The GMT900 debuted in 2007 and also came standard with ABS and stability control. Keep analysis for ideal practices because that performing brake jobs on GM’s GMT900.


PadsBoth front- and also rear-disc brake pads have integral, audible undertake sensors put on the inboard pad. Replace the bowl brake pads when the friction surface ar is worn to in ~ 0.76 mm (0.030 in) that the mounting plates.

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Do not use any air devices to eliminate the guide pin bolts. Use hand devices only. Use an open-end wrench to organize the caliper overview pin in line with the brake caliper if removing or installing the caliper overview pin bolt. Carry out not enable the open-end wrench come come in call with the brake caliper, together this will reason a pulsation once the brakes are applied due to misalignment. Torque the front caliper overview pin bolts to 74 ft./lbs. The rears require only 28 ft./lbs.

The caliper brackets need to be cleaned and also inspected every time the pads are replaced, and brand-new pad abutment clips should additionally be used every time.

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The bolts that secure the bracket use red thread-locker link on the threads. Make certain to clean the old link from the threads before applying any brand-new compound. The prior bolts have actually a torque spec of 148 ft./lbs. For the front and 122 ft./lbs. For the rear.
The basic hydraulic brake device must be bled before performing this automated bleeding procedure. The engine needs to be off to inspect pedal feel. Apply the brakes three to 5 times, or until the brake pedal i do not care firm, in stimulate to deplete the booster strength reserve.

The automatically bleed procedure have the right to remove air the is trapped in the hydralic manage module (HCU). If a caliper or brake line has actually been replaced, you could have to lug out the automated bleed procedure through a scan tool numerous times to reclaim pedal feel.

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Before returning the car to the customer, drive the auto over 8 mph to allow ABS initialization come occur. This self-check exercises the pump and valves in the HCU. In some situations where the technician does not test-drive the vehicle, the HCU will certainly initialize together the customer pulls away, only to release air right into the brake system. This can cause a long pedal during the an initial stop.

With JL4 (StabiliTrak) Option

The basic hydraulic brake system must it is in bled prior to performing this automatically bleeding procedure.

Install a scan tool to the vehicle.Start the engine and idle.Using the scan tool, begin the automatically bleed procedure.Follow the instructions on the scan tool to complete the automatic bleed procedure. Use the brake pedal when instructed.Turn the ignition off.Remove the scan tool.Fill the brake grasp cylinder to the maximum-fill level.Bleed the hydraulic system.With the ignition off, apply the brakes three to 5 times, or till the pedal becomes firm, in bespeak to diminish the booster strength reserve.Slowly depress and release the pedal. Watch the feeling of the pedal.If the brake pedal feel spongy, repeat the automatic bleeding procedure. If the pedal tho feels spongy ~ repeating the automatic bleeding procedure, examine the brake device for outside leaks.Turn the ignition key on with the engine off. Examine to check out if the brake warning lamp remains illuminated.If the brake device warning lamp stays illuminated, perform not allow the vehicle to be thrust until that is diagnosed and also repaired.Drive the vehicle to exceed 8 mph to enable ABS initialization to occur. Watch brake pedal feel.If the pedal feels spongy, repeat the automated bleeding procedure till a firm brake pedal is obtained.

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Without the JL4 Option

This procedure might be performed on all vehicles other than those fitted with choice code JL4, StabiliTrak or VSES. The base hydraulic brake system must it is in bled prior to performing this automatically bleeding procedure.

Install a scan tool to the vehicle.Start the engine and also idle.Depress the pedal firmly and also use steady push on the pedal.Using the scan tool, start the automated bleed procedure.Follow the accuse to finish the procedure. Release the pedal between each check sequence.Turn the ignition off.Remove the scan tool.Fill the brake grasp cylinder reservoir to the maximum-fill level.Bleed the hydraulic brake system.With the ignition off, use the brakes three to five times, or till the brake pedal i do not care firm, in bespeak to deplete the booster strength reserve.Slowly depress and release the pedal. Watch the feeling of the pedal.If the brake pedal feels spongy, repeat the automatic bleeding procedure. If the brake pedal tho feels spongy after repeating the automatic bleeding procedure, inspect the brake device for exterior leaks.Turn the ignition an essential on with the engine off; inspect if the brake device warning lamp stays lit.If the brake device warning lamp continues to be illuminated, perform NOT permit the vehicle to be moved until the is diagnosed and repaired. Describe Symptoms – Hydraulic Brakes.Drive the automobile to exceed 8 mph to enable ABS initialization to occur. Observe pedal feel.