W124 brakes are easy -- jack up, remove wheel, remove one bolt on the
sliding caliper, life the "loose" half up and away on the other
slider bolt (which stays in) and lift out the pads. Push single
piston back in, flush fluid if you want, put new pads in place, lower
caliper half, install new (included) bolt and you're done.
Things to watch for:
You need a wrench to hold the pin the small bolt goes into. 14mm I
think. Otherwise you will turn it forever and it won't come loose.
Make sure the bellows on the pins are good, and that there is no play
in the sliding part. Major annoyances if there are, but you can just
buy the pin and bushing kit and replace them. Replace the bellows if
torn.
Watch that the little "ear" springs on the top of the pads stay under
the sliding caliper, and don't stick up through the slot. Major
rattles, squeals, and hassle, and they DO pop up where they don't
belong.
Don't break the little plastic cover for the sensor wire, you really
need to compress the coiled section and install it under the cover.
If it's pulled out, it can rub through and give false worn brake
indicator illumination.
You must remove the calipers to replace the rotors, but they are
usually fairly easy -- just take out the small hex socket screw and
they SHOULD come off. Usually have to "help" them off a bit as they
stick. Put a THIN coating of anti-seize on the face of the hub after
you clean off all the old rust. Rotors must have the coxmoline
removed -- brake parts cleaner works great.
You MUST roughen up the new rotors -- they are turned and you need to
sand them with coarse paper enough to cross-hatch the spiral left --
otherwise they moan and groan under light pressure essentially
forever. This can be done by hand, but a flap sander works better.
Change the brake fluid if you don't know how long it's been.
Peter
On May 9, 2009, at 6:26 PM, E M wrote:
Thanks Alex. This is my first brake job on this car. I had a
mechanic
check them last Fall and he said should be fine for a year, but I
bought new
rotors, pads and sensors, well, one sensor, lol, and will just
change it
all. I tend to pull wheels a couple of times a year too, just to
have a
look at things.
Any tips or things to watch for when taking it all apart ??
Thanks
Ed
300E
2009/5/9 Alex Chamberlain <apchamberl...@gmail.com>
There's no harm in leaving the wear sensors off if you want to change
the pads before you get the other one from Rusty, Ed. I kind of
figure they are not worth the bother, since I look at the pads
twice a
year anyway (at least) when swapping winter/summer wheels.
Alex
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