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ABS Shuttle valve switch kit with seals, Discovery II


Remedy most Land Rover Discovery II ABS Shuttle Valve Fault codes causing the "tres amigos".  Kit includes the seals which seeped and ruined the shuttle valve switches, plus a new genuine WABCO switch pack, plus new type retaining clips.

Anyone selling these switches without new seals is doing you a disservice.  Also note that "O" rings are NOT a satisfactory replacement for the original hydraulic seals.

Our kit addresses modulator brake fluid leaks into the switches ... the cause, not just the symptom. The fluid leaks will usually not drip on the ground, but can clearly be seen once the switches are removed.  Also note that the SLABS system performs a self-test every cycle of the key, and if the lights are out at first this is because the switches' signal was good at startup.  Once the warning lights come on they remain until the ignition is cycled.

In our workshop we offer an unprecedented two-year warranty, and just fitting the cheaper Rover shuttle valve switch (SVS) kit everyone sells is not adequate.  Hence, our solution: tried and tested. 

More info on Disco 2 "three-amigos":  It literally means the ABS, Traction Control, and Hill Decent warning lights all come on at the same time, sometimes followed by the red "brake" light.  This only happens when a fault occurs which is common to all three systems.  Wet Shuttle Valve Switches are one of the most common causes. 

One of the Usual Suspects is flogging just the switches claiming a "99% success rate" at  repairing the three warning lamps.  Wrong.  Just shows they don't know about these brake systems.  There is another tres-amigos cause to test for, while installing this kit:  The instruction information provided with this kit explains how to do this test.  There is a circuit board, within the modulator between the shuttle valve switches themselves, and the main harness connector to the modulator.  If intermittent through the modulator board, our kit will not repair that aspect.  The poor connection is generally a cracked solder-joint on the board in the solenoid block which goes from the shuttle valve switches to the modulator main connector, and it must be located and repaired or bypassed with solid wires.  Alternatively the whole block can be replaced (Land Rover SWO500040, per TSB LTB00060), as so many are doing these days, ignoring the obvious brake fluid leaks. 

Wheel speed sensors are common to the amigos too.  Again, our kit will not repair the circuit board or speed sensors: it only addresses the normal and most common problem causing the three amber warning lights. Wheel speed sensors on the Discovery 2 fail by cracking the wire that goes into the bobbin where the wheel sensor enters the hub.  The skillful can repair these.  If you prefer to replace the offending sensor, but not the overlay harness supplied with all new sensors, it is perfectly acceptable to cut the old sensor connector off, and solder it onto the new sensor wires.  Just be sure to heat-shrink insulate, and seal the connection with a non-conductive and non-corrosive silicone to keep water out.  Otherwise, you may be seeing the 3 amigos for an unexpected visit.

Shuttle valve seals begin to leak brake fluid at around 70k miles, regardless.  No magic -- just a reality -- and the juice falls into the switches. We suggest changing the seals at the 60k and 120k Services.  When the modulator is removed for service, always test the switches and modulator board for continuity too, and repair as necessary.  But remember, this FW66 kit is for trouble codes (11,6; 11,4) or brake fluid loss.  If changing only the seals, and the switches are still good, you will not need this whole kit, just get the seal and clip kit alone.

Kit fits all NAS Land Rover Discovery Series II, ROW LR2 (we are told it also fits Hummer with WABCO modulator).  Includes genuine SVS pack, valve seals, upgraded valve seal retainers, and instructions.  Note that the brakes will need to be bled after installation of shuttle valve seals, and this will require a Land Rover-specific diagnostic computer.  For DIY Disco owners here are some computer interface options to consider.

Australia customers, please email with your address for correct carriage cost: this website estimator will be excessive every time.

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  • Model: fw66
  • Manufactured by: Falconworks

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