where are the proportion valves located on a 1991 buick skylark?
the valves are on the brake lines before they break away from the frame, or at least they should be. They are controlled by the computer though.
definite they do pass undesirable! It sounds like this is your difficulty. you are able to attempt bleeding the proportioning valve with a brake bleeding gun, making optimistic to open each valve then re-bleed the brake gadget this would get rid of the potential for a air bubble in the proportioning valve. I even have replaced probable ten or twelve of those issues in my ventures.
Brake light staying on in the dash? The proportional valve, or transfer valve is a part of your brake system. Look directly under the brake master cylinder, there is a long square block of steel or brass, about 4 to 5 inches long. It will have two brake lines from the master cylinder going in, and two more coming out, going to the four wheels. In the middle, or one end, will be a wire attached. If your brake light on the dash is on, it means the valve shifted off center, because one wheel cylinder/caliper may have failed, or one of the two reservoirs in the master cylinder is out of fluid. Once you find out what the real problem is with te brakes, the system must be bled in a certain way to re-center the valve, so the light goes out.
