OEM Toyota Tacoma Brake Proportioning Valve

Toyota Tacoma Brake Proportioning Valve Parts and Q&A

• Valve Assembly, Rear
  47910-35320
  Q: How to service and repair the Brake Proportioning Valve on Toyota Tacoma?

  A:

  The Brake Proportioning/Combination Valve servicing starts with bracket removal of the valve which requires removing the bolt and nut along with two plate washers. The Brake Proportioning/Combination Valve requires users to remove 2 nuts and flexible hose brackets from 2WD (except pre runner). For 4WD and pre runner models, users should remove 2 nuts and their valve bracket together with the set plate. The service begins with spring-valve disconnection through plier use to unclip and remove the spring. Detach shackles No. 1 and No. 2 through the sequence of nut and bolt removal and subsequent removal of the load sensing spring together with 2 plate washers after deteriorating the 2 nuts and washer connection. A technician must remove four bushings together with two collars, two rubber plates and the load sensing valve boot while the load sensing spring boot. Check if the valve piston pin and the load sensing contact surface exceeds 0.7 mm (0.028 inch) wear limit. Reassemble the load sensing system by first installing the load sensing valve boot and load sensing spring boot before placing on the system 2 rubber plates and 2 collars and 4 bushings while applying lithium soap-base glycol grease to all rubbing parts and checking load sensing spring orientation. Fasten shackle No. 1 to shackle No. 2 while using the lock nut washer and torquing the nut to 13 Nm (130 kgf-cm, 9 ft. lbs.). Install the plate washers on shackle No. 1 followed by securing them with a bolt and nut fastened to 18 Nm (185 kgf-cm, 13 ft. lbs.). Fitting the load sensing spring to its load sensing valve requires a clip before you reinstall the valve bracket through the set plate installed on the valve assembly and provisionally tightening its two valve body mounting nuts while ensuring 2WD (except pre runner) has its flexible hose bracket in place. Use the bolt along with 2 plate washers to install it before torquing them to 13 Nm (130 kgf-cm, 9 ft. lbs.).