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· Registered
28 Posts
Discussion Starter · #1 ·
I changed the brake pads, all four wheels, on my 2001 S430.
Unknown to start with, by mistake I opened the four bolts on caliper. Break fluid leaked out. I closed it. Then changed pads proper way. But the brakes don't work. Pushing it all the way down to the floor applies just a little brakes. May be air trapped into the break line. How do I fix this? Please help. Thanks.

· Registered
1995 E320 (totalled) 91 420SEL W126 (retired) 2002 S500 W220(retired); 2008 C300 Sport W204
662 Posts
You probably will have to have it towed somwhere to get them bled properly.

Not sure with this system, but you can try this:

you will need an assistant
Remove cap on master cylinder
Jack up rear of the car put on stands.
remove both rear tires
Starting at the farthest brake from the master (passenger rear)
Have assistant pump 2-3 times then press brake down and hold.
Open bleed screw until fluid comes out (hopefully some bubbles will come out first)
Close bleed screw first, then have your assistant let off of the pedal.

Repeat process with driverside rear, then passenger front, then drivers front.
If required top off brake master with correct brake fluid.
Even if this does not work, it won't hurt anything to try it.

· Registered
Current 2017 GLE350, 2007 S550, 2002 S430, 1998 ML320 Deceased 74 240D, 92 400E, 97 E420, 13 GLK350
1,980 Posts
Bleeding Brakes

Sorry to hear your problem, but you definitely do not want to drive the car in this condition. I have bleed my S430 brakes in a different manner which utilized a vacuum pump at each caliper. Try a MB compatible brake fluid of a different color to help gauge when to stop pumping. Also, you will get tiny bubbles flowing even after the bleed. If all, is well, this is just air bleed by from the tygon hose. Brake reservour cap must be off during this method but don't let it go empty. You can get a vacuum pump at Autozone for about $50 (comes with catch bowl and tubing), and it eliminates the need to have someone 'pump' the brakes, or getting a power bleeder. Bleeding the brakes any any manner means you may avoid a towing fee and indy charge. Good luck for whatever method you choose.
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