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Hi JoseM
All the systems are the same .There is no proportioning valve the only valve is the load sensing valve.
Your problem can be solved by increasing the booster output , replacing the master with a smaller diameter one [not recommended ] You can also fit high coefficient brake pads.
If the load sensing valve is not adjusted or working properly you can either over brake or under brake the rear which will effect overall braking.
also check the vacuum output ant the booster through the whole braking range
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