Nissan/Datsun 200SX/510/610/710/810/Maxima 1973-1984 Repair Guide

Brake Proportioning Valve


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Fig. Fig. 1 View of a typical proportioning valve-most models similar

All Datsun/Nissans covered in this guide are equipped with brake proportioning valves of several different types. The valves all do the same job, which is to separate the front and rear brake lines, allowing them to function independently, and preventing the rear brakes from locking before the front brakes. Damage, such as brake line leakage, in either the front or rear brake system will not affect the normal operation of the unaffected system. If, in the event of a panic stop, the rear brakes lock up before the front brakes, it could mean the proportioning valve is defective. In that case, replace the entire proportioning valve.


  1. Disconnect and plug the brake lines at the valve.
  3. Unscrew the mounting bolt(s) and remove the valve.

Do not disassemble the valve.

  1. Installation is in the reverse order of removal. Bleed the system.