My 1995 geo tracker feels and sounds like it's going to shut off only in idle and the brake light comes on after i put on my brakes hard

vacuum leak on the brake booster.

there is a clear unit on the master cylinder with a level mark. and also chech the e brake lever in the tracker

Sounds like a timing problem....put a timing light on it to ensure the engine is in time. Otherwise, you may have a bad ignition control module (ICU/ECU)...computer. check the timing first...good luck

Try replacing your brake light switch that is located at the top of the brake pedal arm. It might work if you wiggle or shake the switch but most likely you will have to replace the switch. good luck leave comment.

brake light switch under brake pedal

change the hose

well if you replaced the brake hoses, calipers, and pads and it still doing the same it might be your brake booster i had that happened with a honda civic.

sounds like you have a brake claiper piston not return causing the brake pads to drag, jack up both wheels and spin to see if you can feel or hear drag, give the wheel a hard spin and see if it stops right away or seems to spin freely, could be the drag of the pads on the rotor, or wheel bearings need repack or even as much as brake residual fluid pressure on calipers cuased by improper brake mc pushrod adjustment, if you have had any recent brake work like a MC replacement it could be that it was not properly adjusted as far as pedal free play... check those.. please let me know if this helps, rate my help...thanks

Change the front brake pads

and it still has a grinding


what grinds.

did you inspect the wheel bearings

like it says in the maintenance schedules.
ever 15k ?
no , well they are wrecked now.

sorry