Genuine 1990 Audi 100 Brake Pad Set

1990 Audi 100 Brake Pad Set Parts and Q&A

• Q: How to replace the front Brake Pad Set on 1990 Audi 100?

  A: Firstly, apply the handbrake, jack up the front side of the car and place it on axle stands and take the front road wheels off. Although the wheels are removed, reattach in front of the hubs at least one wheel bolt to ensure that the brake discs are in place. Disconnect the wiring to the brake pad wear sensor and take it out of the caliper bracket, releasing it out of the lower guide bush cap. Unclip and pull out the pad retaining spring out of the brake caliper, and pull off the end caps of the guide bushes to reach the caliper guide pin bolts. Unscrew the caliper guide bolts and loosen the caliper by lifting it off the mounting bracket and use a piece of wire to join the caliper to the suspension strut to ensure that the flexible brake hose is not strained. Unscrew the inner pad of the caliper piston and take off its outer pad of the mounting bracket. Determine the thickness of the friction material in each brake pad; when either of the pads is worn to a certain minimum or below the four pads should be replaced. Also, any pads that are oily or greasy must be replaced, they cannot be properly washed because they are dirty. In case the pads can be serviced still, brush them off with fine wire, and pay attention to sides and back of the metallic backplate, and sweep the grooves in the friction material clean. Prior to installing the pads, make sure that the guide pin bolts run freely in the caliper body bushes and also a tight fit. Wipe down the caliper and piston, and ensure that you do not breathe dust in, and also to check the dust seal and piston, not to be damaged or leaked. In case of replacement of brake pads, it is necessary to push the caliper piston toward the rear of the cylinder with a G-clamp or other appropriate levers, while keeping an eye on the master cylinder reservoir to avoid overflow. Attach the inner pad into the caliper piston and install the outer pad into the mounting bracket so as to fit properly in the brake disc. Insert the caliper, reattach the guide bolts and tighten to the required torque. Install the wear sensor wiring by attaching it to the lower end cap and attaching the end caps back to the caliper guide bushes. Install a pad retaining spring, and place in the correct holes in the caliper body, properly connecting the wiring, and reconnecting the pad wear sensor wiring connector. Keep on pressing the brake pedal until the pads firmly contact with the brake disc to restore normal pedal pressure. Do the same with the other rear brake caliper, and then re-fit the roadwheels, engage the vehicle to the ground, and tighten the roadwheel mounting bolts to the required torque. Lastly, test the level of hydraulic fluid.