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Your NOT going to see any bubbles with a vacumn leak; as NO air is coming out! Atmospheric Pressure IS going in! I'am with RoBeRt, it sounds like a ruptured Brake Booster Diaphram. You'll have to borrow a Vacumn Gauge. Your Vacumn at idle (1000 RPM) should be between 15 and 17 Inches of Mercury. Mine is 19-20. If you are lower than 15 Inches I would suspect a Vacumn leak; also, a rising and lowering needle with-in a range of 5-10 Inches, would indicate a Vacumn leak. Could also be a short in the brake lights, effecting the ignition, BUT that should blow the fuse! Could also be WHERE you have the Ignition 12 Volts, wired to? And if you are using a Ballast resister (wire or ceramic block), or not. As the brake lights could draw off current from the Coil or Ignition box or both. Anything is possible with these Machines. As mention above, could even be fuel!! Either Fuel bowl level or the Idle screws are screwed IN to far. Good-Luck with it! And let us know how you make out. Marlin.
Stalling during a panic stop is usually one of two things: either fuel is slopping out of the float bowl vents and flooding the engine or the engine is starving due to fuel slosh in the bowls. Neither are easy to diagnose since both are transient problems that happen only when the car is rolling. To fix the first, traditionally one takes a piece of tygon tubing and joins the float vents in a fairly tall loop, with a single venting hole in the top of the loop, up inside the air cleaner opening. The second required jet extensions, or turning the carb(s) sideways or stuffing blocks inside the bowls to control slosh. If your problem is something else, first look very closely at your motor mounts, to be sure the rubber isolaters aren't deteriorated or the mounting bolts broken, allowing the engine to shift under braking. Both are common & either can cause all sorts of bad-news re stretched wires, cracked hoses etc.
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