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Do you hear a sucking noise from under the hood when you apply the brakes? You could have a bad brake booster venting too much engine vacuum when applying the brakes causing the engine to die.
Is the brake fluid reservoir low? The master brake cylinder may be leaking, the fluid getting sucked into the brakes power booster and then into the vacuum of the intake manifold. Check the vaccuum hose to the brakes power booster to see if it is wet inside with brake fluid.
IT sounds like a vacuum leak from the brake booster on brake application . Easy test run the car and if it idles ok then put your foot on the brakes and if it stalls it is the booster.
If you have the foot on the brake when stopping and it stalls , try slowing down and stopping on the hand brake to see if the engine stalls . If it doesn't stall on the hand brake then I would suspect a leak in the brake booster that is affecting the engine by letting air into the manifold through the activated booster. If there is no difference have the fault codes read as there may be a missing/ faulty vacuum line connected to a actuator in the gear box.
disconnect the vacuum line to the brake booster and plug off to the engine. run the engine and apply the brakes and see if it still cuts out. If not the reattach the vacuum hose and re apply the brakes . If there is a stall then replace the brake booster as there is a fault in it that is allowing air into the manifold on brake application. This problem is not connected to the CPU by sensor so no faults would be recorded.
when coasting to a stop do you have your foot on the brake
if so , test the brake booster for a vacuum leak
simple test
put the hand brake on and start the car
idles ok ,--no problems
put your foot on the brake
idles ok --not the booster
engine stalls , falters ---brake booster failure
If all maintenance is up to date.Check for vacuum leaks.If the vehicle has a vacuum leak.It will stall more often when the brakes are applied ,but could idle without stalling in park.Because of the vacuum demand for the brake booster,when brakes applied.Also do diagnostics on the computer for code status.Good Luck!!!
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