Question about 2007 Mercedes-Benz S550 Sedan

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Just replaced front brake pads on 2007 mercedes s550. I lost some break fluid during the change and now brake pedal goes to floor after repeatedly pumping. I do not have a leak, so my guess is I need to bleed breaks. Is this true and if so, how do I do it?

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  • waitesips Jul 29, 2010

    How do I bleed the brakes on my 2007 Mercedes S550? Where is the bleeder valve located?

  • waitesips Jul 29, 2010

    Very helpful

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  • Master
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The procedure is as follows:-- Buy a master cylinder cap from MB. Buy a NEW small presure sprayer at the garden department. Buy a hose to thread fitting for the cap. Drill a hole in the cap and put the fitting on TIGHT with a little epoxy glue to seal it. Fluid in the sprayer, wheels off. ope the bleader on the left front caliper. Gently pump up the sprayer until fluid oooses out of the bleader. do not over presure, just enough to ease the old fluid out.
Keep bleading until the fluid turns clear, then on to the next wheel until the job is done.
When finished keep the cap device by cutting the hose mid way, and THROW THE SPRAYER AWAY so that you will not be tempted to re use it when dirty next time. Make sure the fitting you buy has a nut on the back so you can really crank it tight on that cap, sealing it.
bleed the closest wheel first (shortest brake line) as suggested by service manual FrontLeft, FrontRight, RearLeft, RearRight. That is for pressure bleeding as well as the old manual way of pumping the paddle and opening and closing the bleed valves. But if you are using a vacuum pump to **** the fluid out at the wheels, then do the longest line first : RR,RL,FR,FL.
That is for LHD cars where the Master Cylinder is on the left side closest to the LeftFront wheel, so for RHD cars it would be the other way around.------------- There are two methods to exchange brake fluid; one is to force-feed fluid from the master cylinder reservoir through the system and out of the bleeders on the calipers. The other is to use vacuum to pull it out of the caliper:------ use a vacuum pump brake bleeding system; it consist of a hand operated pump and an inline reservoir.
The preferred way:
Place car on jacks and remove tires.
Open the master cylinder reservoir and, using the vacuum pump, remove all fluid and refill.
If the reservoir contains sediments: 
Refill the reservoir with clean fluid; agitate the fluid to suspend sediments, and empty again.
Refill the reservoir and agitate again, if sediments are visible empty again.
Repeat until the fluid remains clear.
Note: Most brake fluids will damage your paint; if you spill any, clean it up!
Many manufactures give a brake bleeding sequence; in reality it is not very important, you can  start with the brake furthest from the master cylinder ending up with the closest.
The next step is important: to prevent from ‘back flushing’ any dirty fluid, fist attach the vacuum pump to the bleeder, open the bleeder and pull about halve the amount in the master cylinder reservoir in to the inline reservoir. 
Refill the master cylinder reservoir.
With the bleeder still open, and, using a proper tool, force the caliper pistons in to the fully retracted position. 
Using the vacuum pump pull fluid in to the inline reservoir until it appears clear.
Important: Keep refilling the master cylinder reservoir to prevent air from entering the system.
Go to the next brake, attach the vacuum pump, open the bleeder, force the pistons back, pull fluid until clear and so on.
Important: After you are finished and all bleeders are secured, pump the brakes until pressure builds up; check the master cylinder reservoir and fill to the ‘Max’ Line.
The quick way:
Clean the master cylinder reservoir as above:
Select your first brake, attach the vacuum pump, pull fluid until clear; repeat for the remains brakes.
This will be as good, or better, as any shop will do for you.
Thanks. Keep updated for any more query. You can rate this solution and show your appreciation.

Posted on Jul 29, 2010

  • waitesips Jul 29, 2010

    Can you tell me how to locate the bleeder valve?

  • waitesips Jul 29, 2010

    Can you tell me where the bleeder valve is on the caliper? I just want to make sure I have all my i's dotted and t's crossed before I pull the right front tire and start the bleeding process.


    thanks

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  • Master
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You need someone to help you.
Pump the brake several times and then hold it to the floor.
Open the bleeder valve on the caliper at the right side wheel. Air and fluid will come out. Close the valve.

Repeat the above procedure till no air bubbles come out with the fluid. Make sure the brake fluid reservoir does not get too low and lets in more air.

If after doing the right side the brakes are not normal, repeat the procedure with the other side. You don't have to do the rear brakes if you didn't change them.

Posted on Jul 29, 2010

  • waitesips Jul 29, 2010

    Where is the bleeder valve located?

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You've done major work and now you'll need to completely bleed air out of the system, to get the fluid to go all the way through. You may also need to adjust the rear brake shoes.

First, bleed the Master cylinder to get fluid through it. This should have been done before installation. Loosen the lines at the M. Cylinder and fill up the reservior with brake fluid. Pump the brake pedal slowly with the cover on the M. Cylinder to prevent fluid from splashing out. Once you've got fluid coming through the M.Cylinder, tighten the brake lines at the M. Cylinder.

Bleeding the brakes is a 2 person operation. You always bleed the brake the farthest from the master cylinder, then the next, the next, and finally the drivers front brake which is the closest to the M. Cylinder.

If you are unfamiliar with this process, you need to remember that you can't let the brake fluid get low in the M. Cylinder, or you have to start all over when air gets back into the lines.

When one person pumps the brakes, after several pumps hold the pedal down as far as it will go and keep pressing to the floor as the other person loosens the bleeder valve. Don't let off of the pedal before tightening the bleeder valve. Then repeat until all of the air is gone.
Teamwork and communication. Both of my wives were able to assist me in bleeding brakes.

You will have to add fluid and repeat this process until you have a firm pedal.

One man bleeder valves work if used properly, but who tells you what is happening at the other end while you're pressing the pedal?

Good luck.

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Changed brake pads and now I have no brake pressure


you may need to bleed your breaks so check your fluid and have a friend help you with this.. open or take off break fluid cap and top off with fluid leave cap off and start on the back passanger side break have someone pump the break a few times and then hold down on the break pedal while you open the bleeder valve when the break pedal reaches the floor hold there and retighten the bleeder valve and repeat untill no air only fluid comes out, then move to the driverside rear wheel and repeat,next is the front passanger side wheel then finaly front driverside wheel. check fluid in master cylender after every 2 trys on each wheel to make sure pleanty of fluid is in resourvior so your not putting air in the lines.. you should see a video on this to make sure you understad it fully before attempting yourself, go to youtube videos and watch a video on how to bleed breaks almost all break systems are the same. i hope this helps.

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I replaced the front brake pads,I need to know how to bleed the front line.


remove master cylinder cap and fill with brake fluid.
start at back passengers rear , helper pushes brake pedal 3 times. you or whoever losens zert with. small wrench. bleeds air pedal pushed to floor. repeat .
switch to driver rear brake . repeat couple times
then move to front and do same, starting also with passenger side first.
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post me of any development

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