Question about 1991 Lincoln Mark VII
I have not heard of an ABS causing these problems. Usually, a loss of pressure is a hole in a brakeline or a bad master cylinder.
The first brakelines to leak on my 1988 Bill Blass where those going under the engine. Check in the frame where the lines are routed from the ABS to the front brakes.
I use a Vacuum Handpump Bleeder. As long as there is fluid in the Master, you should eliminate the air. If you have a leak when you draw down each wheel you may hear a whistling, deflating ballonlike sound of the air draw. My handpump has a gauge which will show a pressure drop.
Or you can go the other direction and disconnect the ABS lines to the wheels. When you draw the vacuum from the closed Calipers, there should be little air in the lines. However, a hole in the line will continue to drop the draw from that particular wheel Caliper. This would prove you have an opening in the line.
Posted on Oct 11, 2010
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Posted on Jan 02, 2017
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