OEM Chrysler 300 Brake Booster

Chrysler 300 Brake Booster Parts and Q&A

• Brake Booster
  68033785AA
  Q: How to Install and Maintain a Brake Booster on Chrysler 300?

  A:

  Replacement seals should be placed over the push rod and mounting studs at the rear of the new power brake booster, prior to installation. Pass the boosters through the space between the cross-brace and windshield, guiding both rods and the mount to fit through the front of the dash panel. Apply 25 Nm (18 ft. lbs.) of torque to all booster mounts to avoid leaks in the vacuum lines. Slide the push rod from the booster onto the brake pedal pin, then insert a new clip to lock it into place. Add and set up the brake lamp switch to the vehicle. Screw the vacuum hose to the check valve on the booster while still keeping the check valve in place. Should the car have MK25 and Electronic Stability Program, connect the wiring from the BMS to the pedal travel sensor of the power brake booster and to the active brake booster solenoid. Fix the master cylinder in place. Install the windshield wiper module and the related items you removed when accessing the system. Connect the negative cable of the battery to its post on the battery, making sure everything is right. Once you've filled and bled the brakes, drive the car around to check how well the brakes function.
• Brake Booster
  5139145AA
  Q: How to Maintain and Fix a Brake Booster on Chrysler 300?

  A:

  If you want to service or repair the vacuum brake booster, move the driver's seat all the way to the back and remove the negative cable from the battery post. Without the master cylinder and if the vehicle includes an ESP, release theottage the brake control unit wiring for the power booster and the solenoid in the brake booster. Pull the vacuum hose away from the check valve located on the booster's surface, but make sure you aren't taking out the check valve, then remove the brake lamp switch. To remove the push rod from the brake pedal pin, slide a small screwdriver in between the retaining clip and pin, rotate it to let the clip move over the end of the pin and take it off and discard it. A new clip must be used when you reinstall everything. After moving the push rod off the brake pedal, pull out the power booster's four mounting bolts, then remove the windshield wiper module. Slide the power brake booster toward you out of the dash and lift it up through the space between the cross-brace and the windshield. After removing the push rod and mounting studs from the booster's rear, attach the new seal with the push rod and mounting studs. Place the power brake booster through the opening, direct the push rod and all mounting studs through the dash panel and torque all four nuts to 25 Nm (18 ft. lbs.) to prevent vacuum leaking. Put the booster push rod onto the brake pedal pin and fasten it using a new retaining clip. Put in the new brake lamp switch, connect the vacuum hose back to the check valve and also reinsert the wiring harness at both the pedal travel sensor and active brake booster solenoid if the car has ESP. Replace the master cylinder and the wiper module and install any extra components removed prior to access. After that, join the battery negative cable to the battery connector and do a quick drive to check how the brakes are working.