So my 1986 Camaro IROC Z with all wheel disc brakes started having a weird issues over a month ago. Sometimes when braking or during slow turns, my engine bogs down and sometimes stalls. I replaced every vacuum line and will do the vacuum canister (I'm 99% that only controls HVAC inside). I'm wondering if it's the brake booster. My brakes themselves were fully redone 2 years ago (discs, calipers, pads, fluid, etc). But I'm 99% the booster is original, it has 225K+ miles on it. Could this be the early symptoms of a failing brake booster. Is there a way to test it to make sure?

I do know the parking brake light comes on when the battery or alternator has issues (alternator was replaced 3 years ago) but usually fuses pop and my headlight alarm stays on when that happens. I checked them both with the multimeter and no problems.

 

Has nothing to do with the brake booster. Either the parking brake switch is bad, or you have a leak inthe hydraulic system (or bad master cylinder)...

 

Ok. Is there a way to check? The fluid in the reservoir is full.

Could a hydraulic leak or bad master cylinder also cause stalling? I haven't noticed any brake issues, pedal feels normal.

 

The brakes have nothing to do with stalling. Make sure the parking brake lever is completely in the down position. If the light stays on, I would suspect the switch...

 

Yeah it's 100% down. I'll order a new switch and try that first.