What is it?

The connection for the wires is leaking brake fluid and im trying to figure out what it is so i can replace it.

Iv searched and haven't found anything that says for sure what it is. any ideas.


Thanks

 

Could it be something like a proportioning valve? Is there brake lines going to both ends of the truck? Maybe some kind of anti lock brake sensor? Sorry I never saw one of those just thought maybe could be one of those.

 

Ya, i guess i should have given some more info on it.

Its on the rear brake line right before the r-abs unit. Its what looks like a pressure sensor on it. It only has 2 wires going to it.

I thought it might be the porpotioning valve but it seems to small and it only has the 2 wires, but its the only thing on the r brake line other then the r-abs unit.

Any ideas
Thanks

 

It is probably the isolation valve for the RABS, here is a description of how the RABS operates according to my 1997 service manual.

The rear anti-lock brake system (RABS) continuously monitors rear wheel speed with a rear brake anti-lock sensor mounted in the rear differential case. When the teeth on the rear brake anti-lock sensor ring, mounted on the ring gear, pass the RABS sensor pole piece, an AC voltage is induced in the sensor circuit with a frequency proportional to the average rear wheel speed. In the event of an impending lockup during braking, at vehicle speeds above approximately 8 kph (5 mph), the anti-lock electronic control module senses the drop in rear wheel speed. If the rate of deceleration is excessive, the anti-lock electronic control module activates the RABS valve, causing the isolation valve to close. With the isolation valve closed, the rear wheel cylinders (2261) are isolated from the brake master cylinder and the rear brake fluid pressure cannot increase. If the rate of deceleration is still excessive, the anti-lock electronic control module will energize the dump solenoid with a series of rapid pulses to bleed the rear wheel cylinder fluid into an accumulator built into the RABS valve. This reduces the rear wheel cylinder brake fluid pressure and allows the wheels (1007) to spin at vehicle speed. The anti-lock electronic control module pulses the dump and isolation solenoids in a manner that will keep the wheels rotating while still maintaining high levels of deceleration during braking.

Once stopped, the operator releases the brake pedal (2455), the isolation valve de-energizes and any fluid in the accumulator returns to the brake master cylinder. Normal brake operation resumes.