OEM Chrysler Pacifica Brake Booster

Chrysler Pacifica Brake Booster Parts and Q&A

• Brake Booster
  4683844AC
  Q: How to Maintain and Fix a Brake Booster on Chrysler Pacifica?

  A:

  Before you start, push the driver's seat to the notch furthest from the steering wheel and take off the negative Battery Cable from the battery post. You should take out the car battery. Before taking the master cylinder out, pump the pedal down till you experience a strong push, with the engine switched off. After taking off the bottle's nuts, put it back in place and clean every part of the brake fluid reservoir and master cylinder well with Mopar(R) Brake Parts Cleaner or something similar. Pull the wiring harness off the brake fluid level switch in the master cylinder reservoir and then release the secondary and primary brake tubes at the ABS ICU, quickly capping them and putting in sealing plugs where the pipes were. With the two nuts removed from the master cylinder connection, take it out by sliding it straight away and make sure you reattach its vacuum seal as you replace it. Remove the bolts from the ABS ICU bracket and lift the ICU off the frame rail. Then lower it onto the transaxle. Pull the vacuum hose off the check valve on the booster, access and take out the knee blocker air bag and pull out the booster push rod from the brake pedal pin by using a small screwdriver to manage the clip which should be thrown out and a new one used during reassembly. Remove the brake switch there and after that loosen the four bolts that secure the power brake booster to the engine compartment. Before guiding the booster into its place, align a new seal over the push rod and secured studs. Place the four mounting nuts, then tighten each to 28 Nm (21 ft. lbs.) torque. On the brake pedal pin, place the booster push rod and then fit a retaining clip to hold it securely. Add and set the new brake lamp switch before installing the knee blocker air bag and its related parts once more. Attach the ABS ICU onto the car, using the mounting bracket and tighten the bolts to 18 ft. lbs. Make sure the new vacuum seal fits securely on the rear of the master cylinder and then put the master cylinder onto the power brake booster studs, bring the booster push rod and master cylinder piston together. Place the two master cylinder nut handles in each side of the engine bay and tighten them to 25 Nm (225 inch lbs.) of torque. The primary and secondary brake tubes should be inserted into the ICU ports, properly held during tightening to better control the flex section and then the tube nuts should be tightened to 14 Nm (120 inch lbs.) torque. Fit the brake fluid level switch wiring back into place, set the coolant recovery bottle in its bracket and link the battery cables once the battery is back inside. Once you've added some clean Mopar(R) Brake Fluid or equivalent to the master cylinder, release all the air from the lines by bleeding the brakes and make sure they function properly while driving around.
• Brake Booster
  4877320AA
  Q: How to Install a Brake Booster and Master Cylinder on Chrysler Pacifica?

  A:

  Always insert a new dash seal onto the booster's mounting studs before installing the power brake booster. Place the power brake booster under your hood hinges, then route the push rod and mounting studs through the dashboard while aligning the vacuum check valve on the booster with the 10 O'clock spot. Fix the booster by screwing four nuts into the mount and tightening them to 34 Nm (25 ft. lbs.). Push the booster push rod over the brake pedal pin and fasten it with a new retaining clip. Install and adjust the stop lamp switch into the right area on the pedals. Please ensure you replace the vacuum seal during your master cylinder installation. Put in the master cylinder and the coolant bottle and after that, attach the negative cable to the battery. Bleed the brakes after you've filled the master cylinder with clear, new Mopar(R) Brake Fluid or a similar product. When finished, check the effectiveness of stopping the vehicle by applying the brakes in normal road conditions.