Symptoms
Weak rear braking or a changed pedal feel after lifting the truck, because the load-sensing proportioning valve (LSPV) now reads the truck as lightly loaded.
The fix, step by step
- An owner's measurement in Slee's guide: the LSPV contact point sits 38 mm from the pivot on a rod about 600 mm long, so movement at the rod end is about 1/15.75 of the movement at the valve body.
- For a 75 mm lift, lower the LSPV body by about 4.8 mm, then fine-tune with the rod-end adjuster (about ±6 mm).
- Mark the original position before you move anything.
Tools & part numbers
- Wrenches
- ruler or calipers
- paint pen to mark the start point.
Where to buy the parts
80 Series extended brake lines for 3–6" liftsMetal Tech 4x4 ↗Amazon ↗
DOT 3 brake fluid for the post-adjustment bleed (1995 4.5L)RockAuto ↗Amazon ↗
Hunting a used or discontinued part? Search eBay Motors for Toyota Land Cruiser 80 Series parts →
Rated for a competent home mechanic with a decent tool kit. Confirm torque figures, fluids and procedures against the factory service manual for your VIN, support the truck on stands rather than a jack, and work at your own risk (disclaimer). Some parts links are affiliate links, which pay us a small commission at no cost to you.