Question 1

How to service and repair a Brake Proportioning Valve on Toyota Tundra?

Accepted Answer

The service procedure for the Load Sensing Proportioning and By-Pass Valve (LSP & BV) starts by disconnecting shackle No.2 from its bracket through bushing removal until shackle No.2 comes off along with taking out the 2 bushings and collar and finally the 2 bolts and shackle bracket. Use Special Service Tool: 09751-36011 to disconnect the 3 brake lines from the valve body. Then, remove the LSP & BV assembly after disconnecting its 2 valve bracket mounting bolts. The Blend Proportioning Valve requires three securing bolts to be removed after disconnecting the four brake lines when a torque of 29 Nm (296 kgf-cm, 21 ft. lbs.) has been achieved. Install the LSP & BV assembly by first placing its position and then securing it using the 2 valve bracket mounting bolts while torquing to 29 Nm (300 kgf-cm, 22 ft. lbs.). Specially designed tool 09751-36011 is used to connect the three brake lines where torque must be set to 15 Nm (155 kgf-cm, 11 ft. lbs.). Secure dimension A to 120 mm (4.72 inch) then fasten the lock nut to 13 Nm (130 kgf-cm, 9 ft. lbs.) afterward add the shackle bracket followed by 2 bolts secured at 29 Nm (300 kgf-cm, 22 ft. lbs.). Insert the shackle bracket by connecting its bushings with collar and shackle No.2 while tightening it to 13 Nm (130 kgf-cm, 9 ft. lbs.). Install the cushion retainer and its matching nut. Position the valve body by manually pulling down the load sensing spring which should move valve piston down smoothly until the piston lightly touches the spring. Tighten its mounting nuts to 13 Nm (130 kgf-cm, 9 ft. lbs.). Brake line bleeding must occur before checking and adjusting fluid pressure levels of both the LSP and BV.

Question 2

How to service and repair a Brake Proportioning Valve on Toyota Tacoma?

Accepted Answer

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.

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