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The pad removal process in this guide is performed with the caliper off of the vehicle. The installation process is documented with it on the vehicle. Both procedures can be done with the caliper on the vehicle. The calipers were off of this car for cleaning, since the soft rubber hoses were being replaced too.
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You'll need to remove your wheels to perform this work.
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The first step is to remove the brake pad wear sensors. First, disconnect them from the sensor harness bolted to the caliper.
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Then use a needle nose plier to remove the sensors from the old pads. The wires may break as they did on this set, but you can still grab the sensor body to remove it.
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These sensors cannot be re-used. They should be replaced with the pads.
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Next use a punch and hammer to tap the pad spring retaining springs out of the caliper.
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Note that there are several styles of springs and pins, depending on the brand of caliper and the age of your W123. Some pins have cotters holding them in place that you would need to remove before punching them out. See the rear brake pad replacement guide to see this style.
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Once you have punched the pins out part of the way they may be pulled the rest of the way out with a needle nose plier.
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With the pins removed the pad retaining spring will come free and can be set aside.
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Note that it's possible this spring is under some tension and could pop out.
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The old pads can now be slid out of the caliper. With the caliper off of the car they can slip out either direction. With the caliper on the car they will only slip out away from the brake rotor.
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If your pads look this dirty and rusty upon removal, consider removing the calipers for inspection and cleaning.
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Now that the pads are removed you will need to move the pistons in the caliper back so that the new, thicker pads will fit in.
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First, you should remove a bit of brake fluid from the system. As the old pads wore down, there was room for more fluid in the system and the level was likely topped off. With the new thicker pads in place there will be more fluid in the system that there is room for, potentially.
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Begin with this process by removing the cap on the brake fluid reservoir.
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Suction out a few ounces of brake fluid. You can use a suction tool as shown, or a clean turkey baster. Just never use the turkey baster in the kitchen again!
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Do not suction the reservoir dry! You would need to bleed the system if this happens.
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With some fluid removed and the top left off of the brake fluid reservoir, use a large pry tool to gently pry the pistons back in to the body of the caliper.
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Always use the flat surface of the pry, never the tip, and try to push the piston back in as straight and evenly as possible.
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Alternately, you can purchase the proper brake caliper piston compression tool from Mercedes...but this pry bar technique works if you are careful.
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Repeat this on all four pistons. Watch the brake fluid level as your proceed to ensure it does not overflow the reservoir. Remove more if necessary.
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Cover the back of each new brake pad with a very light coat of brake pad grease/anti-squeal coating.
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Slide the pads in to the caliper with the pad material facing in towards the rotor.
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If the pads are not sliding in, try prying the piston back a bit further.
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The pads should be seated fully in to the caliper until they stop.
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Re-insert the pins as far as you can by hand.
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The pins should be on top of the retaining spring.
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Tap them in with a hammer, finishing with a punch to get them all the way in.
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These pins are a compression fit. Your pins may have cotters that hold them in place. If you had to remove cotters in order to get the pins out, be sure to use cotters in the same manner when you re-install them.
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Then push your new brake pad sensors in to the holes made for them in the pads. There is one hole on each pad. Make sure the sensor seats in the clip on the top of the pad securely.
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Then push the tips of the sensor in to the sensor harness that is bolted to the caliper.
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Be certain to top off the brake fluid reservoir before driving, if necessary.
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