OEM Chrysler 300M Brake Booster

Chrysler 300M Brake Booster Parts and Q&A

• Brake Booster
  4779072AE
  Q: How to Maintain and Fix a Brake Booster on Chrysler 300M?

  A:

  First, take off the Battery Cable linked to the ground stud on the right strut tower and separate it from power and other wires with a cable isolator. After that, take the caps off the Wiper Arms to get to the nuts, carefully rock the wiper arms back and forth and pull them off. After removing the wiper module and cover and the cowl, detach the 8 bolts from the reinforcement to the strut towers and the 1 bolt holding the wiper module to the reinforcement before you take it out. Disconnect the wire at the brake fluid level sensor on the master cylinder reservoir's right side and take out the 2 nuts that hold the master cylinder to the vacuum booster. Gently take off the master cylinder from the vacuum booster, keeping the Brake Lines attached and rest it on the left engine cylinder head cover. Take off the vacuum hose from the power brake booster check valve but leave the check valve attached. To remove the old retainer clip, tilt the bonnet forward, use a screwdriver from under the instrument panel and unclip it from the pedal pin on the brake pedal. Get rid of the four nuts that hold the power brake booster to the vehicle's dash panel which are fitted underneath the steering column and the pedal bracket in the dash. Set the windshield wiper motor crank lever to 12 and after that, slide the power brake booster out of the dash panel. You should not disassemble the power brake vacuum booster, as all servicing should be done on the unit as one unit. Set the power brake vacuum booster onto the dash panel and tighten the four mounting nuts to 28 Nm (250 inch lbs.) torque during installation. Apply lubriplate or an alternate lubricant to the part of the brake pedal pin facing the bearing, join the brake pedal pin to the booster input rod and put in a new retainer clip. Start by moving the under-hood wiring harness to the space above the mounting studs in front of the booster, before you install the master cylinder. Adjust the master cylinder on the booster, so the routing bracket is placed on the matching stud, attach the 2 mounting nuts and turn them to 28 Nm (250 inch lbs.) torque. Attach the brake fluid level sensor connector and put all vacuum hoses on the metal booster vacuum check valve. Access the brake lamp switch to check its operation and after that, bolt the wiper module reinforcement in place using 9 bolts. Replace the covers over the wiper module and cowl and tighten the screws tightly. Next, connect the battery ground cable to the shock tower ground stud, operate the windshield wiper switch to allow them to settle into position and finally mount the wiper arms onto the pivots while tightening their nuts and covering with the caps. Make certain the power brake booster and brakes are operating properly.