3.0 v6 brakes HELP PLEASE

[Jenko23]

Sat at traffic lights the other night went to pull off and brake pedal wouldn't release therefore locking brakes on,
pulled the pedal up by hand was quite hard to pull up and drove fine,doesn't do it under light braking on way home but
heavy brakes when I got home and it did it again. Any ideas people.

 

[desertstorm]

If the bungs in the plenum chamber have got blocked at some point in the past the brake servo can end up partially submerged in water. This can find it's way in there and cause corrosion which can cause issues. otherwise I would say it's an issue with the master cylinder .

Karl.

 

[Jenko23]

Is there anyway to check which part is faulty