Re: Question on rotors (archive)

Hi, actually it is not a difficult job. I think getting the correct parts is the most important thing. I don't know if the 740 uses two different types of rotors (diameter and thickness) and consequently also different types of pads. Take a wheel off and look and measure. Rotors are either 302mm diameter or 324mm. This is just from memory!

Get a new sensor, there is only one type. take pads out according to Bentley. Push piston(s) back after opening top of brake fluid reservoir. Unscrew mounting nuts of caliper, supend calipers and a wire hook (coat hanger). Don't let them hang on the rubber hose. Unscrew the 6mm? Allen nut that holds the rotor. Take rotor out and discard. Clean new rotor from oil etc. I usually use gasoline and a clean rag. Clean the surface on the hub. I use a electrical power wire brush and apply ssome anti size (copper paste) Install new rotor, use a new nut if available. Reinstall caliper preferably with new bolts. There are bolts precoated with Loctite or similar. They thread looks blue or red. Or use wire brush and aplly Loctite. Torque as required!!. Insert pads, attach sensor after or before. Reinstall wheel. Close reservoir lid.

Important: Apply the brakes a couple of time before actually starting the car and driving it!!!! The pistons you have pushed back into the calipers have to be moved back and the pads have to come in contact with the rotor surface. Otherwise you first stop will be a something solid. Don't forget all the usual safety precautions (jacks, gasoline,fire/smoking etc.)

Basically changing rotors or pads is a piece of cake. Takes maybe one hour for the front end if you take your time. Expect very dirty hands and very very tight bolts/nuts.

Have fun, Ekkehart

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