Help bleeding air out of brakes please? - Mercedes-Benz Forum

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post #1 of 4 (permalink) Old 06-28-2012, 06:54 PM Thread Starter
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Help bleeding air out of brakes please?

Hello BenzWorlders,

I recently bought and assembled a pressure bleeder from MercedesSource. Today I pressure bled the brakes on my 99 w202 c280. Everything there seems to be fine, better than before in fact.

However, I used the same procedure for my 89 w124 300e and have a problem.
The brake pedal is really soft for more than half its initial travel and at the deep end of the pedal travel, there isn't as much braking as there used to be.

I suspect there is air in the system. How can I bleed the air out? Do I need more brake fluid? What do you recommend?

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post #2 of 4 (permalink) Old 12-31-2013, 06:23 PM
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I have one of Kent's brake bleeding pressure pumps and have used it on my R107, W126 and W201 with no problem.

You simply continue pumping the fluid through starting at the wheel furthest from the master cylinder. On a RHD car do the back left, then back right, then front left and then the front right.

Suck out the excess fluid with a syringe returning it to the correct fluid height in the master cylinder and ensure no air can get back in the wheel cylinders before you crank them up tight.


"That's the way I like it baby, I don't want to live forever"- Lemmy

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post #3 of 4 (permalink) Old 12-05-2014, 03:33 PM
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This sounds a bit like your master cylinder needs replacing.

was it like that before you bled them?
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post #4 of 4 (permalink) Old 03-13-2015, 09:15 AM
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The older cars used a single reservoir for front and back. There's a divider inside the reservoir, so that if one side of the system has a leak, the other will still have fluid. What I've found is that unless you fill the reservoir high enough to get over the divider, the rear brakes will be dry. This causes confusion, because the reservoir will look full, but you can never get the rears free of air bubbles. Keep the reservoir full to the very brim while bleeding, and then bleed it down to the fill line as your last step.
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