Novak Conversions Jeep Wrangler YJ shifters

Revs increase when brakes are applied

jpjeep26uk

YJ Enthusiast
Supporting Member
Joined
Nov 12, 2022
Messages
345
Location
UK
Hi all
My revs have started to go up when I touch the brake pedal or when I stop with the brake and then pull away.
I've read a lot of things but mainly that it's the Brake Booster, probably got an air leak or the diaphragm is busted inside it.

If that's so, then i'll buy an new one and fit it.

But, and here's where I need your help, can it also be related to the Carburettor? I had 32/36 Weber clone put in to replace the EFI.
I've never been able to get it set right and although she runs really well, I have a lot of issues with cold starts, crappy choke mechanism, high idle, normal idle, what have you.
So frequent tweak with a screwdriver has been the only solution.
1. Could playing with the Carb settings affect the brake booster?
2. Anyone out there any good with carbs and can tell my what to do if I send a pic of the carb and point at the bits that I don't understand?
I know how to baseline the carb but within days it needs tweaking and I'm worried I've screwed the brake booster by playing around.
screw diag.jpg


20260102_134316.jpg

I've played around with this screw as I read it was the choke high idle adjuster???
As usual, any help would be hugely appreciated - thanks.
 
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