Front brakes and the LQ-2

[Rawze]

(07-19-2020 )RocketScott Wrote:  '89 Pete 379, Cummins 444xt...

After getting my front brakes back together I fired the truck up to move it back to it's usual spot. When I applied the brakes I started losing a ton of air. The valve that splits the air at the front was just dumping air out of the exhaust port. Took it apart and it's toast, the seals are all hardened and cracked

After some poking around the web I figured out that it's an LQ-2 valve. The description says that they were used on 'pre FMVSS-121' vehicles. I've got a switch on the dash that says "slippery/dry" that cuts the front brake application by 50% when the roads are slippery. My front brakes haven't worked since owning the truck so I have no idea how well this system actually functions. I do know that they don't set trucks up like this anymore...

So my question is: Do I just replace the valve with the same or should I upgrade the front braking system to something closer to current standards (but without installing a full ABS system)?

Not sure if there's a better way to proportion the braking between front and back without going full ABS

Because it is a safety=-related issue...
maybe ask what the truck maker recommends. That way there is no personal liability if something does not work out, or some moron pulls out in front of you one day and it becomes part of some 'legal' issue .. you never know what the future holds.

If there is an update or TSB related to it, and you do not have it done,.. it would become your personal responsibility if something bad were to ever happen otherwise.

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And then there is the more obvious issue there too... It is safe to say that if you found one valve with rotted out guts in the brake system... ehemm.. you'de be best to replace ALL the safety-sensitive valves with rubber guts + all rubber hoses related to the braking system while you are at it. This is to protect yourself, the motoring public at large, and to prevent chasing gremlins.