Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSMERCURY1998MOUNTAINEER 5.0 P, AWDREPAIR AND DIAGNOSIS (SINGLE PAGE)BRAKESANTI-LOCK BRAKESANTI-LOCK BRAKE SYSTEM - 4WALBLEEDING BRAKE SYSTEMHYDRAULIC CONTROL UNIT (HCU)
1998 Mercury Mountaineer 5.0 P, AWD
Hydraulic Control Unit (HCU)
1998 Mercury Mountaineer 5.0 P, AWDSECTION Hydraulic Control Unit (HCU)
NOTE:
Perform HCU bleeding procedure if HCU has been replaced or HCU brakelines have been disconnected.
- Clean dirt from around master cylinder reservoir cap. Fill master cylinder reservoir with clean DOT 3 brake fluid. Connect drain hose to right rear bleeder screw. Submerge other end of hose in clear container full of clean brake fluid.
- Pump brake pedal, and then hold firm pressure on brake pedal. Loosen right rear bleeder screw until fluid flows from screw. Have an assistant maintain pressure on brake pedal while tightening bleeder screw. Repeat bleeding procedure until brake fluid flow is clear and free of bubbles. Refill master cylinder reservoir as necessary.
- Tighten right rear bleeder screw and remove drain hose. Proceed to left rear, right front and left front wheels in sequence. Install New Generation Star (NGS) tester with Cable (007-00531) to Data Link Connector (DLC) located behind left side of instrument panel, and follow NGS tester instructions. Repeat bleeding procedure for all 4 wheels.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.