CJ Brake Parts

CJ brake systems vary

The CJ series was built over several decades, and its brake hardware changed with the years, axles and models. Some use drum brakes at all four corners, while later models have front discs. Axle makers such as Dana and AMC also differ, which affects hub, rotor and caliper dimensions. For that reason, matching the part to your specific CJ model and axle matters more than matching the name.

Parts covered

• Rotors for disc brake conversions or original discs
• Caliper sleeves, bushings and slide hardware
• Bleeder screws and caps, needed to remove air from the system
• Other small hardware and seals that wear with age

Small items such as rubber caliper sleeves and bleeder caps are inexpensive but important. A seized or torn sleeve can cause a caliper to hang, wear pads unevenly or overheat.

Choosing parts for an older Jeep

Check the model year and the axle tag or identification, if present. Compare the rotor diameter, thickness and bolt pattern with what is on the vehicle. Look at whether the Jeep uses a single or dual master cylinder, since this can influence what brake parts it needs. Many CJs have been converted or modified over the years, so inspect what is actually on yours before ordering parts based on the original build sheet.

Service and safety

Brakes are critical to safety. Replace rotors and pads in axle sets for even braking, and inspect brake hoses, lines, wheel cylinders or calipers and fluid at the same time. Old brake fluid absorbs moisture and corrodes parts, so flush it on a regular schedule. Bleed the system after opening any hydraulic part, and test the pedal firmness and stopping at low speed before regular use. If you are not experienced with brakes, have a qualified mechanic do the work.

Fitment

Confirm fitment for your exact year, model, axle and brake type, and check the manufacturer's specifications. Where a part is no longer a direct match, compare dimensions such as rotor diameter and thickness, bolt circle, and hub bore on the old part before accepting a substitute, and keep the removed parts until the replacement is verified. Photograph the setup before disassembly, because drum and disc layouts hold many small springs and clips.

Inspection and common mistakes

Old Jeeps often have problems beyond a single worn part. Check wheel cylinders or calipers for leaks, hoses for cracks and hard lines for rust. Inspect the parking brake cables and linkages, which seize with age. Check the master cylinder for fluid contamination, and replace the fluid if it looks dark. Do not mix parts from different brake systems, and do not reuse hardware that is rusted or distorted. After installation, bed in the new pads and rotors by following the manufacturer's instructions, and check the fluid level after a week of use. If the pedal sinks or feels soft, stop and find the cause before driving further.

Photos and notes taken during disassembly help a great deal on older vehicles, because the order of springs, clips and washers is easy to forget, and different production years do not always arrange them the same way.