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#1
08-30-2006, 05:46 PM
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Brake pedal spongy- air in system?
Just replaced the front brake pads on my 116 and when I went to pump the pedal to push the pistons against the new pads I wasn't feeling much resitance- then realised I'd left the cap for the master cylinder slightly open- now the pedal is spongy- does this sound like air in the system? And will I need to bleed the whole system? The discs are quite worn and will need replacing shortly, so I was thinking maybe the pads weren't quite bedding against them properly?
When I reversed out of my parking bay I had to use the handbrake to stop the car as I had hardly any power- then I took it for a short road test and it slowly started to feel more normal, but still too much travel for my liking.
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1993 320TE M104 --------------------------------------------------- past: 1983 230E W123 M102 1994 E300D S124 OM606 (x2) 1967 250SE W108 M129 1972 280se 3.5 W108 M116 1980 280SE W116 M110 1980 350SE W116 M116 1992 300E W124 M103 1994 E280 W124 M104 ---------------------------------------------- "music and women I cannot but give way to, whatever my business" -Pepys 
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#2
08-30-2006, 06:46 PM
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It's not worth guessing. Dangerous.
Take it to a shop and have the brakes bled. New pads require a bedding process. Normally 5 to 8 gentle stops from say 60 mph with time in between to cool. Normal for reduced braking at initial backout just after replacing pads, but not long. Steve
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#3
08-31-2006, 12:05 AM
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i bet you have an empty rear chamber on the master cylinder resorvour.
tom w
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.  [SIGPIC]..I also have a 427 Cobra replica with an aluminum chassis.
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#4
08-31-2006, 03:31 PM
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450 brakes
if both the reservoir chambers are full you will find that you have a wear lip on the rotors and part of the brake pad needs to wear down because the rest of the pad is only lightly touching the rotor.all that you have described confirms this condition.
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David S Poole European Performance Dallas, TX 4696880422 "Fortune favors the prepared mind" 1987 Mercedes Benz 420SEL 1988 Mercedes Benz 300TE (With new evaporator) 2000 Mercedes Benz C280 http://www.w108.org/gallery/albums/A...1159.thumb.jpg
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#5
08-31-2006, 04:15 PM
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I agree, that lip can create the impression of air in the lines. Another reason to get the rotors turned, if at least to get rid of the lip.
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08 W251 R350 97 W210 E320 91 W124 300E 86 W126 560SEL 85 W126 380SE Silver 85 W126 380SE Cranberry 79 W123 250 78 W123 280E 75 W114 280
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#6
08-31-2006, 11:14 PM
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Where is this rear resrvoir?
Im having this same exact problem on my 300CD accept that theres play to an extent that does nothing. (i can press the brake and nothing happens at all) but once i get to that point the brake catches pretty strong. Think it might be something with the brake-booster? i tightend a loose conection today and it seemed to help a little bit, but didnt have time to check it out on the road.
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'83 300 CDT '82 300 CDT- flooded and locked up, looking for new engine '81 380 SL - Sold '86 300 E - small probs.. 60k miles.. great condition overall
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