Brake Bleed - All Four

Bleed all four brake calipers to remove air from the hydraulic system and restore firm pedal feel, following proper sequence to ensure complete air evacuation.

Warnings

Tools required

Parts

• DOT 3 brake fluid × 1 — Use Mopar or equivalent DOT 3 specification

Fluids

• DOT 3 brake fluid — 1 qt

Preparation

1. Park vehicle on level surface and set parking brake firmly.
2. Place wheel chocks behind rear wheels.
3. Open hood and locate brake fluid reservoir on master cylinder (driver side firewall area).
4. Clean reservoir cap and surrounding area to prevent contamination.
5. Check current fluid level and condition. If fluid is dark brown or black, system may require complete flush rather than simple bleed.
6. Loosen all four wheel lug nuts while vehicle is on ground (do not remove).
7. Raise vehicle using floor jack at appropriate jacking points and support securely on four jack stands.
8. Remove all four wheels and set aside.
9. Have assistant available for brake pedal operation, or prepare for one-person bleeding method with check valve or vacuum bleeder.

Procedure

1. 1

   Prepare Master Cylinder Reservoir
   Remove master cylinder reservoir cap. Using turkey baster or fluid pump, extract old fluid from reservoir until approximately half full. Refill to MAX line with fresh brake fluid meeting factory specification (verify DOT 3 vs. DOT 4 in the service manual) from a sealed container. Keep bottle of fresh fluid and clean rag nearby for frequent refills during procedure. The reservoir must never drop below MIN line during entire bleeding process.
2. 2

   Apply Penetrating Oil to Bleeder Screws
   Locate bleeder screw on each caliper (verify hex size against service manual; typically located on top inboard side of the caliper). Apply penetrating oil to all four bleeder screw threads and allow to soak for 5-10 minutes. Wipe excess oil away from bleeder valve body to prevent fluid contamination. This is critical for preventing bleeder screw breakage on a 1992 vehicle.
3. 3

   Prepare Bleeding Equipment
   Cut approximately 18 inches of clear vinyl tubing. Attach one end snugly to bleeder screw on right rear caliper (passenger side rear - this is first in sequence). Place other end of tubing into clean catch bottle with 2 inches of fresh brake fluid in bottom to prevent air from being sucked back through tube. Ensure tubing fits tightly on bleeder nipple.
4. 4

   Bleed Right Rear Caliper
   Using 8mm 6-point wrench or socket, carefully loosen bleeder screw 1/2 to 3/4 turn (do not remove completely). Have assistant slowly press brake pedal to floor and hold. Observe brake fluid flowing through clear tubing into catch bottle. When pedal reaches floor, close bleeder screw snugly while assistant maintains pedal pressure. Then have assistant release pedal slowly. Repeat this cycle 5-8 times until no air bubbles appear in tubing and only clear fluid flows. Close bleeder screw firmly on final cycle. Check reservoir level and top off to MAX line before proceeding to next wheel.
   ⚠If bleeder screw feels seized or requires excessive force, stop and apply more penetrating oil. Rounded or broken bleeder screws require caliper replacement.
   Torque spec

   Bleeder Screw15 Nm (11 lb-ft)
5. 5

   Bleed Left Rear Caliper
   Move bleeding equipment to left rear caliper (driver side rear). Repeat identical bleeding procedure: loosen bleeder screw 1/2 to 3/4 turn, have assistant press pedal slowly to floor and hold, close bleeder while pedal is down, release pedal slowly. Continue for 5-8 cycles until fluid runs clear with no air bubbles. Torque bleeder screw to specification. Check and refill reservoir to MAX line.
   Torque spec

   Bleeder Screw15 Nm (11 lb-ft)
6. 6

   Bleed Right Front Caliper
   Move bleeding equipment to right front caliper (passenger side front). The front calipers are larger and may require additional cycles. Repeat bleeding procedure: loosen bleeder screw 1/2 to 3/4 turn, pedal down and hold, close bleeder, release pedal. Continue for 6-10 cycles until fluid is completely clear with zero air bubbles. Torque bleeder screw to specification. Check and refill reservoir to MAX line.
   Torque spec

   Bleeder Screw15 Nm (11 lb-ft)
7. 7

   Bleed Left Front Caliper
   Move bleeding equipment to left front caliper (driver side front - final wheel in sequence). Repeat bleeding procedure: loosen bleeder screw 1/2 to 3/4 turn, pedal down and hold, close bleeder, release pedal. Continue for 6-10 cycles until fluid runs absolutely clear with no air bubbles visible. Torque bleeder screw to specification on final close. Check reservoir and top off to MAX line.
   Torque spec

   Bleeder Screw15 Nm (11 lb-ft)
8. 8

   Perform Final Pedal Test
   With all bleeder screws closed and torqued, have assistant pump brake pedal rapidly 15-20 times, then hold firm pressure. Pedal should feel firm and high with minimal travel. If pedal feels spongy or sinks slowly, air remains in system - repeat bleeding sequence starting at right rear. If pedal is firm, proceed to reinstallation.
9. 9

   Reinstall Wheels
   Clean wheel mounting surfaces of any debris. Install wheels and hand-tighten all lug nuts in star pattern. Lower vehicle until wheels contact ground but jack stands still support most weight. Torque lug nuts to specification in star pattern sequence. Fully lower vehicle and remove jack stands. Perform final lug nut torque verification in star pattern.
   Torque spec

   Wheel Lug Nuts183 Nm (135 lb-ft)
10. 10

    Final Reservoir Service
    Check master cylinder reservoir one final time. Top off to MAX line with fresh DOT 3 fluid. Wipe any spilled fluid from reservoir exterior and master cylinder body. Reinstall reservoir cap securely. Inspect area around master cylinder and all four calipers for any signs of fluid leakage.

Reassembly

1. Ensure all four bleeder screws are torqued to 11 ft-lb and show no signs of leakage.
2. Master cylinder reservoir must be at MAX line with cap installed securely.
3. All wheels torqued to 103 ft-lb in star pattern.
4. Dispose of used brake fluid properly - do not pour down drain or onto ground.

Verification

• With engine off, pump brake pedal 10-15 times. Pedal should become firm and high with consistent resistance.
• Start engine (power brakes will increase assist). Pedal should remain firm with slightly less effort required.
• Perform low-speed test drive in safe area. Apply brakes progressively from 15-20 mph. Pedal should feel firm and linear with no sponginess.
• Perform moderate brake application from 30-40 mph. Vehicle should stop straight with no pulling and firm pedal throughout.
• After test drive, inspect all four calipers and bleeder screws for any fluid seepage.
• Check master cylinder reservoir level - should remain at MAX line. Any significant drop indicates a leak that must be found and repaired.
• If vehicle pulls to one side, pedal feels soft, or stopping distance seems increased, do NOT drive vehicle - system requires professional diagnosis.

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