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Hi, I had a very intermittent problem where my pedal would go solid for a second then be ok.

It is solid all the time now.

With the engine running I have removed solid pipe to servo and there is a big hiss.

Any ideas please.

Dickspanner
 

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Check that the wheels turn freely when brakes are off ,to eliminate seizure of the calipers .The hiss from the vac pipe tends to show the vac pump is working but would be good if you could get it tested to see that the vacuum is sufficient .Dont know a value for the vacuum .Also test that brakes stop a lifted wheel with engine not running to be sure the master cylinder is moving its piston.After that it points to the servo being faulty in some way .Hope this gives you some logical tests to do at least .
 
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