Howdy. I've got an '87 classic with the Lockheed brakes. The servo was rebuilt about five years ago. Now when it's cold I can hear a vacuum leak from around the pedal cluster, once it warms up the leak is no longer audible.

That said, my big question isn't about fixing this servo, the question is, why did Rover go from Lockheed to Girling? Are the Lockheed units just problematic?