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clio 172 brake problems? please help

  clio 172 sport 2002
hi i have a 2002 clio 172. it has only covered 60k miles.

when driving if i accelerate quite quick and apply the brakes the pedal goes rock hard? then as the revs go down the brake comes to life?

abs light and serv light occasionally come on too.

it only does this problem occasionally.

i have had diagnostics and it showed wheel .one of 4? ?

i have checked all abs rings and they are fine.

please help experts.

anyone else had same problem??

could it be abs pump?

vacuum looks fine.

could it be servo?