The rear brake cylinders could be seized or stuck a common problem thus the ineffective braking, also the fluid is needing replacement and bleeding, looks like you have a major service to undertake replacing fluids and confirming operation of all components of the car?
Morgans 1934 MX, 1947 Series 1, 1956 +4 TR4, 2000 +4 T16
Triumph Herald 1969 13/60
Morris 1970
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