Chevrolet Trax: Master cylinder bench bleeding

Fig. 26: Depressing And Releasing Primary Piston

WARNING: Refer to Brake Fluid Irritant Warning .

CAUTION: Refer to Brake Fluid Effects on Paint and Electrical Components Caution .

1. Secure the mounting flange of the brake master cylinder in a bench vice so that the rear of the primary piston is accessible.
2. Remove the master cylinder reservoir cap and diaphragm.
3. Install suitable fittings to the master cylinder ports that match the type of flare seat required and also provide for hose attachment.
4. Install transparent hoses to the fittings installed to the master cylinder ports, then route the hoses into the master cylinder reservoir.
5. Fill the master cylinder reservoir to the maximum fill level with brake fluid from a clean, sealed brake fluid container. Refer to Master Cylinder Reservoir Filling.
6. Ensure that the ends of the transparent hoses running into the master cylinder reservoir are fully submerged in the brake fluid.
7. Using a smooth, round-ended tool, depress and release the primary piston as far as it will travel, a depth of about 25 mm (1 in), several times. Observe the flow of fluid coming from the ports.

   As air is bled from the primary and secondary pistons, the effort required to depress the primary piston will increase and the amount of travel will decrease.

8. Continue to depress and release the primary piston until fluid flows freely from the ports with no evidence of air bubbles.
9. Remove the transparent hoses from the master cylinder reservoir.
10. Install the master cylinder reservoir cap and diaphragm.
11. Remove the fittings with the transparent hoses from the master cylinder ports. Wrap the master cylinder with a clean shop cloth to prevent brake fluid spills.
12. Remove the master cylinder from the vice.

BRAKE FLUID LEVEL INDICATOR SWITCH REPLACEMENT

Removal Procedure

1. Disconnect the brake fluid level indicator switch electrical connector.

Fig. 27: Brake Fluid Level Indicator Switch

2. Using a small, flat-bladed tool, lift the locking tab on the underside of the brake fluid level indicator switch (1) and remove the switch.
3. Inspect the master cylinder reservoir for damage and replace, if necessary. Refer to Master Cylinder Reservoir Replacement.

Installation Procedure

1. Install the master cylinder reservoir, if removed. Refer to Master Cylinder Reservoir Replacement.

Fig. 28: Brake Fluid Level Indicator Switch

2. Install the brake fluid level indicator switch (1) by pressing the switch firmly into the brake master cylinder reservoir.
3. Connect the brake fluid level indicator switch electrical connector.

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