In gereral terms replacement of the diaphram is required after being
contaminated with brake fliud. However in practice if you allow the servo to
dry out you have a pretty good chance that the servo will operate
satisfactory.
The replacement of the diaphram on a Girlng servo is a specialist job as the
two halves must be split. If you are lucky and have the Lockheed type,
repair kits were available in the 60s. I have seen one of these for sale
recently on eBay.
I would try the drying out procedure first.
A quick test to check servo operation is as follows:
1 Run the engine, apply foot pressure making sure that you have a solid
pedal (No sponginess or creep)
2 Release pedal pressure and stop engine.
3 Pump pedal 5-10 times to evacuate system
4 Apply pedal pressure and hold.
5 Start engine.
Pedal should dip slightly as engine starts. If this happens servo is
working. If no noticable dip in pedal you have a servo problem or an air
leak from the manifold.
This is the standard test carried out by qualified people annually on our
MOT Test (Road worthiness) here in UK.
Regards.
Adrian TR4A
CT64306 O
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