Front Brake Squeal Sound During Light Brake Application

Some 2020-2022 Encore GX and 2021-2022 Trailblazer models may have a squealing sound originating from the front of the vehicle during light brake pedal application. (Fig. 5) The sound may occur at low speeds when the brakes are first applied or lightly applied, such as when exiting a parking lot or during first use after sitting overnight.

 

Fig. 5

 

For 2020-2021 Encore GX and 2021 Trailblazer models built before March 20, 2020, apply grease on the caliper pad spring abutments and anti-rattle clips as well as replace the front brake pads and front disc pad wear sensors. Only Encore GX models are equipped with brake wear sensors.

For 2021-2022 Encore GX and Trailblazer models built between March 20, 2020 and February 14, 2022, remove the original front disc brake pads, apply grease on the caliper pad spring abutments and anti-rattle clips, and reinstall the pads.

For vehicles built after February 14, 2022, refer to Service Information to diagnose any brake system sounds.

TIP: Some brake sounds are normal characteristics of all brake systems and do not indicate improper brake operation. Refer to Disc Brake System Description and Operation in the appropriate Service Information.

 

Greasing the Caliper Pad Spring Abutment and Clip

There are four pad abutments per caliper. (Fig. 6)

 

Fig. 6

 

The green areas shown below indicate the locations where grease should be applied. (Fig. 7)

 

Fig. 7

 

Be sure to clean the pad spring abutment area on the caliper and anti-rattle clip before applying Molykote M-77 Grease. Apply approximately 1.1 g of grease per caliper. (Fig. 8)

 

Fig. 8

 

For additional information, including part numbers, refer to Bulletin #20-NA-079 and Bulletin #22-NA-095.

 

– Thanks to Frank Jakubiec

Reducing Wi-Fi Interference in the Service Department
Common Customer Trailer-Side Faults When Using the Trailering App

4 Comments

  1. The article has been updated with the correct bulletin numbers.

  2. Sorry not being rude but there seems to be a little mix-up on the the bulletin numbers should they not be # 20-NA-079 (5563013) and #22-NA-095 (6074875) ?

  3. The article has been updated with the correct bulletin numbers.

  4. Robert Hoover says:

    The TSB#”s you refer to have nothing to do with brake squeal. TSB 22-NA-079: Poor Engine Performance in Extremely Cold Weather Conditions for LSY Engines
    TSB 20-NA-095: Speaker Grill Rusting on GM Accessory Multipro Tailgate Audio System By Kicker

Leave a Reply

Your email address will not be published.

*