2004 ISUZU RODEO Service Brakes Problems

In Florida, I purchased my 2004 Isuzu Rodeo March 2005 at 134 miles. I've always had issues, but didn't know how to articulate the issues. My truck sits/leans to the right and low in the back. It is uneven as if the shocks or struts are off. Driving one night, the truck slams down/drops low out of no where while driving. When I am driving and need to brake, I have to brake then brake again. I dare not make any sharp turns by parking or anything it's like the truck will slip or axels bend. I am have trouble with the engine currently(September 2022). Oil is leaking but you can't see from where. The engine is making loud rambling sounds. The exhaust sounds muffled. My car parts are not exact because my Rodeo is built like a demo, seemingly. Power Reduced & check engine light happens randomly usually while...

BRAKES PEDAL PULSES LIKE CRAZY BUT THE BRAKES DON'T WORK WHEN APPLIED.

TL* THE CONTACT OWNS A 2004 ISUZU RODEO. WHILE THE VEHICLE WAS BEING SERVICED FOR AN UNRELATED REPAIR, THE MECHANIC NOTICED THAT THE BRAKE LINE WAS RUSTED AND CAUSED BRAKE FLUID TO LEAK. THE MECHANIC ALSO STATED THAT BOTH OF THE REAR BRAKES, CALIPERS, AND BRAKE LINES NEEDED TO BE REPLACED. A NON-CERTIFIED MECHANIC PERFORMED A TEMPORARY REPAIR ON THE VEHICLE TO STOP THE BRAKE FLUID LEAK. IN ADDITION, THE CONTACT HAD TO MAKE SEVERAL ATTEMPTS TO REMOVE THE KEY FROM THE IGNITION SWITCH. THE MANUFACTURER WAS NOT NOTIFIED. THE VIN WAS UNAVAILABLE. THE APPROXIMATE FAILURE MILEAGE WAS 89,000.