Air in the system
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If you have replaced the master, you have to bench bleed it first to get the air out. That done, master bolted on, you will then have to bleed the 4 wheels, till all the air is out. If you need more info, send me a msg. and I will go thru all the steps.
you forgot to plug in the brake fluid sensor.
Normally it means the master cylinder has failed and needs replacing. It can also be a leak in the system or the master cylinder is extremely low of brake fluid.
No, it more commonly causes soft braking.
There was no Caprice in 2004...
How to fix brake will not bleed out
A brake master cylinder? If you are losing brakes or brake fluid.
Replacing the master cylinder on any year celebrity is about the same as replacing a master cylinder on most any other vehicle. Use a flare nut wrench to remove the brake lines, put plugs in the lines to keep dirt out. Unplug the electrical connector if there is one. Remove the nuts that hold the master cylinder in place. Remove the master cylinder. Follow any manufacturers instructions on bleeding the replacement master cylinder as required. Bolt the new master cylinder in place, reconnect the brake lines and electrical connector. Bleed the individual wheel cylinders and calipers to insure there is no air in the system. Be sure to maintain the brake fluid level in the master cylinder while bleeding the brakes.
Most likely brake master cylinder.
If you are replacing make sure that you bench bleed prior to installation
try replacing the vacuum hose from the brake master cylinder to the intake manifold its a 1/2 in hose
Brake master cylinder repair is where someone or some body fixes the master cylinder on your brakes. It is the main line to your brake apparatus. Also the master cylinder is the container for the fluid and the piston, forming part of a device such as a hydraulic brake or clutch.
Master cylinder empty (no brake fluid) Leak in brake line or wheel cylinder Defective master cylinder