2009 Chevrolet Suburban 1500 Brake Master Cylinder

You should connect the BPMV supply hose quick-connect and ensure the supply hose quick-connect is fully engaged by attempting to pull the supply hose from the inlet fitting.

You should secure the mounting flange of the brake master cylinder in a bench vise so that the rear of the primary piston is accessible, remove the master cylinder reservoir cap and diaphragm, install suitable fittings to the master cylinder ports that match the type of flare seat required and also provide for hose attachment, install transparent hoses to the fittings installed to the master cylinder ports, then route the hoses into the master cylinder reservoir, fill the master cylinder reservoir to at least the half-way point with GM approved brake fluid from a clean, sealed brake fluid container, ensure that the ends of the transparent hoses running into the master cylinder reservoir are fully submerged in the brake fluid, using a smooth, round-ended tool, depress and release the primary piston as far as it will travel, a depth of about 25 mm (1 in), several times. Observe the flow of fluid coming from the ports, continue to depress and release the primary piston until fluid flows freely from the ports with no evidence of air bubbles, remove the transparent hoses from the master cylinder reservoir, install the master cylinder reservoir cap and diaphragm, remove the fittings with the transparent hoses from the master cylinder ports, wrap the master cylinder with a clean shop cloth to prevent brake fluid spills and remove the master cylinder from the vise.

You should use a suitable tool to remove the brake fluid from the brake master cylinder reservoir, discard the brake fluid into an approved container and disconnect the brake fluid pressure sensor electrical connector if equipped.

You should remove the brake fluid from the brake master cylinder reservoir, discard the brake fluid into an approved container, disconnect the brake fluid level indicator switch electrical connector, remove the master cylinder reservoir bolt, lift the master cylinder reservoir straight upward and remove the reservoir from the master cylinder and remove the master cylinder reservoir seals.

You should install 2 new master cylinder nuts and tighten them to 33 Nm (24 lb-ft), inspect the battery state of charge. If necessary, you should connect a battery charger to the 12V battery. The ignition switch must remain in the ON position with the engine OFF during this procedure.