2008 Saturn Astra Owner's Manual - Page 214

9-24 Vehicle Service and Care Some driving conditions or climates can cause a brake squeal when the brakes are first applied or lightly applied. This does not mean something is wrong with the brakes. Properly torqued wheel bolts are necessary to help prevent brake pulsation. When tires are rotated, inspect brake pads for wear and evenly tighten wheel bolts in the proper sequence to torque specifications in Capacities and Specifications on page 10-2. Brake linings should always be replaced as complete axle sets. Rear disc brake pads do not have built-in brake pad wear indicators. Periodic visual inspection of the rear brake pads is required to determine when to replace the pads. Visually inspect the rear brake pads whenever the rear wheels are removed such as during tire rotation. 1. Set the parking brake and make sure that the brakes have been given enough time to cool. 2. Remove the rear wheels. 3. Visually inspect the rear brake inner pads (C) at each rear wheel through the inspection window in the brake caliper (A). Brake pads should be replaced when the inner pad (C) is worn to 5/64 in (2 mm) of pad thickness (B). New brake pads, with no wear, are 25/64 of an inch (10 mm) thick. 4. After brake pad inspection or replacement, install the rear wheels. Brake Pedal Travel See your dealer/retailer if the brake pedal does not return to normal height, or if there is a rapid increase in pedal travel. This could be a sign that brake service might be required. Brake Adjustment Every time you make a brake stop, the disc brakes adjust for wear.