Question

I have a 99 rangerover hse 4.6l, My problem is on application of the brake pedal the brake, traction control and ABS light light up for a split second i have tried the ABS and traction functionality and all appears to working correctly. I tried some basic tests i have checked ABS wheel sensors and plugs brake pedal switches, While trying to replicate the lights i held the brake pedal down and activated both brake switches above the pedal by hand with no activaction of the lights. Also i have noticed my Wabco electrical brake pump cycles every 1 minute or so. I had the key off and pumped the pedal 30-40 times and then switched the key back on and the brake pump was activated for about 30 seconds then it stopped and continued the cycle every minute. I am suspicious of my accumulator been faulty is there any way i can test this accumulator also the pump activates on every application of the pedal