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Glyn,
I believe that the push rod from your brake pedal is too long. If the rod is
adjustable, then the rod needs to be shortened. This keeps the piston, and
sealing cups in the master cylinder blocking the return hold. While you drive the car the brake heat up.The expanding fluid is returned to the master cylinder. If this hole is blocked the brake will apply on their on while you
are driving. Some time to the point the car can't be moved at all. A quick
test for this would be after the brake lock up,to crack the brake lines where they come out of the master cylinder to release any build up pressure. If the
car becomes drivable after this, the push rod is too long, and blocking the
return port in the master cylinder. The adjustment may be only as little as
1/8 to 1/4 inch.
How do I know? I have been there.
Good luck
Don
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