I am bost sure if this feature is on my truck. The Rear Wheel Anti Lock
light does not come on as other lights do. But I do see a big aluminum block
in the engine compartment mounted on the fire wall on the passenger side.
What that block does? Is that a ABS control unit? One brake line runs right
through that block.
How do I know if I have ABS?
You get rear ABS standard.
The ABS computer is tucked inside the right rear frame rail, IIRC.
As for your light not coming on, check and change the bulb. That test
feature that flashes all the indicator lights at you when you start
the truck....tells you when you need to change said bulbs.
I couldn't tell you about that "block"...you truck *might* be fuel
injected...my 93 2.3L wasn't (drats!, still have that 2.6L
intake/harness sitting around), so that brake booster set-up might be
slightly different, for all I know.
The main CPU also controls the rear ABS. The device on the right frame rail
is a proportioning valve with a solenoid that relieves pressure to the rear
brakes when the CPU signals. On the top of the rear differential is a small
plug-like device with two wires coming out of it. That is the hall-effect
sensor that the CPU reads to determine when to trigger the
pressure-relieving proportioning valve. It is a primitive system by current
standards, and it failed not long after my '90 PU (2.6L) was out of
warranty. I suspect that the CPU is where the real fault is, for certain
it's not the proportioning valve or speed sensor because they've both been
replaced. After several "repairs" that never lasted long, I put a piece of
black tape over the ABS light. I *wish* that light would burn out, but the
damn thing seems likely to last as long as the truck & I'm far too apathetic
to get in there and remove the bulb.
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