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Home > Tips and Howtos > Benz DIY Project Tips Tips and Howtos

W124- DIY Brake Job (maybe applicable to other mo... [Benz DIY Project Tips]
Requested and Answered by Admin on 05-May-2005 05:19 (6633 reads)
W124- DIY Brake Job (maybe applicable to other models)
Submitted via email:

1. Open the filler cap on the brake fluid container;
2. puch a good screwdriver into the opening in the brake calliper and pry both pads away from the rotor as far as they will go, but check to make sure the fluid doesn't flood out of the container. Draw exess fluid with a syringe;
3. with a 17mm socket wrench, reach behind the assembly and undo the two bolts securing the calliper to the bracket on steering knuckle (which is attached to the shock absorber; the calliper itself is of two halves, the bracket should stay attached to the steering knuckle.)
4. pull off the calliper and suspend it on the shock absorber with a piece of wire or a rope. Just make sure you don't let it hang by the hose under its own weight.
5. take off the old pads. (DO NOT use compressed air to clean anything! Enhaling brake dust can cause you canser! Use water instead!)
6. fit two wheel bolts to the hub, use a big screwdriver or a craw bar as leverage between them, then undo the 5mm Allen-head bolt securing the rotor to the hub, and pull off the rotor (you will need a new bolt on installation.)
7. fit the new rotor and tighten the new Allen-head bolt.
8. fit the new pads, making sure you put them in place with the correct orientation. (the bracket will keep them in place.)
9. refit the calliper over the pads and tighten the bolts.
10. open up the little plastic cover securing the brake wear sensor, undo the 10mm bolt securing it in place, and pull out the old sensor.
11. press in a new sensor, and secure its plastic end into the recess on one of the brake pads.
12. refit the plastic cover.
13. check the brake fluid level and top it up if necessary. Push the rubber button on top of the container and make sure the light in the dashboard comes on. This will indicate of the wear sensor circuitry is working or not. It should be working!

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