I have a 2007 Cadillac DTS. Occasionally while driving and coming to a stop the brake pedal goes almost to the floor. And when stopped the front end sometimes rocks back and forth.
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check your booster were the master cylinder is bolted .that large round thing.and the rubber hose going to it as can be leaking air. but check the sliders on your back brakes may be sticking and need taken off and cleaned.
The front portion of the reservoir has fluid used for the front brakes which provide the majority of the vehicles stopping power. There is a valve that is supposed to shift to isolate the front and rear brakes when this occurs but it doesn't always work as designed. You have lost all the fluid in the front brake system. This is due one of these possible issues:
Broken brake line
Broken brake hose from line to caliper
Leaking caliper seal
You need to find and repair the leak, refill and bleed the front brake system to get the vehicle back in service. IT IS NOT SAFE TO DRIVE IN ITS CURRENT STATE!!!
first check on every wheel make sure you see no wet . from brake cyclinders leaking. make sure brake fluid is full. when you replaced master cyc. did you bleed that before you hooked lines to it if not do that. abd bleed all brakes again. if still pedal goes down then it is the brake booster its self. hope this helps.
Yes sounds like serious problem, especially the harder to stop, If you mean the car just isn't stopping as fast and included with the pedal getting closer to the floor sounds like you have a brake fluid leak. Might be leaking from a line maybe the master cylinder or caliper or wheel cylinder, any which way probably should get checked out.
You gotta bleed your brakes and get all the air out dude. Then put in new brake fluid. Afterwards, make sure to pump the hell out of your brakes to build up brake pressure before you put this thing in drive or you will end up in the neighbors fence or a tree will stop you.
Presuming you have NO leaks in the hydraulic system,it would be a bad brake master cylinder.What's happening is,the piston inside the master cylinder has rubber seals,and when the pedal goes to the floor,the master cylinder is leaking internally,past the rubber seals.If the brake booster was bad,the symptom would be an extrememly HARD,unresponsive,brake pedal,and the engine would idle terrible (vacuum leak).Good luck.
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