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Old 08-25-2005, 10:30 PM   #1 (permalink)
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Write up on brake pad change

Got around to doing my front brake pads today. Extremely easy to do, took about 15 minutes per side (not counting time spent jacking car up and getting the wheels off).

A note, do each side one at a time. You don't want the pistons to compress without anything stopping them.

First off, spray the area down with some brake cleaner. Try to avoid getting any rubber bushings wet with the brake cleaner, it just isn't good for them. You'll probably find out that your calipers are kind of shiny, not the black you thought they were (unless I stripped some coating off... hmm). Also, it's a lot easier to do this job if you turn the steering wheel, so that the caliper is sticking out (less time spent squeezing into the wheel well to access it from behind).

Now you need to remove the brake pad wear sensors. Needle nose pliers do the trick.



Using some sort of punch and a hammer to pop the pins out. It's really easy to do if you can hold down the anti rattle clip with something.



After I got them through about half way, I just used pliers to pull the pins out. The anti rattle spring should pop out once the pins are gone.




Using some nicely sized channel locks, push the pad back away from the rotor. This makes it really easy to pull the pads out without damaging the dust shield around the piston.



Grab some pliers and yank the pads out, should slide out easily.




Grab the new pads and some brake pad grease, and apply a bead around the edges and back of the pad




Fit some tubing over the bleeder screw and make sure it goes vertical, up from the caliper. I used this handy little device with a magnet on the back. Couple bucks at the local auto parts store. Crack open the bleeder screw. This makes it a lot easier to compress the pistons without letting air enter the system.




Now grab those channel locks again, and with the bleeder screw slightly open, compress the pistons so they go all the way back in. Using a large, dull flathead screwdriver also helps. Be mindful of the dust shields.




Insert one of the new pads. If it's too large, try compressing the piston more. Try not to force the pad in if you don't have to.




Repeat again for the other side. Remember to close and cap the bleeder screw.




Replace the anti rattle clip and two pins. It's very easy to insert the two pins if you hold the clip down with something. Might have to fiddle around with the pads location a bit if the holes don't line up perfectly.




Put the wear sensors back in, throw the wheels back on (with proper torque!), lower the car, and you're all set.





Good luck!
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Old 08-25-2005, 11:24 PM   #2 (permalink)
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RE: Write up on brake pad change

That’s cool – thanks for the great resource, dan; you did a great job with the new pads.
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Old 08-26-2005, 01:44 AM   #3 (permalink)
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RE: Write up on brake pad change

Great instruction for the DIY'er. There are some members here that should really read that.

While cracking the bleeder will make it easier to push the piston in, I never do so. I loosen one of the caliper bolts and take the other out and swing the caliper out. This allows access with a C-clamp. You have to be really careful around those piston seals though as you pointed out.
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Old 08-26-2005, 02:30 AM   #4 (permalink)
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RE: Write up on brake pad change

The pins and the rattle clip along with the sensors,should be replaced. They are cheap,and using the old ones is Bush League.

John
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Old 08-26-2005, 05:05 AM   #5 (permalink)
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RE: Write up on brake pad change

Out of curiosity what kind of pads are those? I see they don't come w/ any anti squeal shims attaches.

Might I also recommend that people apply anti squeal paste to the back of the pad.. I'm partial to the Mercedes paste..keeps all my cars nice and Quiet:)

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Old 08-26-2005, 08:07 AM   #6 (permalink)
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RE: Write up on brake pad change

very nice pictures..

I have done lots of pads to the American cars..

I usually take the whole caliper off the rotors and change the pads this way...

I use a special tool that pushes the calippers back, and I open the top of the brake fluid under the hood so the fluid gets pushed back..

can I do the same thing with my car.. I mean this is strange changing the pads without taking the calipper off

very good job anyway
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Old 08-26-2005, 08:26 AM   #7 (permalink)
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RE: Write up on brake pad change

I did what Dan did to his, but the only difference was that I unscrewed the cap to the brake fluid reservoir and used a flat head screw driver to push the pistons in... one at a time. Its a real simple job.

any write ups for brake fluid change?[;)]
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Old 08-26-2005, 08:43 AM   #8 (permalink)
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Hey Danwatt

I turned your tutorial into a pdf file so people could download it .

i hope you don't mind.

kevin


you can download it here..

http://www.ourkitty.com/W126BrakePadReplacement.pdf
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Old 08-26-2005, 09:01 AM   #9 (permalink)
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RE: Write up on brake pad change

Excellent work Dan and Kevin...

This brings up a good idea... should I make a "DIY" sticky dealing with simple W126 repairs?
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Old 08-26-2005, 10:42 AM   #10 (permalink)
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RE: Write up on brake pad change

yes snibble

I suggested this idea some ime ago

some people have done excellent explanations of DIYs

sticky would be very nice...
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