What are the brakes on a Kelsey Hayes 4wal?
What are the brakes on a Kelsey Hayes 4wal?
KELSEY-HAYES 4WAL ELECTRO-HYDRAULIC CONTROL UNIT (EHCU) The EHCU contains six ABS solenoid valves, an isolation valve and a modulation valve for each of the three individual brake circuits. The EHCU also has a single pump motor that drives two separate pumps (one for the front brakes and the other for the rear brakes).
When did Kelsey Hayes come out with anti lock brakes?
In 1990, Kelsey-Hayes introduced a new four-wheel anti-lock braking system (EBC4) on General Motors M- and L-series minivans (Chevrolet Astro and GMC Safari). General Motors refers to the system as 4WAL.
How do you change the code on a Kelsey Hayes 4wal?
Turn the key on. 2. Insert the jumper or code key into the ALDL and short terminals A to H for 2 seconds. 3. Remove the jumper or code key for 2 seconds. 4. Reconnect for 2 more seconds. 5. Disconnect the jumper or code key. If the ANTILOCK and BRAKE lights come on for a couple of seconds, then stay off, the codes have been erased.
How do you turn on the antilock light on a Kelsey Hayes 4wal?
To begin, first make sure the brake pedal is released. Next, turn the key on, insert the code key or jumper A to H and wait for the ANTILOCK light to flash. A code 12 (2WD vehicles) or 14 (4WD applications) will flash three times.
What does Kelsey Hayes 4wal ABS system do?
The Kelsey-Hayes 4WAL ABS system has been used on many GM light trucks through the years. So chances are pretty good you’ll tangle with one real soon. Like all ABS, the 4WAL system is designed to keep the vehicle under control during heavy braking.
Turn the key on. 2. Insert the jumper or code key into the ALDL and short terminals A to H for 2 seconds. 3. Remove the jumper or code key for 2 seconds. 4. Reconnect for 2 more seconds. 5. Disconnect the jumper or code key. If the ANTILOCK and BRAKE lights come on for a couple of seconds, then stay off, the codes have been erased.
To begin, first make sure the brake pedal is released. Next, turn the key on, insert the code key or jumper A to H and wait for the ANTILOCK light to flash. A code 12 (2WD vehicles) or 14 (4WD applications) will flash three times.
How does Drac work on Kelsey Hayes 4wal?
The DRAC converts the AC sine wave from the VSS into a 50% duty cycle square wave. It then sends this signal to the ABS, speedometer, PCM and cruise control module, adjusting the ratio for each system. If the rear end ratio or tire diameter has been changed, the buffer should be replaced with one calibrated for these factors.
