2007 Chevrolet AVEO5 Brake Service (ONLINE REPAIR MANUALS)

AC-Delco Tandem Diaphragm Type

This unit utilizes a vacuum power chamber, consisting of a front and rear shell, housing divider, front and rear diaphragm, plate assemblies, hydraulic pushrod and a diaphragm return spring, Fig. .

In normal operating mode, with service brakes in released position, the booster operates with vacuum on both sides of its diaphragms. When brakes are applied, air at atmospheric pressure is admitted to one side of each diaphragm to provide power assist. When the service brake is released, atmospheric air is shut off f...

• Keep grease and other foreign material off brake linings, caliper, surfaces of disc and external surfaces of hub.
• Avoid deforming disc, and nicking or scratching brake linings.
• Worn or damaged rubber piston seals should be replaced.
• During removal and installation of a wheel assembly, ensure not to interfere with or damage caliper splash shield, or bleeder screw.
• Front wheel bearing pre...

Master Cylinder Overhaul

Grand Prix & Impala

Disassemble

Refer to Figs. and , when performing the following procedures.

• Disconnect and plug hydraulic lines.
• Remove mounting nuts and master cylinder.
• Remove reservoir cover and diaphragm. Discard old brake fluid.
• Inspect cover and diaphragm.
• Remove fluid level switch.
• On models equipped with compact master cylinder,remove proportioning valve, Fig. .
• On all models, depress primary piston and remove lock ring.
• Plug primary fluid outlet (outlet nearest to cowl when master cylinder is installed), then remove primary and secondary pistons by a...

The most common cause of brake chatter on disc brakes is a variation in disc thickness. If roughness or vibration is encountered during highway operation or if pedal pulsation is experienced at low speeds, the disc may have excessive thickness variation. To inspect for this condition, measure the disc at 12 points with a micrometer at a radius approximately one inch from edge of disc. If thickness me...

When working on or around brake assemblies, care must be taken to prevent breathing asbestos dust, as many manufacturers incorporate asbestos fibers in the production of brake linings. During routine service operations the amount of asbestos dust from brake lining wear is at a low level because of a chemical breakdown during use and a few precautions will minimize exposure.

• Do not sand or grind brake linings unless suitable local exhaust ventilation equipment is used to prevent excessive asbestos exposure.
• Wear suitable respirator approved for asbestos dust use during repair procedure...