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What size allen wrench is used to remove the slide bolt on the front brake calipers of a 2008 mercedes ml 550?

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  • dtraderd Aug 03, 2010

    I know how to change it . i need to know the size of the specific allen wrech for the job



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To replace a Brake Caliper and all the components for 2008 Mercedes Benz Truck ML550 5.5L SFI DOHC 8cyl you need the next tools list:
1. Combination Wrench Set
2. 3/8 in. Drive Ratchet
3. Floor Jack
4. C-Clamp
5. Mallet Hammer
6. Flat Head Screwdriver
7. Socket Set
8. Jack Stand Set
9. Tire Iron
10. 1/4 in. Drive Torque Wrench

Also can check this GUIDE.

Good luck.

Posted on Aug 03, 2010

  • ZJ Limited
    ZJ Limited Aug 03, 2010

    I think that's it...


    - 12mm socket with extension (2 right caliper bolts)
    - 6mm allen/hex bit socket (two left side caliper bolts, 4 front axle pinch bolts)
    - 17mm allen/hex bit socket and 22mm wrench/socket (front axle)

    Medium anti-seize on caliper bolts and caliper stopper bolt.



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Jack up the left front and put a stand under it, then remove the wheel. Turn the wheel all the way to the right
On the back of the caliper you'll see 2 female hex bolts(allen head) the size should be 5/16 or 3/8, use a
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I have a 2000 Passat and going to have my friend replace the rotors and breaks. I am preparing to fix it but want to know what sizes are the bolts for the calipers sliding pins. If you know the Bolt s

For a wrench or for the acctual bolt size.
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So this is what it takes to replace rear brake rotors on a 2003 Mercedes E320;
1) open the bonnet (hood) of the car and loosen/remove the cap off of the brake fluid resevior.
2) remove outer spring clamp from brake assembly (it clips in to the iner edge of the holes of the caliper).
3)using a 7 MM allen wrench, remove the brake caliper.
4) using 18 MM box wrench, remove the caliper housing assembly off of the wheel hub.
5) using a star wrench, unscrew the rotor locking screw from the rotor
6) squirt some liquid wrench on the rotor hub and knock the rotor with a hammer to work the liquid wrench in.
7) using the same hammer, knock the rotor off the hub.
8) using a metal file, lightly file old residue off of the hub and place the new rotor on the hub.
9) set the hub by screwing in the lug nuts and then screw in the hub locking screw using the star wrench, then remove the lug nuts.
10) reinstall the caliper housing assembly onto the wheel hub using the 18 MM box wrench.
11) push back the brake claiper piston to its home position and install the inner brake pad (the one with the snap clips)
12) insert the outer brake pad in the claper housing assembly.
13) slide on the caliper housing with the inner brake pad in place (over the outer brake pad) and screw in the caliper screw rods using the 7 MM allen wrench
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This proposed solution is for a 2003 Mercedes Benz E320 and NOT a 2005 model as stated by the limited option selection provided by when initially describing the problem.

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1 Answer

What size wrench to use to remove brake calliper


If we're talking front calipers then lot of Fords have allen bolts holding the calipers in place rather than conventional bolts.

There's two on each caliper, and each one is inside a deep rubber sleeve with a plastic pop out cap on them (if the caps are still there of course!), so basically, you need to pop the plastic caps out of the rubber sleeves and then find an allen (hex) key to fit the allen bolts, and then you're good to go, but you'll need a longish handle on the hex key and get some anti-sieze spray on there because the slides may put up a fight.

Very best regards


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