1994 Cadillac DeVille Q&A
1994 Cadillac DeVille Question: Back brakes will not work?
Your car has drum brakes rear and disc brakes front. For safety the system has a front rear brake split in case of brake failure in the front or rear brake system The car splits the brakes in the case of hydraulic failure using a Pressure Differential Pressure Warning Switch and Valve. Have you no fluid at either rear wheel? I wonder if the proportioning valve is seized and not allowing fluid to the rear. Locate the proportioning valve get someone to press the brake pedal, crack open the brake line going in to the proportioning valve and see if you have pressure, if not the problem is forward of the proportioning valve. If you have pressure going into the proportioning valve crack open each line coming out of it. With all four wheels at ride height with the brake pressure applied to the brake pedal each line should bleed out pressure when you crack open the line if not the proportioning valve is bad. If you have pressure coming out of the proportioning valve ensure the wheel cylinders are not seized but you said you don't have fluid getting back there. - patrick mannion
See if your Caddy has ABS. If it does, then you need a scanner to bleed the brakes. I have run into this problem and when ever I deal with GM vehicle with ABS I have to use a scanner to bleed the brakes or I never get any pressure. i have seen other folks replace Master Cylinders etc until they realize that they need a scanner any time they work on the brakes on a GM car made after 1990. Especially if you ever leave the key on while bleeding or working on the brakes. This drives the ABS system crazy. I hope that this helps. Good Luck. By the way, the is an ABS capable scanner not just a little one from a parts store. Dear CadillacLover, Do you have ABS in your Caddy? we need to firmly establish this first. The typer of scanner I am taking about costs $3000-4000, minimum. It is really for shops. But before we worry about that, lets make sure that you have ABS brakes. You can tell if you turn on your key with out starting the engine and there is usually an ABS in yellow letters next to your battery light etc. Good Luck! Ok, since you do have ABS, you need an ABS capable scanner to correctly bleed these brakes. There is actually a brake bleeding menu on the scanner that opens up the ABS valve body. Also you need to make sure that your rear caliper parking brake functions are correctly adjusted before you attempt to bleed the brakes. If the brakes still won't pressure up with a scanner, the ABS valve body maybe really dirty so the valves won't seat correctly. In some cases this valve body has to be replaced, but let's stay positive. Good Luck - dandd
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