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Does anyone have the port layout for a 03 f350 abs hcu? I don't know which port is the front left and front right, I know some of them from memory but forgot which ones are the front ones.
If anyone has a diagram of the hcu or could look at there's and let me know or even pictures I'd greatly appreciate it.
I think 01 to 04 are the same layout too.
1. Rear out to brakes
2. Front left to brake
3. Front right to brake
4. Rear brake circuit in from MC
5. Front brake circuit in from MC
I have uncovered my HCU is having issues and have the unit like the one above. My truck started occasionally pulling left when braking like the passenger side front caliper wasn't working. To get it corrected I would have to mash the braked pedal to get it corrected. I replaced the master cylinder thinking that was the issue and went ahead and replaced the hydroboost while in there because it did have a slight drip on the inside of the firewall. When that didn't correct the issue of the brake pedal slowly sinking to the floor when coming to a stop I tested the HCU and found #7 valve was bypassing when the brake pedal was applied in doing the test. So this is what I believe the correlated numbers go to:
1. Inlet from master cylinder for front.
2. Inlet from master cylinder for back.
3. Outlet for back brake calipers.
4. Outlet for front passenger side brake caliper.
5. Outlet for front drivers side brake caliper.
6. Bore valve for front drivers side brake caliper.
7. Bore valve for front passenger side brake caliper.
I am assuming numbers 4 through 7 given the bore valve closest to the master cylinder...number 7...is the one that moved during testing. Bore valve number 6 which is towards the front of the vehicle did not move during testing, so I assumed this one went to the front drivers side caliper and it is directly adjacent from outlet line number 5. Respectfully bore valve number 7 is directly adjacent to outlet line number 4.
Does anyone know what the bore valve between the front inlet line number 1 and the bore valve number 6 goes to? I removed the rubber cap and inserted the testing mechanism and it had a depth of about 9/16", whereas the other two numbers 6 and 7 bore valves had a depth of about 2-1/2" with the testing mechanism.
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