`Bleeding‘, for the purpose of expelling all air from the system, should only be necessary when completely recharging the system following the renewal of a component or the disconnection of a brake pipe.
To ‚bleed‘ the system. two operators are necessary.
It is important that the following method is always employed, as air can be introduced into the wheel cylinders past the screw threads of the ‚bleed‘ screws, unless the screws are closed on the return stroke of the master cylinder.
1. Fit a rubber ‚bleed‘ tube to one of the front brake `bleed‘ screws and immerse the free end of the tube in about one inch of brake fluid in a clean bottle.
2. Ensure that the reservoir(s) situated on the right-hand valance plate is full with normal DOT 3 or 4. Maybe you can you RR363 from the Rolls-Royce Silver Shadow. The correct fluid was in the 50s Castrol—Girling Crimson Brake Fluid.
3. Using lever RH.322 on the single master cylinder system or lever RH.417 on the dual master cylinder system, operate the master cylinders with a rapid deliberate forward movement while the second operator slackens the ‚bleed‘ screw. At the end of the forward stroke, close the ‚bleed‘ screw, pull the lever back and pause for 5 seconds to allow the master cylinder plunger to return under the fluence of its return spring.
4. Repeat the pumping action for about 10 cycles or until air bubbles no longer issue from the ‚bleed‘ tube.
5. This operation should be repeated for all wheel cylinders, topping-up the fluid reservoirs as necessary.
On the single master cylinder system, it is necessary only to ‚bleed‘ the front brakes at the point shown in Draw above, as the two wheel cylinders are interconnected.
On the dual master cylinder system, it is essential that both cylinders are ‚bled‘ at each front wheel, since these are operated by separate master cylinders and are not inter-connected.After ‚bleeding‘, a check must be carried out to ensure that the system is completely free of air.
No other method of ‚bleeding‘ is recommended owing to the possibility of aeration of the fluid.