The Bendix drum brakes fitted to these cars are a poor job.
The reason the handbrake is jamming is that the lever pivots on the shoe webs have seized solid so that the handbrake will not release. Unless you take immediate action, there will be a big bang as you move off, and a lining will become detached from a shoe.
A complete stripdown is needed with all suspect parts replaced and the pivots cleaned and lubricated with copper loaded anti-seize compound. The slave cylinders seldom last more than about 3 years and it would be very prudent to replace them. You will need new stub axle nuts.
There are no short cuts - these cars often fail the MOT test due to inadequate rear brakes.
659.
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