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.
Antilock Brake System (ABS) System Components
The MGH-25 ABS consists of a conventional hydraulic brake system plus antilock components. The conventional brake system includes a vacuum booster, master cylinder, front disc brakes, rear drum brakes, interconnecting hydraulic brake pipes and hoses, brake fluid level sensor, and the brake warning lamp indicator.
The antilock brake system (ABS) components include a hydraulic unit, an electronic brake control module (EBCM), system fuse, four wheel speed sensors, one at each wheel, interconnecting wiring, ABS indicator, the de-coupled dynamic rear proportioning (DDRP) indicator which is connected to the parking lamp, and the rear drum brakes. For the general layout of this system, refer to Antilock Brake System Component Views (Notchback) or Antilock Brake System Component Views (Hatchback) .
The hydraulic unit with the attached EBCM is located between the surge tank and the fire wall on the left side of the vehicle.
The basic hydraulic unit configuration consists of hydraulic check valves, two solenoid valves for each wheel, a hydraulic pump, two accumulators, and two dampers. The hydraulic unit controls hydraulic pressure to the front calipers and the rear wheel cylinders by modulating hydraulic pressure to prevent wheel lockup.
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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.