OEM Chevrolet Tracker Brake Master Cylinder

Chevrolet Tracker Brake Master Cylinder Parts and Q&A

• Master Cylinder
  91174779
  Q: How to replace the brake master cylinder on Chevrolet Tracker?

  A:

  First remove the fluid level connector of the reservoir and wash the reservoir and the master cylinder. First take out the reservoir then disconnect brake pipes (1,4) from abs proportioning valve and separate brake lines from the master cylinder if abs is present. Take out the master cylinder retaining nuts that attach it to the Brake Booster. When replacing brakes take off the Brake Booster master cylinder for vehicles without abs or remove the combo of master cylinder and proportioning valve for vehicles with abs. Disconnect the proportioning valve from the master cylinder only if it needs separation. Perform all necessary steps to fix and examine the master cylinder parts during replacement. Set the booster piston rod position afterwards empty the fluid from the master cylinder. Put the proportioning valve on the master cylinder when the vehicle has abs. After placing the master cylinder in position, use 2 nuts to fasten it onto the Brake Booster unit and tighten the nuts to 13 nm force (115 inch lbs.). Secure the brake pipes by disturbing nuts with 16 nm torque setting (12.0 ft. Lbs.). Insert the reservoir device while linking the fluid level connector and refilling the reservoir. Test for brake hydraulic leaks while performing the brake system drainage. The mechanic should check the brake pedal depth and drive the vehicle to validate brake performance.
• Master Cylinder
  91174778
  Q: How to Overhaul the Brake Master Cylinder (1.6L Non-ABS) on Chevrolet Tracker?

  A:

  To overhaul the master cylinder (1.6L Non-ABS), start by wearing safety glasses when lest your eyes get harmed and be careful of brake fluid irritants. Turn off the ignition switch and pop the hood. Discharge the pressure by releasing the brake fluid from the calipers, since the brake lines in both front and back brakes are pressurized. Remove the snap ring and the plate, and take out the Piston guide with the o-rings, and Piston stopper. Carefully remove the primary Piston assembly from the master cylinder so that there will be no damage to the cylinder wall and remove the primary Piston cup as well as the Piston stopper bolt and washer. Do not stick fingers in front of Piston when providing compressed air to prevent serious injury, and do not use lubricated compressed air on parts of the brake to prevent the damage of rubber parts. Blow compressed air into the stopper bolt hole to displace the secondary Piston assembly then remove Piston cup, secondary Piston pressure cup o-ring & spring. Screen all items for wear or destruction, replacing them if required and do not re-use Piston cups. Clean disassembled parts on brake fluid inspecting master cylinder bore for scoring or corrosion and replacing it in poor conditions. Wash the cylinder in clear brake fluid and shake out the remaining drop using a piece of cloth. When it comes to assembly, the o-ring should be fitted to the master cylinder, and respectively, the spring, secondary Piston assembly, new Piston cup, and new secondary Piston pressure cup are to be used. Then you install the main Piston and the new main Piston cup, then the new Piston stopper, Piston guide, and o-rings, and then the plate itself. Depress and install the snap ring, and install the Piston stopper bolt into the pistons with the latter fully inside the cylinder, tightening it to 10 nm (88.5 inch lbs). Reconnect the master cylinder to the booster, put a thin layer of brake fluid on the grommets (new one), and mount the reservoir to the master cylinder (finally, the reservoir).