OEM 2004 Toyota Tacoma Brake Proportioning Valve

2004 Toyota Tacoma Parts Questions & Experts Answers

• Q: How to service and repair a Brake Proportioning Valve on 2004 Toyota Tacoma?

  A: You should start LSP & BV servicing by separating shackle No. 2 from its bracket through the removal of the nut along with cushion retainer and 2 cushions and collar. Disconnection of brake lines from the valve body requires the usage of Special Service Tool: 09023-00100 to remove the LSP & BV assembly. The LSP & BV service requires 2WD (except pre runner) operators to first remove the flexible hose bracket clip before disassembling the assembly by taking out 3 valve bracket mounting bolts and spacer. The removal of the flexible hose bracket mounting bolt is necessary for 4WD and pre runner systems alongside their counterparts. First separate the valve bracket by unfastening the nut and bolt with its two plate washers; afterwards detach the valve bracket and set plate from the valve body by removing the 2 nuts and flexible hose bracket for 2WD (except pre runner); however for 4WD and pre runner systems only unfasten the 2 nuts. Untie the spring from the valve by removing its retaining clip with spring then remove shackles No. 1 and No. 2 following the removal of the nut and bolt before loosening the 2 nuts and washer to separate shackle No. 1. Detach the load sensing spring through the removal of four bushings combined with two rubber plates, two collars alongside the load sensing valve boot and load sensing spring boot. Check the valve piston pin along with the load sensing contact surface for wear at a maximum threshold of 0.7 mm (0.028 inch). The first step for assembly includes placing the load sensing spring while mounting the load sensing valve boot and load sensing spring boot then installing 2 rubber plates followed by 2 collars and 4 bushings and applying lithium soap-base glycol grease to all contact surfaces. Follow up the mounting of shackle No. 1 and shackle No. 2 by making certain to tighten the nut to 13 Nm (130 kgf-cm, 9 ft. lbs.). Insert the load sensing spring through shackle No. 1 while placing two plate washers before securing it with a bolt and nut applied at 18 Nm (185 kgf-cm, 13 ft. lbs.) torque. Next, fix the load sensing spring to the valve body through the clip installation. The new valve bracket installation requires attachment of the set plate to the valve assembly through the bracket while temporarily fastening the 2 valve body nuts before bolt and nut tightening to reach 13 Nm torque (130 kgf-cm, 9 ft. lbs.). The installation process begins with securing three valve bracket mounting bolts along with a spacer while torquing them to 29 Nm (300 kgf-cm, 22 ft. lbs.) for vehicles based on 2WD (except pre runner) or by including the flexible hose bracket mounting bolt for both 4WD and pre runner models. Follow the installation procedure by using Special Service Tool: 09023-00100 to torque the brake line to 15 Nm (155 kgf-cm, 11 ft. lbs.). Shackle No. 2 receives attachment to the shackle bracket through two nuts while tightening the lock nut at 13 Nm (130 kgf-cm 9 ft. lbs.). Installation of shackle No. 2 with its pair of cushions and collar into the shackle bracket requires securing the cushion retainer by nut torque to 13 Nm (130 kgf-cm 9 ft. lbs.). After applying the correct rear axle load place the valve body so its piston touches the load sensing spring lightly before torquing mounting nuts to 13 Nm (130 kgf-cm, 9 ft. lbs.). The brake line needs bleeding as the final step before checking and adjusting the LSP & BV fluid pressure levels.