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Old 04-02-2007, 09:38 PM
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Need 1990 Bronco II Rear Brake Help

Having a problem with my 1990 Bronco II rear ABS. No idea what it is.
Symptoms: No brake fluid or pressure getting to rear brake cylinders.

Diagnostics to this point:
1. Pressure and flow at Master cylider rear brake line.
2. Pressure and Flow at inlet side of Hydraulic Brake valve.
3. Nothing at outlet side of valve.

Repair attempts (with no success):
1. Replaced valve with one from salvage yard that appears all but new.
2. Checked speed sensor and resitance and it reads good.
3. No Anti Lock light on dash (except at intial statup which is normal).

I really need some help here. I've never seen this before and don't have a clue what to do now.


Last edited by LarryA; 04-02-2007 at 10:51 PM.
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