[Healeys] Brake Servo Operation

[mitch]

Hello,

I have the original servo on my 1966 BJ8  (Girling MK2A) it was rebuilt by PO at some time
I recently noticed  when stopped at a light….idling ,foot on brake……the idle increases by about 300-500 rpm… is this normal?  Also noticed the brake peddle is a little lower when applied.   
The car appears to stop …OK
What tests can I do ?
Can I put a new check valve in vacuum line ……without removing the valve on the servo?  Or would that cause a problem?
And yes I looked in the archives…….little confusing
Any help would be appreciated

Cheers
Mitch

Sent from Mail for Windows 10

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