Lately I have noticed the revs dropping when braking especially when at lights stopping suddenly.
Today I did some testing.
Checked the piping and changed the check valve from the vacuum source manifold.
When idling I depressed the brake repeatedly and each time the revs dropped until almost stalling.
Quick blip on the throttle and revs back up again.
If I start the engine with foot on the brake it drops and softens which I expected.
Could this be the drum failing? A small hole in the diaphragm?
Thanks
Revs drop when depressing brake
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