Jeep Wagoneer/Commando/Cherokee 1984-1998

Brake Master Cylinder

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FLUID RECOMMENDATIONS



The only brake fluid recommended for Jeep vehicles with standard or anti-lock brakes is a fluid meeting DOT 3 specifications.

FLUID LEVEL CHECK



See Figures 1, 2, 3 and 4



Click image to see an enlarged view

Fig. Fig. 1: Wipe the top of the brake fluid reservoir of any dirt or grime before removing the cap to add fluid

The master cylinder reservoir is located under the hood, on the left side of the firewall.

  1. Before removing the master cylinder reservoir cap, make sure the vehicle is resting on level ground and clean all dirt away from the top of the master cylinder.
  2.  



Click image to see an enlarged view

Fig. Fig. 2: Pry off the retaining clip from the master cylinder cover-1-piece, cast master cylinder/fluid reservoir shown



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Fig. Fig. 3: On the plastic see-through brake fluid reservoir, the MAX (top arrow) and MIN (bottom arrow) fluid level marks are visible on the side of the reservoir

  1. If equipped with a 1 piece, cast master cylinder/reservoir, pry off the retaining clip and remove the cover. The fluid level should be within 1 / 4 in. (6mm) of the top of the reservoir.
  2.  
  3. If equipped with a plastic, see-through brake fluid reservoir, the fluid level should be at the MAX (or FULL) mark on the side of either single or dual reservoir master cylinders. If below the MAX (or FULL) mark, unscrew and remove the brake fluid reservoir cap.
  4.  



Click image to see an enlarged view

Fig. Fig. 4: After removing the reservoir cover, add the necessary amount of brake fluid until it reaches the correct level

  1. If the level is low, add clean, fresh brake fluid to the proper level of the reservoir.
  2.  
  3. Replace the reservoir cover, or cap, after the system has been replenished.
  4.  


WARNING
Do not overfill the fluid reservoir. Overfilling could cause fluid overflow and , on some ABS-equipped vehicles, possible reservoir damage when the pump begins cycling.

If the level of the fluid is less than half the volume of the reservoir, it is advised that you check the brake system for leaks. Leak in a hydraulic brake system most commonly occur at the wheel cylinders. Leaks may also occur in brake lines running down the frame.

There is a rubber diaphragm in the top of the master cylinder cover/cap. As the fluid level lowers in the reservoir due to normal brake shoe wear or leakage, the diaphragm takes up the space. This acts to prevent the loss of brake fluid out of the vented cover/cap and to prevent contamination of the brake fluid by dirt. After filling the master cylinder to the proper level with brake fluid, but before replacing the cover/cap, fold the rubber diaphragm up into the cover/cap, then install.


WARNING
Do not allow brake fluid to come in contact with painted components on the vehicle. If left on any painted surface, it will dissolve the paint.

 
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