OEM Toyota Tundra Brake Proportioning Valve

Toyota Tundra Brake Proportioning Valve Parts Questions & Experts Answers

• Load Proportioning Valve
  47910-34070
  Q: How to service and repair the Brake Proportioning Valve on Toyota Tundra?

  A: Service and repair of the Brake Proportioning/Combination Valve begins with removing the valve bracket through its nut, washer, bolt and plate washers followed by the 2 nuts and 2 washers and set plate and valve bracket from the valve body. The valve spring can be disconnected through plier usage which removes the clip then the spring. Disconnect shackle No.1 and shackle No.2 by taking off the nut washer and bolt together with the load sensing spring and 2 plate washers and then lightly loosen the 2 nuts and plate washer plate to separate shackle No.1 from shackle No.2 The load sensing spring disassembly requires removal of 4 bushings and 2 collars in sequence followed by uninstallation of the load sensing valve boot and load sensing spring boot. Check the valve piston pin along with the load sensing contact surface for wear until it reaches 0.7 mm (0.028 inch) beyond the allowed maximum limit. When reconnecting the system install the load sensing valve boot and load sensing spring boot before placing the 2 collars followed by the 4 bushings while applying lithium soap-base glycol grease to all contact areas and aligning the load sensing spring correctly. First bolt shackle No.1 to shackle No.2 by fastening the lock nut and plate washer between the shackle components then tighten the upper nut to 13 Nm (130 kgf-cm, 9 ft. lbs.). The spring of the load sensing assembly should have 2 plate washers applied before the bolt installation, washer, and finally the nut which should be tightened to 18 Nm (185 kgf-cm, 13 ft. lbs.). Screw the load sensing spring into the load sensing valve using the clip before you install the valve bracket by establishing the set plate between the valve bracket and load sensing valve and then tighten the 2 washers and 2 nuts as a temporary step before installing the load sensing spring assembly followed by 2 plate washers bolt washer nut that should be torqued to 18 Nm (185 kgf-cm, 13 ft. lbs.).