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why are my brakes sometime stiff?
Sometimes the brakes in my Mercedes C230 Kompressor feel extremely stiff. this happens when the temperature is very cold (-15C or less). they also don't seem to work as well when this happens. after about 1 to 2 minutes the brakes go back to normal.
When ABS kicks in, you can feel the activations, when they get stiff it's just solid.
The symptoms of air in the brake lines are a spongy fleeing brake pedal that almost seems to go to the floor without doing much. this is quite understandable as air is compressible while liquids are not. the idea that air gets hard under compression makes no sense. like I said gases are compressible liquid is not. having air in my brake lines would mean that the pressure required for braking which is only deliverable by using liquids is not there. on top of that, the symptoms I'm feeling are completely the opposite to those of air in the lines. I'm feeling a lot more pressure, not less.
4 Answers
- ricebikeLv 68 years agoFavorite Answer
do you have a vacuum booster behind the brake master cylinder? maybe that's what they're talking about
- Robert MLv 78 years ago
yoU SEEM VERY SMART EXCEPT FOR one thing! yOU must CHANGE YOUr BRAKE FLUID EVERY 2-3 YEARS AND USE only tHE genuine synthetic girling (MERCEDES) BRAKE FLUID. iF anyone HAS PUT ANY OTHER FLUID IN YOUR SYSTEM IT WILL CORRUPT THE SEALS AND MAKE THEM stiff! check THAT YOUR FLUID IS clear amber AND NOT SMOKEY DARK BROWN. sTICK YOUR FINGER IN THERE TO "feel" FO PARTICLES OF DISSOLVING SEALS O SATURATED fluids! HIS IS very important ON any car, BUT ESPECIALLY FOR European cars! Just One BAD FLUID ADDITION AT THE LOCAL quicky lube CAN RUIN A lot OF THINGS ON MANY CARS. sINCE THIS IS A compressor ENGINE YOU must USE ONLY specialty oil THAT IS AT LEAST mobil one 0w-40 OIL yOUR kompressor REQUIRE ATTENTION WITH GENUINE mercedes LUBRICANT AS WELL. read MANual aBOut thsi oiL MUST MEET THE BENZ 229.00 spec nubmers OR higher total nrgy OIL IS THE BEST AND THE FACTORY FILL WAS pentosin!<<<AS brake fluid AGES, It ABSORBS water! IN humidT EMPERATURES IT WEARS OUT faster< TURNS INTO sludge AND LIQUID SANDPAPER AND THEN YOU HAVE lots Of EXPENSIVE PART REPLACEMENTS TO DO. IT is best TO prevent TROUBLE WITH A PROPER power flush AND FILL OF THE BRAKE FLUID. good luck andKEEP THIS always IN MIND. fresh FLUID WILL restore PROPER "FEEL" TO YOUr BRAKES, and A GOOD motor flushing WILL INSURE PROPER vacuum TO tHE BRAKE BOOSTER WHEN alL THE SLUDGE IS REMOVED. good luck to you!
Source(s): YOUR fludi is breaking down. TEMPERATUR changes virtually prove this. BRAKE FLUID spoils just like OIL goes bad with time. GOOD LUCK! - ?Lv 48 years ago
You have air in the system.I would check the fluid level.If you ever went low and added fluid you can get air in the system.
all 4 brakes have to be bled.Air gets hard in cold when compressed.
