New ABS still getting push back from my brakes

DAVOKIE98CHEVY

MEMBER
1998 CHEVROLET S-10
4WD
AUTOMATIC
190,000 MILES

Brakes were pushing back and notice my ABS light was starting to come on. Took my car to my mechanic. He at first he thought the ABS light was sensor glitch. (Car is getting old with a lot of miles. 290,000. But I take care of it.) And I guess I didn't described the issue too well. He thought it was the brake pump. Replaced it. Same issue after, so brought it in again. Replaced my ABS. It seemed to fix it. But then maybe a month after, my brakes did the same thing again when almost nearing a complete 'stop' at the stop sign on my sister's neighborhood street. Maybe a week later did it again when coming to a stop in the Walmart parking lot and my ABS light came on. But it disappeared when I stop at the next store. Then a couple of weeks later at my sister's again.

9 Replies

KENW1

MECHANIC
213 POSTS

Thanks for stopping by 2CarPros.

This model had a lot of issues with the ABS systems when new and age isn't kind to the solder connections. Did they replace the actual electrical assembly or just the pump?

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Wednesday, March 13th, 2019 AT 4:28 PM

DAVOKIE98CHEVY

MEMBER
6 POSTS

If referring to the brake pump, I believe just the pump. That is all they showed me when I went to get it. If your referring to the ABS, I am not sure.

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Wednesday, March 13th, 2019 AT 4:40 PM

KENW1

MECHANIC
213 POSTS

There's a module attached to the pump that controls the solenoids. It is very common for the solder joints in it to fail. It'll cause the light to come on and show no codes and intermittent abs operation when it's not called for. IF you look on eBay some companies offer a rebuild service where they replace the relays and reflow the solder joints. This usually resolves these issues. I'll post how to remove it below.

REMOVAL PROCEDURE

IMPORTANT: After installation, calibrate the new Electronic Brake Control Module (EBCM) to the tire size that is appropriate to the vehicle. Refer to Tire Size Calibration and to Trim Level Calibration portions of ABS System Operation.

1. CAUTION: Before removing or installing any electrical unit or when a tool or equipment could easily come in contact with "live" exposed electrical terminals, disconnect the negative battery cable to help prevent personal injury and/or damage to the vehicle or components. Unless instructed otherwise, the ignition switch must be in the "OFF" or "LOCK" position.

2. Remove the four T-25 Torx screws (1) that fasten the EBCM to the Brake Pressure Modulator Valve (BPMV).
3. Partially remove the EBCM (2) from the BPMV (4) enough to access the electrical connectors. Removal may require a light amount of force.

IMPORTANT: Do not use a tool to pry the EBCM or the BPMV. Excessive force will damage the EBCM.

4. Disconnect the four electrical connectors from EBCM.
5. Fully remove the EBCM (2) from the BPMV (4).

INSTALLATION PROCEDURE

IMPORTANT:
Do not reuse the old mounting screws. Always install new mounting screws with the new EBCM.
Do not use RTV or any other type of sealant on the EBCM gasket or mating surfaces.

1. Install the EBCM gasket (3) onto the BPMV (4).
2. Install EBCM (2) on to the BPMV (4).
3. Connect the four electrical connectors to the EBCM.
4. Ensure that the new EBCM gasket (3) is aligned correctly.

5. Install the four new T-25 Torx screws (1) in the EBCM (2).
Tighten the four T-25 Torx screws to 5 Nm (39 inch lbs.) In an X-pattern.

6. Connect the negative battery cable.
7. Revise the tire calibration using the Scan Tool
8. Return to Diagnostic System Check.

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