Steve a new question for you concerning replacing original mixture control on 1965 PA32/260 serial#200.I’d like to replace it with newer style vernier control but can’t find one for my model. I was curious if you would know if this would be something that someone owns a STC for? Seems like the newer styles would be more efficient and safer as well compared to what is essentially a choke cable. Your thoughts again please. Rex

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Brake pedals should not pulse unless you have a warped disc, or the brake itself is not free to slide in and out of the guide pins.
From your latest description I would look closely at the brakes.
I hate to say it, but I have seen the aluminum brake housings warped due to excessive torque applied to what's called the tie bolts.
I recommend that you download a copy of the Cleveland Technician's Guide at :https://www.parker.com/literature/WBtech.PDF.
Check for a warped disc and to make sure the brake assy slides in and out (without cocking) on the guide pins. If the brake pads are worn unevenly, it shows that the brake is binding instead of sliding.
Let me know what you find.
S

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The "fuel flow" gauge is actually a fuel pressure gauge calibrated in gallons.
The electric pump pressure is controlled by a relief valve in the body of the pump, as I remember it.

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