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Service Brake Locking on

Hi, I have a problem with a 7FBMF locking its brakes on when steering is on full lock.
I have swapped the brake valve , brake master cylinder and orbitrol valve from a good truck and it still does it.
The brake pedal feels hard its not a problem with the brakes sticking as when the pressure relives the wheels turn ok.
Don't know what to try next.
  • Posted 26 Oct 2018 05:28
  • By stratosphere
  • joined 26 Oct'18 - 3 messages
  • United Kingdom
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The problem was a pinched return pipe from the valve back to tank squashed by the battery.
  • Posted 25 Nov 2020 07:07
  • By stratosphere
  • joined 26 Oct'18 - 3 messages
  • United Kingdom
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