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I've got a 1974 and swapped in a double diaphram booster from a 240 - about 1978 if I remember. Brakes feel much better.
Re bleeding, the best way I've found is with a friend and an air compressor. Get an old m/c cap, drill a hole in it and fit an old tyre valve stem - the metal ones that screw into the wheel are best. Not really necessary, but it makes it a bit easier. At a pinch you could probably just drill a small hole and forget the valve stem. Take out the valve.
Now jack up the car, put it onto stands, wheels off and start at the rear.
Crank compressor pressure down as LOW as it will go. Friend uses an air pistol on said tyre valve stem to gently pressurise the system while you crack the bleed nipples until the fluid runs clean and bubble free through a clear tube. Close and move on, repeating until all are done.
Be careful not to over pressurise the system. The plastic reservoir will expand a bit under light pressure, but be careful to keep that to a minimum. Also make sure the reservoir stays topped up.
We've found this method to be very easy and very economical on fluid. Usually a 500ml bottle will completely change the system.
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JohnH, Sydney, Australia
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