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1998 Chevrolet Silverado Brake Box Installation

The Chevrolet C/K series is a family of full-size pickup trucks that General Motors has manufactured since 1960. The Silverado was the top trim level for the 1998 C/K trucks, and General Motors upgraded it to a separate model beginning with the 1999 model-year. The 1998 Silverado comes standard with an anti-lock braking system (ABS), which allows the vehicle to stop more effectively under emergency conditions. The Electro-Hydraulic Control Unit (EHCU) controls the amount of braking force to apply to each wheel.

Instructions

1

Locate the EHCU in the engine compartment on the left side of the engine. It is the black box with four brake lines running to it.

2

Detach the connectors for the electrical wiring from the EHCU. Disconnect the fittings for the brake lines with a socket wrench and detach the brake lines from the EHCU.

3

Disconnect the mounting bolts for the EHCU bracket with a socket wrench and remove the bracket from the vehicle. Remove the mounting bolts from the EHCU and detach the EHCU from its bracket.

4

Install the new EHCU onto its bracket and tighten the mounting bolts to 5 foot-pounds with a torque wrench. Connect the EHCU bracket to the vehicle and tighten the mounting bolts for the bracket to 33 foot-pounds.

5

Connect the brake lines to their original positions on the EHCU and tighten the fittings to 16 foot-pounds with a torque wrench. Attach the electrical connectors for the EHCU, ensuring the connections are secure.

6

Connect a TECH-1 scanning tool to the vehicles data link connector. Bleed the EHCU valve with three J-39177 tools and correct any ABS errors reported by the scanning tool. A professional mechanic would normally perform this step.