Shatzy Posted September 16, 2011 Report Share Posted September 16, 2011 Drove the car last week and noticed the brake pedal faded almost to the floor; this happened a few times before I got the car home that day. checked the master cylinder, but it was only sightly low, and not enough to call for adding fluid. Drove the car a week later, and no problem. No sign of a leak on at the MC, booster, on the firewall or on the garage floor.One mechanic told me the master cylinder was probably leaking inside, and that I should replace it before fluid backed up and it damaged the booster. Another mechanic drove the car, said the brakes seemed OK, and told me I probably had an air bubble in the line that has since resolved itself. Any suggestions? Link to comment Share on other sites More sharing options...
Extortion00 Posted September 16, 2011 Report Share Posted September 16, 2011 Only Times I Ever Had Problems With My Brakes Like That Was When I Had Air In The System Link to comment Share on other sites More sharing options...
BodybyFisher Posted September 16, 2011 Report Share Posted September 16, 2011 Its caused by heat See this http://en.wikipedia.org/wiki/Brake_fade Brake fade is caused by a buildup of heat in the braking surfaces and the subsequent changes and reactions in the brake system components and can be experienced with both drum brakes and disc brakes. Loss of stopping power, or fade, can be caused by friction fade, mechanical fade, or fluid fade. Brake fade can be significantly reduced by appropriate equipment and materials design and selection, as well as good cooling. Fade can also be caused by the brake fluid boiling, with attendant release of compressible gases. In this type of fade, the brake pedal feels "spongy". This condition is worsened when there are contaminants in the fluid, such as water, which most types of brake fluids are prone to absorbing to varying degrees. For this reason brake fluid replacement is standard maintenance (we just had this conversation on another thread about changing the brake fluid) 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...
Ranger Posted September 17, 2011 Report Share Posted September 17, 2011 If the pedal sinks to the floor and you can pump it up, you have air in the system and need to bleed it, but if it still sinks after you pump the brakes, then the master cylinder is leaking internally and needs to be replaced. Link to comment Share on other sites More sharing options...
Texas Jim Posted September 17, 2011 Report Share Posted September 17, 2011 What Ranger said.... Link to comment Share on other sites More sharing options...
BodybyFisher Posted September 17, 2011 Report Share Posted September 17, 2011 yes, this seems to be a master cylinder, I neglected to read your entire posting, and assumed it was due to FADE, this is not fade 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...
PurdueGuy Posted September 18, 2011 Report Share Posted September 18, 2011 These are very fun to replace. I am not the best shade tree mechanic but I spent hours up side down in the drivers seat replacing one of these. Link to comment Share on other sites More sharing options...
Ranger Posted September 19, 2011 Report Share Posted September 19, 2011 The master cylinder is under the hood and all work is done from there. You replaced something else. Vacuum booster perhaps? Link to comment Share on other sites More sharing options...
rockfangd Posted September 19, 2011 Report Share Posted September 19, 2011 well masters under the dash arent unheard of but not on a cadillac. did the one on my Deville and my scottsdale and both were easy. best tips Dont go cheap on brake parts, and bench bleed it well. I have bench bled 95 percent of the air on new units without haviing to crack any bleeders GM FAN FOREVER Nice, clean, luxury= fine automobile Link to comment Share on other sites More sharing options...
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