BMW 34116864058 Brake Disc, Ventilated

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It is recommended always to have in mind some preventive measures and prohibitions before beginning to work. If one brake disc is worn out, the other one should be changed at the same time as new brake pads should be also fitted for an equal and proper operation of the brakes. First, engage the parking brake and then safely lift the front part of the car by installation of interstate jack stands, then before continuing remove the correct front wheel. If need be, that is, if better access to the rotating brake disc is required, the brake pads can be removed by pulling them out from the brake disc. Light scoring is expected, but if the surface gets heavy scores or cracks then it has to be replaced. Rust and brake dust often develop a lip around the circumference of the disc and, while this can be scraped off, if the lip is due to excessive wear, use a micrometer to measure the thickness at several points along the disc's edge. If the disc has worn to the specified minimum thickness or less, it is required that it should be changed. Warping can also be detected by run out, that is by checking on the dial gauge or blades of feeler and if it is high then the discs have to be replaced and it will be advisable to check on the hub bearing. Check the disc for cracks and other wearing out signs and replace with if it is worn out. For removal, you will have to remove the bolts that hold the brake caliper mounting bracket to the steering knuckle then push the caliper assembly off the disc and hang it on the front suspension coil spring so that the hydraulic brake hose is not under strain. Undo and withdraw the screw that bolts the brake disc to the hub and take off the disc and if you find that the rear face of the disc is tight tap it gently. Removal is done in the reverse, with especial attention paid to the state of the mating surfaces; the disc is placed onto the hub and the retaining screw intentionally tightened to the recommended torque. If a new disc is installed, remove all preservative coating before fitting the caliper and the last preceding must fit over the disc with pads above and below. Secure the caliper mounting bolts to a torque stated for the model, and then fit the wheel, drop the automobile and finally fasten the wheel bolts to the required torque. Last, gradually press the brake pedal till it attains its normal force, this is through successive depressing of the same.

Insert a screwdriver through one of the wheel bolt holes in the brake disc and rotate the adjuster knurled wheel to retract the shoes, allowing the brake disc to be withdrawn.