[Healeys] brake servo causing rpms to increase 500 rpms

[Pieter and Linda]

Sounds like an air leak in the diaphragm. If the revs go up 500 and  
stay steady it also means your running a bit rich at idle,
cheers
Pieter
On 07/06/2009, at 8:11 PM, Bill B wrote:

> hello fellow Healeyites:
> still having brake servo problems
> on a bj8, when i apply brake pedal pressure, the engine turns  
> increase by
> 500 rpms... hear a "hissing" sound coming from the servo...seems to  
> brake
> ok, but this rpm thing can't be...
>
> any suggestions?
>
> thanks in advance,
> Bill Browning
> Charlotte
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