1995 Honda Odyssey Owner's Manual - Page 218
1995 Honda Odyssey Manual
Page 218 highlights
Anti-lock Brake System The Anti-lock Brake System (ABS) is standard equipment on all U.S. models and the Canadian sixpassenger model. It is optional on the Canadian seven-passenger model. The ABS works by measuring how fast the wheels are turning during braking and comparing their speed. If any wheel is rotating much slower than the others (on the verge of locking up and skidding), the system reduces hydraulic pressure to that wheel's brake caliper. When that wheel's speed matches the other wheels, the system applies normal hydraulic pressure. This can take place several times per second at each wheel. You feel the ABS working as rapid pulsations in the brake pedal. Each wheel has a wheel speed sensor assembly. As the wheel rotates, the sensor sends electrical pulses to the ABS control unit. The pulse frequency varies with the wheel speed. The electrical output of the ABS control unit is connected to the modulator/solenoid unit. During braking, the ABS control unit monitors the pulse frequencies from the four wheels. When the control unit detects a wheel locking up, it energizes the appropriate solenoid in the modulator/solenoid unit. There are six solenoids: two for each front wheel, and two for the rear wheels. The energized solenoid reduces hydraulic pressure to one side of a modulator valve. This, in turn, reduces hydraulic pressure in the brake line going to the affected wheel. When that wheel speeds up because of the reduced braking effort, the control unit de-energizes the solenoid. This builds hydraulic pressure on the modulator valve. The pressure increases in the hydraulic line to the wheel. For the system to react quickly, the modulator/solenoid unit must have brake fluid under high pressure. This is supplied by a piston-type accumulator that is pressurized by an electric pump. A pressure-sensing switch on the accumulator controls this pump. The control unit also contains error detection circuitry. It monitors the operation of the wheel sensors, solenoids, pump, and electronics. If the control unit detects any faults, it shuts off power to the pump motor and solenoids. The light on the instrument panel comes on. The brakes then work like a conventional system without anti-lock capabilities. Technical Information