2007 Cadillac Escalade ESV Brake Master Cylinder

The recommended torque is 33 N.m (24 Ib ft).

You need to 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 and install suitable fittings to the master cylinder ports that match the type of flare seat required and also provide for hose attachment and 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 halfway point with Delco Supreme 11(R), GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container. 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 and observe the flow of fluid coming from the ports. Then you can 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.

It has a total of 2 nuts.

You need to inspect the reservoir for cracks or deformation. If found, replace the reservoir. Next, you can clean the reservoir with denatured alcohol, or equivalent, dry the reservoir with non-lubricated, filtered air, lubricate the new seals and the outer surface area of the reservoir-to-housing barrels with Delco Supreme 11(R), GM P/N 12377967 (Canadian P/N 992667) or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container and install the lubricated seals, the reservoir to the master cylinder by pressing the reservoir straight down on the master cylinder until the pin holes are aligned and carefully install the reservoir retaining pins to secure the reservoir. Then you can place the brake fluid level sensor into the reservoir, press it into place to secure the sensor retaining tabs, remove the master cylinder from the vice, install the master cylinder, release the park brake and bleed the hydraulic brake system.

You need to visually inspect the brake fluid level through the brake master cylinder reservoir. If the brake fluid level is at or below the half-full point during routine fluid checks, the brake system should be inspected for wear and possible brake fluid leaks. If the brake fluid level is at or below the half-full point during routine fluid checks, and an inspection of the brake system did not reveal wear or brake fluid leaks, the brake fluid may be topped off up to the maximum-fill level. If brake system service was just completed, the brake fluid may be topped off up to the maximum-fill level. If the brake fluid level is above the half-full point, adding brake fluid is not recommended under normal conditions. If the brake fluid is to be added to the master cylinder reservoir, clean the outside of the reservoir on and around the reservoir cap before removing the cap and diaphragm.