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Your system needs a complete rebuild. From cleaning the reservoir tank and the small filters within, all rubber hoses within the brake system, all components removed and cleaned. The brake distribution valves are clogged with rubber hose break down debris and rust.. This is the deal breaker with cars left not running for a long time.
 

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It's not doom and gloom...Just reality when a RR sits for a very long time. If you do not have a shop to do the work or no funds or lack the expertise........yes the car is doomed.
 

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If you have a master cylinder, there will be 3 screens in the tank. Remove with a 1" socket, clean carefully and check for tears in the screens.
 

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Some of it will rub off and the long term cure is to completely break down the tank to have it electroless-nickel plated, but thats an undertaking. You can fill with DOT 3 for testing and moving things along, but the system needs a lubricant in the brake fluid. The RR363 is no longer available and there is an accepted substitue commercially. Many in the SY community use DOT4 plus 10% pharma castor oil.
Here's a plated tank.
White Light Black Gas Auto part
Tap Plumbing fixture Gas Metal Auto part
White Light Black Gas Auto part
Tap Plumbing fixture Gas Metal Auto part
Font Gas Metal Number Electric blue
 
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