No - you do not need to have the truck running.
The type of vehicle is not important, but if brake pressure is failing, you need to bleed ALL the brakes.
no
No you dont have to. All I did was was pump the brakes with the car running
No, the engine does not need to be running to bleed the brakes on a 1999 Tahoe. You can bleed the brakes with the engine off, as long as you have someone to pump the brake pedal or use a brake bleeder tool. Just ensure that the brake fluid reservoir is kept topped up during the process to prevent air from entering the system.
yes
Pedal pumps up fine, but when you run the engine, the brake booster applies more force to the lines. Thus compressing any air that may be in there. You will need to bleed the brakes more. I sometimes bleed the brakes with the engine running to correct this.
No.
No, as long as your pedal seemed good before the brake job, and you do not loosen the bleeder at all, you do not have to bleed the brakes.
No you dont need to bleed the brakes if you are just changing the pads, there are more ansers to car maintenance questions at ; www.carbasics.co.uk
Brakes will be dependent upon what type of truck you have and what you are doing with your truck. There is a website that can help brakeworld.com will help walk you through the right selection of high performance brakes for your truck.
adjust isn't really the right word here. if the pedal is soft and the brakes suck, and you have to push it real hard to get any reaction out of the thing, pushing harder may not be the solution. Check the brake fluid reservoir , make sure its full. regardless if it is or not you should bleed the brakes , and you may need new pads. if the brake fluid is real empty you must bleed the brakes.
yes, when you took the line off, you let air into it. so you will have to bleed them.