Why does the car want to die when you hit the brakes?


Active Member
Apr 3, 2012
Dallas, Tx
My brother just got a 91' Coupe, 5-speed, 306, GT40 heads, big cam, demon carb, power brakes, vacuum canister, no power steering.

Car runs strong, no problems, except when you get ready to come to a stop, when you hit the brakes the car acts like it wants to die, and sometimes will? It only does it when you hit the brakes? Anyone know where to start?

Any feedback is appreciated.

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15 Year Member
Jan 15, 2003
Greencastle Pa
Die when sitting still and you hit the brakes? Once. Or when you hit them a bunch of times? When moving and braking? Float levels? Idle speed?


Active Member
Apr 3, 2012
Dallas, Tx
Die when sitting still and you hit the brakes? Once. Or when you hit them a bunch of times? When moving and braking? Float levels? Idle speed?
It doesnt do it while sitting still idling. It only does it when driving slow coming to a stop. Even if you only hit the brakes once. Not sure on the float levels right off, idling at 900 rpms.


They make new pistons every day, so why worry?
Mod Dude
Jul 2, 2009
South Jersey
Definitely check the float levels, you also may want to think about jet extensions for inside the float bowl. Wouldn't hurt to take the carb off to go through it and clean it out either.

Bill Gordon

Active Member
Sep 20, 2012
Broomfield, CO
My carbed 83 GT 5 speed had a dashpot, when it failed the car would die when you took your foot off the gas, brake or not...with the stock Holley 4180. Installed a Holley street avenger carb, ran fine without a dashpot.


Stroked and Juiced
10 Year Member
Nov 5, 2008
how are your brakes working? could have a tear in brake booster diaphragm causing a vacuum leak
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