Question 1

How to replace the brake master cylinder (JD9) or the two-mode hybrid master cylinder on Cadillac Escalade?

Accepted Answer

Before replacing the Brake Master Cylinder (JD9) or two-mode hybrid master cylinder you must turn the ignition off and leave it there without depressing the brake pedal. Then take out the brake fluid from the reservoir and place it in authorized storage. Unplug the brake fluid sensor electrical connection and separate both ends of the Brake Master Cylinder hose assembly. Position them on the side. To avoid fluid leaks tap the brake pipe primary fitting before sealing it with covers while also sealing the master cylinder outlet port. Repeat this process by disconnecting the left supply brake pipe fitting , right supply brake pipe fitting , right front brake pipe fitting , and left front brake pipe fitting , each with corresponding covers and seals. Seize off the Brake Master Cylinder nuts and remove them before pulling out the Brake Master Cylinder along with its master cylinder seal. To install the cylinder slide the Brake Master Cylinder seal onto its adapter first before placing the assembly with a properly seated seal onto the adapter. Use new master cylinder nuts and secure them to 33 nm (24 lb ft) torque setting. Fix the assembled brake connections between left front, right front, right supply, left supply, and primary brake lines with a torque of 30 nm. Join the Brake Master Cylinder reservoir return hose quick connect back to the supply hose quick connect then attach the Brake Fluid Level Sensor electrical connector. Put fluid in the Brake Master Cylinder reservoir then remove air from the hydraulic brake system.

Question 2

How to service and repair the Brake Master Cylinder on Cadillac CTS?

Accepted Answer

The first step when fixing the Brake Master Cylinder safety depends on your knowledge of brake fluid warnings and its impact on car paint and electrical equipment. Delco supreme ii brake fluid part number 12377967 (Canadian part number 992667) provides the best protection to internal rubber seals because it must be taken from a clean sealed container. Set the Brake Master Cylinder mounting flange in the vise to safely reach the rear of the main Piston for service work. Install proper attachments on the master cylinder ports and connect them to hose pipes before removing its reservoir components. Connect transparent hoses to these fittings then position the hoses into the reservoir space. Pour the suggested brake fluid into the reservoir until the liquid reaches half-way and the hose ends remain covered by fluid. Press and release the primary Piston 25 mm (1 inch) with a round-ended tool several times while checking fluid flow from the ports; the strength needed to push the Piston increases as air exits the brake system. Perform this action until the ports discharge liquid without trapped air. Unplug the transparent hoses from the reservoir and put them back in place before disconnecting the master cylinder fittings from their ports. Once done keep the master cylinder covered by a cloth during removal.

Question 3

How to replace the brake master cylinder on Cadillac XLR?

Accepted Answer

Before starting the Brake Master Cylinder replacement process disconnect the electrical connector from the brake fluid sensor and then disconnect the brake lines from the master cylinder. Insert rubber caps on the pipe ends to prevent brake fluid loss. First you close the brake pipe ports then remove the master cylinder mounting nuts to take out the part from the vehicle. Empty every brake fluid from the master cylinder storage tank. Before adding the master cylinder to the Brake Booster you should drain brake fluid from the system while bleeding the cylinder on a workbench. Fasten the master cylinder nuts with 29 n.m torque measurements (21 lb ft). Place the brake pipe plugs away while connecting the brake pipes to the master cylinder. Fully tighten the brake pipe screws at the master cylinder to reach 24 n.m (18 lb ft). Connect the electrical unit to the brake fluid sensor and complete hydraulic brake system bleeding.

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