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5th Gen 4Runner: KDSS warning, fluid leak, or clunking and uneven ride on a KDSS truck

Checks, in order

  1. Confirm the truck has KDSS
    Look at the front and rear sway bar area: KDSS trucks have hydraulic cylinders on the bars with hoses running to a central accumulator unit instead of plain sway bar links. Check the build sheet or window sticker if unsure.
    easy $ · under about $50
  2. Look for wet fittings
    Inspect the cylinders, hoses and accumulator for oily wetness or fresh dirt stuck to fluid. Compare left and right, and check the area directly below for drips on the garage floor.
    easy $ · under about $50
  3. Check ride height and body lean
    Park on level ground and compare the left and right body height. Take a corner at moderate speed; excess lean or a floaty feel after a leak means the system has lost pressure.
    easy $ · under about $50
  4. Inspect for corrosion
    Look at the cylinder rods and mounting points for pitting or rust, which is a common reason the seals start to weep. Salt state trucks are more likely to show it.
    medium $ · under about $50
  5. Repair or replace
    Dealers typically replace failed components. Some owners swap in conventional sway bars instead, which costs less but changes the factory ride and off-road flex, so understand the trade-off first.
    hard $$$ · shop-level job, $500+

Applies to: 5th generation 4Runner, 2010 to 2024, with the 1GR-FE 4.0L V6 and the 5-speed automatic. Assumes the stock configuration; trim-specific items (KDSS, sunroof, A/C) are noted where they apply.

Tools and parts for these checks

Links below are Amazon affiliate links: as an Amazon Associate, toyotadata earns from qualifying purchases, at no extra cost to you. Confirm fitment for your exact truck before you order.

ITEMUSED FORBUY
Pry bar setChecking ball joints, bushings and tie rod ends for playShop on Amazon
Sway bar end linksA common clunk source and a cheap fixShop on Amazon
Outer tie rod endsReplacing worn tie rod endsShop on Amazon
UV leak detection kitPinpointing exactly where a leak startsShop on Amazon

More 5th Gen 4Runner problems

All 16 5th Gen 4Runner symptoms in the interactive troubleshooter →

General guidance from owner experience. Confirm torque specs, fluid capacities and procedures in the factory service manual. Brakes, steering and anything structural: if in doubt, have a qualified shop inspect it before driving.