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Long brake pedal travel?

 
Old 01-24-2017, 09:21 AM
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2014 CLS 63 S AMG / 2004 E55 AMG
Long brake pedal travel?

I've had a high mileage (157k) 2004 E55 for 2.5 years now, and it has always had a lot of travel on the brake pedal, but recently it seems to have gotten worse. The car brakes fine, and when I press hard on the pedal, the car will lock up fine.

Do these cars naturally have a lot of brake pedal travel? Besides potential air in the lines, could a lot of pedal travel indicate a worn brake pedal?

Thanks for any input.
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Old 01-24-2017, 06:44 PM
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2007 Mercedes E63 AMG Pano, 2002 Audi A4 1.8t
lots of pedal travel would indicate air in your system. Pedal thickness should not play a factor as the amount of fluid displaced will be absorbed through the excess brake fluid in your reservoir. Air compresses with pressure, fluid does not.
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Old 01-24-2017, 08:29 PM
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2006 E55, 2005 C55, 2005 E320 Estate Sport, 2015 ML350
Check for codes, check fluid level and have the system properly bled and see how that goes.
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Old 01-24-2017, 10:08 PM
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The SBC system in the W211 uses a mechanical feedback electrically actuated brake system. You can have significant amounts of air in the system and the pedal travel is not affected. Thus the importance of proper maintenance.

In your case, it could be the "master cylinder". Either the spring or the rubber biscuit are worn out. See attached for functionality. This is *not* like the old-style hydraulic systems.
Attached Thumbnails Long brake pedal travel?-w211-sbc-light.jpg   Long brake pedal travel?-w211-sbc-medium.jpg   Long brake pedal travel?-w211-sbc-hard.jpg  
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Old 01-24-2017, 10:24 PM
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Thanks for helpful replies.
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Old 01-25-2017, 04:28 PM
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2006 E55 AMG
The brakes in my '06 do feel "softer", but they work fine once you get used to them. It's that way even after a major service that replaced the brake fluid.

When I was given a loaner by the MB dealer, I kept jerking to a stop in their parking lot as I got used to the more sensitive brake pedal of the '16 E350.
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Old 01-25-2017, 05:58 PM
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2004 E55
Originally Posted by bbirdwell View Post
The SBC system in the W211 uses a mechanical feedback electrically actuated brake system. You can have significant amounts of air in the system and the pedal travel is not affected. Thus the importance of proper maintenance.

In your case, it could be the "master cylinder". Either the spring or the rubber biscuit are worn out. See attached for functionality. This is *not* like the old-style hydraulic systems.
Thanks for this info. I've been wondering how the electro-mechanical interface works on the SBC. I have very spongy brakes that take a lot of travel before they "bite". New pads and rotors (along with a fluid change) are on the way, but I was wondering if the "master cylinder" could be affecting my brake feel.

Do you have a part number for it? Has anyone ever replaced this piece and gotten better brake feel from it?
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