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How to Install a Brake Controller on a 1999 Suburban

A Suburban is a sport utility vehicle that General Motors manufactures under its Chevrolet brand. The anti-lock braking system (ABS) is a standard feature on late-model Suburbans that allows the vehicle to stop more effectively in an emergency. A brake controller, or electronic brake control module (EBCM), reduces the braking force to a wheel when it rotates significantly more slowly than the other wheels. The installation procedure for the EBCM is generally the same for all Suburbans made from 1999 to 2005.

Instructions

1

Disconnect the cable from the negative battery terminal with a socket wrench to prevent an electrical discharge during the EBCM installation procedure. Raise the vehicle with a floor jack, and support it on jack stands.

2

Locate the Electronic Hydraulic Control Unit, or EHCU, under the vehicle on the drivers side. It is bolted on the frame next to the drive shaft. The EHCU is an assembly of the EBCM, the brake pressure modulator valve (BPMV) and a mounting bracket. The mounting bracket attaches to the frame of the vehicle, the BPMV attaches to the mounting bracket and the EBCM attaches to the top of the BPMV. The EHCU is generally a black cube about 3 inches on a side with connections for the brake lines and the ABS pump motor when it is fully assembled. Wash the area around the EHCU with a shop rag to avoid contamination of the EBCM.

3

Detach the electrical connector from the EBCM. The EBCM is a thin, black, rectangular box mounted atop the BPMV. Remove the fittings for the brake lines with a socket wrench and disconnect the brake lines from the BPMV. The BPMV is the component under the EBCM that has connections for the brake lines and attaches to the EHCU mounting bracket. Remove the mounting bolts for the EHCU bracket with a socket wrench and disconnect the bracket from the vehicle.

4

Disconnect the mounting bolts for the BPMV with a socket wrench and detach the BPMV from the EHCU. Disconnect the electrical connector for the ABS motor from the EBCM. Remove the mounting bolts for the EBCM, and detach the EBCM from the BPMV.

5

Clean the mounting surface on the BPMV with a clean shop cloth. Mount the new EBCM onto the BPMV, and fasten the EBCM with the retaining bolts that came with the EBCM. Tighten the retaining bolts to 39 inch-pounds with a torque wrench. Attach the electrical connector for the ABS motor to the EBCM.

6

Install the BPMV to its bracket and tighten the mounting bolts to 80 inch-pounds with a torque wrench. Connect the EHCU to the vehicle and tighten the EHCU bracket bolts to 18 foot-pounds. Attach the electrical wiring harness to the EBCM.

7

Attach the brake lines to the BPMV and tighten the fittings to 18 foot-pounds with a torque wrench. Lower the vehicle, and connect the cable to the negative battery terminal with a socket wrench. Bleed the brake system.

Posted by Unknown at 3:00 PM

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