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Old 04-10-2000, 09:33 PM
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Aaron Aaron is offline
Join Date: Aug 1999
Location: Cincinnati, Ohio
Posts: 1,935

This is definitely an "easy DIY'er". You will need a 17mm deep impact socket to remove the lug bolts and a 5mm allen head socket to remove the screw which holds the rotor to the hub. In addition, a 19mm to remove the caliper bolts and a 13mm and a 15mm for opening up the caliper to R&R the pads will be needed. The 13mm to unscrew the bolt and the 15mm to apply counterhold with. As far as pads go, I would imagine a set of PBRs or Mintex pads would be the best choice for using cross drilled rotors. Although, unless you do alot of autocrossing or track events, this setup really isn't necessary. Oh, I almost forgot, a pair of larger channel locks to squeeze the piston back into the caliper will also be needed. Ate makes a nice piston reset tool that works in a jiffy if you're constantly changing pads, but the channel locks will be fine for normal use. To change the pads and rotors, you will need to proceed as follows:

Jack up the car and remove the tire. You will see a top and bottom bolt which holds the caliper closed. Put your 15mm on the "inner" part of the bolt to apply counterhold and completely remove the "outer" bottom bolt. Do the same for the top except don't remove the bolt, just loosen it. You can then swing the caliper up and remove the pads. Next, you will want to squeeze the piston back into the caliper with the channel locks (remember to place a rag over the brake fluid resirvoir to abosrb any lost fluid!). Next, let the caliper back down and remove both 19mm bolts that hold the caliper on. Set the caliper out of the way and take the 5mm allen bolt out and the rotor will come off. Don't be afraid to use a little persuasion if it's giving you a hard time. You won't hurt the bearings. Next, prepare your new rotor for installation by spraying brake cleaner on the disc surface and scraping off the protective coating with a razor blade. Install new rotor and reinstall the caliper with the 19mm bolts. Apply some anti-squeal paste to the backs of the pads and place them into the pad guides. Lower the caliper housing down and re-tighten both upper and lower 13mm bolts remembering to use that 15mm for counterhold. Proceed the same for both front wheels. The backs are easier to do as far as replacing the pads. Rather than a floating caliper, they use a fixed one and the pads are held in by a spring clip and two pins. Knock the pins out with a 4mm drift pin and remove the spring clip. Squeeze the pistons back into the caliper using the channel locks on the edge of the brake shoe ears that the pins go through. Remove the caliper mounting bolts and R&R rotor in the same manner as the fronts. The rears might be harder to remove due to pressure from the parking brake shoes. To loosen the tension, you'll have to back off the star wheel inside the hub with a large flat blade screwdriver. Once the new rotors are in place, reinstall caliper and install new pads and spring clip and pins. Pump the brakes up until the pedal gets firm and check the fluid level in the resirvoir. If you need any further assistance, please don't hesitate to drop me an e-mail on the side. Good luck!

Aaron Greenberg
MB technician
Precision Motorcars, Cincinnati, Ohio
'67 250SE Cabriolet
'77 450SL
'80 300SD
'85 380SE
'89 420SEL
'93 300E 2.8
'74 Jensen Interceptor Mk.III
'81 DeLorean DMC12
'85 BMW 745i Turbo
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