Brake peddle should be hard, if bake peddle soft check master cylinder or replce, try bleeding brake system too. Ceck if check valve is bad this is located on vacumm line from intake manafold to booter pump body. brake seal at check valve booster pump should hiss if not check vaccumm line for leaks if no leak in line replace check valve they don't cost much.
SOURCE: Buick Lesabre 1998, How you check the coil packs?
you can take them off and have them tested or you can pull the plugs and there should be two plugs that will be really black follow those wires back to the coil that is bad. or you could also have someone crank it while you stick a screwdriver in the end of the wire on the plug and hold the screwdriver next to the engine or a good ground and there should be a bright blue spark but be careful and dont touch the car or it might tickle a little bit
SOURCE: bad brake booster
If you know for sure that the booster has failed, you need to unbolt the master cylinder from it, (sometimes you can move it away enough to not even disconnect lines.) Then unbolt the booster from the firewall, disconnect the pedal linkage if connected to booster. Remove & replace booster assembly and everything else you you took off. If you didn't have to remove master cyl you are done. If removed, bleed master before putting back into service!
SOURCE: 1998 Buick Lesabre How do you test the coil packs?
the coils are one integrated block with 3 separate segments. the coil pack is mounted to the ignition module and can be unbolted from each other. one can test the coils from the underside of the coilpack with a dvom. having said that your car should still start if one paired coil fails, it would however miss on one or two cylinders. I would suggest to scan for codes, monitor live sensor data to see if you have a valid crank signal, check fuel pressure and spark voltage
SOURCE: Rear brakes need ajustment on Buick Lesabre
I don't know if this works on a Buick but I have had two cars that the auto adjusters worked when you used the parking brake, I rarely use the parking brake so I got in the habit of working the parking brake 20 times or so at oil change time.
SOURCE: how to replace a brake booster in 1995 buick
undo the the vacuum hoses and make sure you make a diagram of where each hose goes. move them out of the way.
undo the four bolts that attach the master cyclinder to the booster. use a wire coat hanger or just wire to support it. you don't want to bend or break the brake lines.
undo the four bolts that hold the booster to the firewall. carefully pull it away from the firewall. you will see a small are there with a clip. remove the clip and unhook the arm.
reverse those instructions to put it back together
However BEFORE you do that. Make sure that none of the vaccuum hoses are leaking.
please take a moment to rate this solution. thanks
robert
Testimonial: "appreciate your feedback soo much.i was afraid that i have to go under the dash on the inside of the car but your instructions are pretty simple.thk u"
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