abs and brake lights come on?????????
- Thread starter sc_marine
- Start date
TbirdSCFan
Registered User
If they go off after coming on, the likely cause is a worn out ABS accumulator. Do this test:
Driveway testing the operation of your HCU (Hydraulic control Unit):
1. Your HCU consists of a hydraulic pump, brake fluid reservoir, accumulator, solenoid valve body, pressure switch, and main body valve.
2. To driveway test the unit, turn key on/run (not just acc), engine off.
3. Listen for the pump charging the accumulator. Its a faint whine followed by a clunk over on the passenger side firewall. This should last for no more than a minute and the anti-lock and brake lights should both go out.
4. Depress the brake pedal numerous times, and count the number of presses you get before the pump motor starts again. 2 or less is a sign of a problem, especially if the anti-lock/brake lights come on and go off momentarily.
5. If you don't hear the sounds, you could have a bad set of relays, a bad pump motor, or pressure switch. If your pedal press count is low, its likely the accumulator.
Driveway testing the operation of your HCU (Hydraulic control Unit):
1. Your HCU consists of a hydraulic pump, brake fluid reservoir, accumulator, solenoid valve body, pressure switch, and main body valve.
2. To driveway test the unit, turn key on/run (not just acc), engine off.
3. Listen for the pump charging the accumulator. Its a faint whine followed by a clunk over on the passenger side firewall. This should last for no more than a minute and the anti-lock and brake lights should both go out.
4. Depress the brake pedal numerous times, and count the number of presses you get before the pump motor starts again. 2 or less is a sign of a problem, especially if the anti-lock/brake lights come on and go off momentarily.
5. If you don't hear the sounds, you could have a bad set of relays, a bad pump motor, or pressure switch. If your pedal press count is low, its likely the accumulator.