8" Girling single circuit brake servo

B

BBLongman

New Member
Just having a few problems with the servo in my car. Does someone have an exploded diagram or no the answer to this question if they have rebuilt a servo.

The slave piston is retained on the end of the rod by a pin. Should the spring inside the slave piston push against the pin so as to hold the rod against the valve in the end of the piston (i.e. shut) OR hold the rod away from the valve so that the it is held open?

I hope that's clear!

Also so does anyone know if it possible to get a kit of parts to rebuild the air valve (or get a complete new air valve)

ALSO has anyone got this servoed brake system to work really nicley they seem to be a bit lacking in feel! (Thinking back to previous P6's ive driven they haven't been wonderful)
 
BBLongman
Ill get back to you about the servo.
Brakes are very gentle in operation but also very powerful. A bit like the vacuum brake on a steam engine.
 
BBlongman
Sorry about the delay.This is from the workshop manual;
If the piston has been removed from the rod.
Hold the pushrod in a soft jawed vice,slide the piston over the tapered end of the rod.Hold the small spring within the piston back towards the diaphragm end and insert the small pin into the hole in the pushrod, ensuring that the end of the spring rests against the pin and that it does not pass through the coil of the spring
 
Hi, thanks for the info.

i actually got to the bottom of it in the end and assembled as per your description.

Have now fitted a new airvalve which improved things for a while. However it didn't last and I think the problem is realated to a small weep from the reaction piston seal. This is partially filling the airvalve with brake fluid and possibly affecting the operation.

Also found out that the V8 servo and 4 cyl servos are the same but the V8 airvalve includes a light spring above the diagphram to modify the boost ratio to suit the larger front calipers on the V8. Suggests to me that they are very sensitve to everything in the airvalve being in good condition for efficient operation.
 
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