When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
After replacing MC and all my lines, and calipers, I'm having a problem that appears to be in the ABS HCU. Using a Motive bleeder both back and the left front calipers bleed with no issues. I get nothing out of the right front. What I have done so far:
Bleed using pressure - Both rears and left front bleed, right front nothing.
Using Forscan ABS bleed - ABS activates, pedal surges, Forscan shows bleed procedure complete, try bleeding all calipers, no change from above.
Tried using Motive pressure and Mity-vac at the same time on right front - no change.
I don't have any DTCs, and ABS dash light is not on (light check at key on is good).
Pedal is good not spongy at all.
I have loosened the fittings on ABS HCU and get fluid on both inputs, output to rear and output the left front, nothing from output to right front.
I have looked through the Ford shop manual, and can't find this problem.
Just my thinking-you've diagnosed the ABS module as bad. Fluid in but no fluid out to the one line would definitely be in the control unit. You can get a rebuilt one for around $350 to $400. There is a way to rebuild one-do a youtube search-they are for F150s.
There is a repair service for $130. Personally, that is the route I would go just because I'm cheap but not cheap enough to lose stomach lining and heart muscle over the thing.I just "duck duck"ed it. URL below. Hope that helps
I think the module itself is OK, since I have no codes and the ABS bleed completes and doesn't throw a code. I actually think that the pump side of things, more specifically a valve in the HCU is stuck or malfunctioning. I am going to give upfix a call and get their take on things.
Probably getting my terminology mixed up when I say module. ..I think your issue lies within the manifold (metering block) part. There are 2 ports on top of the block slightly behind the brake line connections. You can supposedly use those ports to check valves but I have no idea how. If there was any crud in the MC-that would be a prime place to create a blockage. There in lies the dangers of flushing a system but you have to do it. Let us know how it all turns out. Good luck!
There are 2 ports on top of the block slightly behind the brake line connections. You can supposedly use those ports to check valves but I have no idea how.
That is to check for a soft or excessive pedal travel, which is not one of my symptoms. Here is the procedure if anyone is interested.
From the shop manual:
I haven't done this since I haven't had any help when I've been working on it. I will probably do this, although without a soft pedal I don't think this is relevant.
I Talked to Upfix this morning and the fact that I have no codes, and the ABS bleed completes with no errors, they believe that it is not the module. The module is the only part that they work on. They don't repair the HCU. I think I'm going to try to get one from a junkyard and see if that fixes the problem.
Is this the part you looking for? . "Valve Block" was the term I was hunting for the other night. I try to learn terminology on things and sometimes it is maddening. Some call the module the ABS computer instead of HCU or EHCU, then some call the whole thing the pump assembly or EHCU yada yada yada. I think your term for HCU and module make more sense. The valve block part of the HCU is what I thought might be your issue...so this guy is what you are hunting-correct? They are around $100 on ebay.
That's it. That is the HCU and the ABS module both. I've got a couple leads on some in a few junkyards. I just have to go look at them as there are 2 varieties. The one you posted a picture of and the one that is drawn in the shop manual pages that I posted. They are similar but not the same.
What part of Montana do you live in? We are heading out to Big Sky in August to visit my niece, then down to Idaho to see our son.
I had the about the same issue several years back. Do a search on "paper clip test" for that module. Mine tested bad, so I located one in a wrecking yard and replaced it...problem solved...
UPDATE
I made it down to Texas and found an HCU and Module at a junk yard and pulled it. Had a number of things that I was working on. I had pulled the EX outside to let it run awhile. It seemed like the brake pedal got a little spongy when I pulled the EX outside, but not terrible. After that the EX sat while I had another trip and was working on other projects. Went back to work on the brake situation and was getting ready to swap out the HCU and Module. I decided to try and bleed the right front brake (the one that wouldn't bleed before), and it bled fine. The only thing I can figure is that when originally bleeding the brakes, I had used the Motive pressure bleeder, pushed the brake pedal, and used Forscan bleed procedure. But I had not had the truck running while pushing the brake pedal. I must have had a stuck valve in the HCU and the higher pressure with the truck running unstuck the valve. That's all a guess as I can't completely remember what order I did things. At least I got the extra parts that are NLA.
