Symptoms
Hydraulic fluid on the chassis or around the anti-roll bars, ACE warning, body roll returning. Pipes rust through and the aluminium valve block pits until its seals fail.
The fix, step by step
- Trace the leak: pump banjo, steel lines along the chassis, actuator seals or the valve block.
- Replace corroded pipes with new Dowty washers (an NHTSA recall had dealers re-torque or replace the pump banjo bolt).
- Change the high-pressure filter in the bottom of the valve block at 72,000 miles: heat the steel cap, use a 10 mm hex, pull the filter straight out with an M6 bolt, refit at 35 Nm.
- Refill with Land Rover PAS fluid STC50519, which ACE shares with the steering.
- Owners who give up fit standard anti-roll bars and a non-ACE belt.
Tools & part numbers
- 10 mm hex socket, breaker bar, heat, flare spanners
- pipes, Dowty washers, filter, fluid
Where to buy the parts
RVJ100010 ACE filter and plugLR Direct ↗Amazon ↗
RYF100420 Dowty sealing washer, ACE pipesLR Direct ↗Amazon ↗
RQB000390 ACE high-pressure rear pipe to actuatorLR Direct ↗Amazon ↗
STC50519 power steering / ACE fluidLR Direct ↗Amazon ↗
Hunting a used or discontinued part? Search eBay Motors for Land Rover Discovery Series II 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.