. 19 — Hydraulic System - Rear Brake · ref 2 |
| Subsystem | brakes |
| Listed in parts books | 1975 |
Norton Cap
A master cylinder cap for Norton hydraulic front or rear brake systems, part number 06-5740.
This is a cap, listed in the Norton catalog under part number 06-5740. The catalog entries place it with the rear brake hydraulic system and with the front brake master cylinder and hose group, so this is a cap for one of the master cylinder reservoirs on a Norton fitted with hydraulic brakes.
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A master cylinder cap like this seals the fluid reservoir, keeping dirt and moisture out while allowing the diaphragm underneath to do its job as fluid level changes with pad or shoe wear. It is a small part but not one to ignore, since a cracked or missing cap lets in contamination that can affect the whole hydraulic system.
Our records show this appearing in catalog entries from 1975. If you are trying to match this to a specific master cylinder on your bike, give us a call and we will confirm fitment before you order.
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