Bring to a shop that has an ABS scanner to determine the problem
have you checked your brake fluid??
Remove the tire and wheel from your 1998 Chevy Astro Van. Remove the brake spring and caliper. The brake pads will come off. Reverse the process to install the new front brakes.
Back off the brake adjustment, or back off the e-brake adjustment, or the e-brake cables are stuck. No need to open bleeders.
dry brake shoe/pad operating arm on rear brakes
There is no air brake endorsement. If you do not pass the written air brakes test AND complete your road test in a vehicle equipped with air brakes, then you get a restriction which prohibits you from operating an commercial vehicle which is equipped with air brakes. It is possible to have a Class A CDL with an air brake restriction.
slack adjusters are part of the brakes. they are ocated on the axle next to each wheel. they are used to adjust the brakes,or to take the slack out on the lickages so as the brakes do not have accesive travel when applied The slack adjuster is the link between the operating rod in the brake chamber and either the S-cam (if you have drum brakes, which is what most of us have) or the power screw (if you have disc brakes) on an air brake system. The "adjuster" part is because the friction material wears out, and you've got to make the linkage longer as it does so the truck will stop properly. (Slack adjusters have been automatic for a long time now.) In operation: you step on the brakes, or you pull the brake valves on the dashboard. The operating rod pushes out, which pushes the slack adjuster, which turns the S-cam, which pushes the brake shoes apart and stops your truck.
The brakes could be binding or a caliper could be sticking. Remove the wheels and make sure that the brake system is operating properly.
On a US licence, there is no air brake endorsement - there is only a restriction for CDL drivers from operating a commercial vehicle equipped with air brakes if they don't complete the written test AND road test in a vehicle equipped with air brakes.
A brake system brakes.
pad brakes are disc brakes, it's known as changing brake pads for disc setup and changing brake shoes with drum brake setup.
If the brakes are still operating normally, check the tail light bulbs.
Check the ABS Dump Valve. If not operating, little or no fluid to rear brakes.