gresmi Posted January 24, 2011 Report Share Posted January 24, 2011 Good morning everyone!! I was reading a post earlier today and read that the parking brake releases when the car is shifted into Drive. Is this true on my '91 DeVille?? It sure makes sense if it is the case. For years I have cussed how small the release was for the parking brake. I live in Kansas and it's flat...so I rarely use the parking brake. Actually, I don't think I have ever used it on purpose. But, there are times, when I'm getting into the car, I'll hit the parking brake by accident and my idiot light comes on. I have to search for the release to get it to turn off. I'm anxious to hear back!! Thanks for the help!! Greg Link to comment Share on other sites More sharing options...
BodybyFisher Posted January 24, 2011 Report Share Posted January 24, 2011 Yes, your parking brake is suppose to release when the car is taken out of park and put into gear If it does not, you need to check to see that vacuum is getting to the vacuum servo at the parking brake mechanism, I replaced my vacuum servo in my 91 Seville Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
gresmi Posted January 24, 2011 Author Report Share Posted January 24, 2011 Yes, your parking brake is suppose to release when the car is taken out of park and put into gear If it does not, you need to check to see that vacuum is getting to the vacuum servo at the parking brake mechanism, I replaced my vacuum servo in my 91 Seville That is great to hear!! It's Monday morning and I have already learned something new!! Thanks for the response, I'm anxious to try it out. I always thought I was missing something but never thought about putting the car into Drive. Greg Link to comment Share on other sites More sharing options...
BodybyFisher Posted January 24, 2011 Report Share Posted January 24, 2011 Yes that lever that you find way under the dash is only for emergency use, if for some reason it won't pop, If you have your owners manual, it should detail the parking brake operation Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
gresmi Posted January 24, 2011 Author Report Share Posted January 24, 2011 Yes that lever that you find way under the dash is only for emergency use, if for some reason it won't pop, If you have your owners manual, it should detail the parking brake operation No manual with the car. I would have looked there the first time I had trouble finding the lever. Link to comment Share on other sites More sharing options...
heitzman Posted January 24, 2011 Report Share Posted January 24, 2011 The vacuum diaphram in the parking brake release goes bad often, which will create a vacuum leak. Link to comment Share on other sites More sharing options...
gresmi Posted January 25, 2011 Author Report Share Posted January 25, 2011 Well, last night I gave the parking brake release a test...which if failed. Looks like I'll be searching for a vacuum leak. Link to comment Share on other sites More sharing options...
BodybyFisher Posted January 25, 2011 Report Share Posted January 25, 2011 Well, last night I gave the parking brake release a test...which if failed. Looks like I'll be searching for a vacuum leak. It is very easy to diagnose actually with the right tools. you can test the vacuum servo by using a hand vacuum pump (like a mighty vac) with a short length of hose on it and attach it to the vacuum servo. Set the brake, and gently apply pressure with the hand pump, it should pop if the servo is good watch out for your hands. If the servo is good, test for vacuum when you take the car out of park. Put a vacuum gage on the vacuum hose going to the vacuum servo, start the car in park, put the car in R or D, you should see the vacuum gage jump I had my 91 for 10 years and it had 125K on it, and the vacuum servo went bad once. It is cheap, but I looked at rockauto.com and did not find it, you may have to go to a dealer to find one. Its held in place by two screws, a little tight to get in there Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
rockfangd Posted January 26, 2011 Report Share Posted January 26, 2011 I cuss all the time with my 96. I have a broken cable at the rear so my pedal is so easy to push, anytime I ever have service done they can never figure it out. I need to pull the tiny release and manually pull the pedal back up. Maybe someday GM FAN FOREVER Nice, clean, luxury= fine automobile Link to comment Share on other sites More sharing options...
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