Seems to be an issue with air in the brakes or either within the electro valves or the wiring to them.

ELECTRO-VALVE TESTS

All tests performed with ABS ECU unplugged and ignition switched OFF unless stated otherwise.

Resistance Test 1
-- Connect ohmmeter between ECU connector terminals 1 and 11
-- Resistance should be lower than 1 ohm
-- If value is not correct, check for continuity between ECU connector terminal 11 and electro-valve connector terminal 7 (brown wire), and check that terminal 7 on the electro-valve (corresponding with the brown wire) is earthed.

Resistance Test 2
-- Connect ohmmeter between ECU connector terminals :

• 11 and 15
• 11 and 17
• 11 and 35
• 11 and 33
• 11 and 16
• 11 and 34

-- Resistance for each electro-valve should be between 3 and 7 ohms.
-- If not, remove connector from electro-valve, and check resistance between the following electro-valve terminals (the brown wire is terminal 7):

• 1 & 7 (LH front inlet valve)
• 2 & 7 (LH front outlet valve)
• 3 & 7 (rear inlet valve)
• 4 & 7 (rear outlet valve)
• 5 & 7 (RH front outlet valve)
• 6 & 7 (RH front inlet valve)

-- If one of the values is not correct (3 to 7 ohms), replace electro-valve/master cylinder assembly.
-- If the values are correct, check for continuity between control electro-valve connector and ECU connector.

• ABS ECU connector terminal 15 & electro-valve terminal 1
• ABS ECU connector terminal 34 & electro-valve terminal 2
• ABS ECU connector terminal 17 & electro-valve terminal 3
• ABS ECU connector terminal 33 & electro-valve terminal 4
• ABS ECU connector terminal 16 & electro-valve terminal 5
• ABS ECU connector terminal 35 & electro-valve terminal 6

Operation Test
IMPORTANT : Do not energize electro-valves for more than 60 sec.
-- Jack up vehicle to turn wheels.
-- Switch Ignition to position I
-- Wait for ABS pump to stop
-- Switch ignition OFF
-- Connect short jumper wire between ECU connector terminals 2 & 8
-- To test left front wheel valves, connect short jumper wires between ECU connector terminals 3 and 16 and 35. Depress brake pedal to lock wheel. If ignition now switched to position II, wheel should be free to rotate.
-- Repeat test for right front wheel, using short jumper wires between ECU connector terminals 3 and 15 and 34.
-- Repeat test for rear wheels, using short jumper wires between ECU connector terminals 3 and 17 and 33.
-- If one of these checks is not correct, but the wiring checks out OK, replace electro-valve assembly.