What are the steps and considerations for inspecting and maintaining brake system,Brake Booster and Parking Brake Shoe on 2007 through 2015 Toyota Avalon?

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When you sense your car pulling to one side, when there is squealing or dragging noise from the brakes, excessive pedal travel, pedal pulsations or fluid leakages, ensure that the regular brake system inspections are carried out. The disc brake pads have built-in wear indicators which give out high-pitched noises like a squeal or scrape when they approach their replacement point and demand an immediate change of pads to avoid expensive damage to the discs. Start by loosening the wheel nuts, then lift up the vehicle and place it on jackstands. Remove the tires. For disc brakes, check pad thickness through inspection holes on each calliper while ensuring that lining material is above a specified thickness. If accurate measurement seems impossible or in case there are doubts about it, remove the caliper and pads for closer scrutiny. Wipe off pads with brake cleaner and remeasure using a steel pocket ruler or vernier caliper. Reveal disc thickness using micrometer; determine scoring, gouging, or burnt areas. In case of any problems with them think about disc resurfacing or doing away with them altogether by replacing with new ones. Before mounting your wheels inspect brake lines and hoses for cracks, worn out spots, rusting signs, leakage points as well as bends to make sure that they don't have any sharp edges on them; as well they should not interfere with moving parts in addition to exhaust components. Damaged lines as well as fittings are repaired or replaced if necessary. For rear parking brake shoes in disc brakes inspect lining thickness by removing rubber plug from front of disc or by removing rear brake caliper and disc for more comprehensive evaluation into this area of interest. Parking brake shoes should be replaced once lining material gets close to recessed rivets or metal shoes within 1/16 inch from them. Check springs and adjusting mechanisms as well as drum side of brake discs for even operation and distortions if there are any. When you are done, just tighten the wheel nuts, snug them down, lower the vehicle and then finally tighten the nuts to the prescribed torque specifications. Observe pedal movement when starting engine with brake full depressed to perform a brake booster check. While driving with the engine on, there should be no change in brake pedal travel or distance covered by it. Switch off for 30 seconds and re-start the engine to confirm reduced pedal travel with each subsequent application. One more thing left-check whether your parking brake is effective or not by counting clicks up of handle or down of pedal while pressing it until fully engaged. The number of clicks should match the specified count thus one needs to adjust parking brake accordingly. Alternatively, verify parking brake effectiveness by parking on a steep hill in Neutral; if the vehicle rolls, perform parking brake adjustments.

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