OEM Chrysler Voyager Brake Booster

Chrysler Voyager Brake Booster Parts and Q&A

• Brake Booster
  4721613AA
  Q: How to Service and Repair a Vacuum Brake Booster on a Left-Hand Drive on Chrysler Voyager?

  A:

  First, pump the brake pedal on a left-hand drive vehicle with the engine off until it feels solid; next, unhook the negative and positive cables from the battery, remove the battery's thermal guard shield, clamp and battery to service the vacuum brake booster. At this point, take off the screw that holds the engine coolant filler tube to the battery tray, remove the vacuum hose for speed control and take out the two nuts and one bolt that fasten the battery tray. If your servo is for speed control, put it nearby. Open the master cylinder fluid reservoir and remove the wiper module, then take out its connecting wiring. Using a solvent, rub it around the master cylinder junction with the power brake booster and next, separate the primary and secondary brake tubes from the ABS integrated control unit, fitting caps on the brake tube openings. After removing both nuts holding the master cylinder to the power brake booster, slide the master cylinder out straight and remember to place a new vacuum seal on it each time you remove it for service. You should detach the vacuum hose from the vacuum booster check valve, take the silencer panel out from beneath the instrument panel and loosen the booster input rod from the brake pedal. Use the retaining clip to detach it and then discard this part, remembering to attach a new clip to the booster rod when putting everything back together. Open the panel, remove the four nuts and pull the booster forward till it clears the engine compartment, making sure you do not open it up. While installing, fit the power brake booster under the dash panel, tighten all four mounting nuts to 29 Nm (250 in. lbs.) and before inserting the booster rod, lubricate its pin with a lubriplate. Change the brake lamp switch, put the silencer panel back and join the vacuum hose to the check valve. Carefully get rid of the old seal on the master cylinder, fit a new seal, place the master cylinder on the booster and fasten the two nuts to 25 Nm (225 in. lbs.). Bind the brake fluid level switch wire back to the wiring harness, connect both sets of brake tubes and tighten the nuts to a torque of 17 Nm (145 in. lbs.). The wiper module, speed control servo if present and battery tray should be fixed in their places and tightened with pliers to 14 Nm (124 in. lbs.). If you have a servo vacuum hose, attach it, as well as the air inlet resonator and hoses. After that, secure the engine coolant filler neck and place the battery and its pieces back in position. Always bleed the base brakes as needed and drive the vehicle to make sure the brakes are working properly.
• Brake Booster
  4721721AA
  Q: How to Remove and Install a Brake Booster in a Left-Hand Drive on Chrysler Voyager?

  A:

  Service your left-hand drive vehicle by pumping the brake with the engine off and making sure the pedal is firm, then disconnect both battery cables, remove the battery guard shield and clamp and then remove the battery itself before continuing. Remove the screw that keeps the engine coolant filler tube attached to the Battery Tray, unplug the vacuum hose from the vacuum tank (only if it has speed control) and remove the two nuts along with the one bolt that secure the battery tray, then take it out. For a servo that has speed control, take off the wiring harness from the speed control servo, remove both of its nuts and set the servo aside. Take out the wiper module and remove the wire harness from the brake level switch located in the master reservoir. After cleaning the connecting area with Mopar Brake Parts Cleaner, dissassemble the tubes on the unit and plug the open holes so the unit is not exposed. Take out the two nuts that are holding the master cylinder to the booster and pull it straight out, always remembering to seal the master cylinder with a new vacuum hose if removed. Unplug the vacuum hose from the valve on the booster, then in your vehicle, open the silencer panel and find the rod coming from the booster going to the pedal. Slide a screwdriver inserted in the retaining clip on the brake pedal pin to release it, take out the rod in the booster input and remove the four bolts underneath the booster. When those are gone, you can slide the booster up and out of the vehicle toward the engine. As you install the booster, fit it on the dashboard, secure the mounting nuts to the recommended torque, lubricate the brake pedal and set a new clip on the rod's end. Install a new brake lamp switch, apply the silencer panel and link the vacuum hose to the check valve. Cover the master cylinder once again, connect the push rod from the booster to the piston and tighten both mounting nuts to 25 Nm (225 in. lbs.). Attach the wiring harness to the brake fluid level switch, rejoin the brake tubes, fix them tightly at 17 Nm (145 in. lbs.), put in the wiper module; if you have speed control, attach the servo and tighten its mounting nuts to 14 Nm (124 in. lbs.). Replace the battery tray, fasten its nuts and bolts to 14 Nm (124 in. lbs.), attach the servo vacuum hose when necessary and secure the clamps of the air inlet resonator and hoses. After that, seal the engine coolant filler neck, fit the battery and its accessories and check and bleed the vehicle's brake system as appropriate, before driving it to see if the brakes operate correctly.