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Old 05-22-2018, 12:37 PM   #1
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Cruise Control quits intermittently

Hi all my cruise control sometimes randomly turns off while on cruise, I press the resume button and it comes back on immediately. Having said that it does come on every time i engage it.

Recently I did do the Hydroboost swap with same year Van parts. I have a feeling it is something to do with the brakes. For whatever reason brake must send a signal that it has been tapped and cruise disengages.

My question to you experts is:

- Is the brake light switch on the pedal is what the computer uses to disengage the cruise when pressed?

- Or is it one of the pressure sensors on the Master Cylinder? If yes which one is it, because i see two sensors?

- Also I did not bleed the lines yet, did bleed the Master Cylinder though. Could that be a problem? FYI: Braking power is fine.
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Old 05-22-2018, 01:58 PM   #2
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I have that issue once in a blue moon...now curious......2008 5.4L


..I always assumed that the cruise defeat was just in the brake light switch circuit, but never really investigated it....so hoping to learn something here.
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Old 05-22-2018, 02:23 PM   #3
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My ebrake cables are currently missing. To get the brake light off so the cc will work I have to use a small bungee to hold the foot pedal up. I noticed a few months ago that the cc wasnít working and the ebrake warning light wasnít on. I fumbled around with the foot pedal for a sec and was able to get the brake lever up just a smidge. Went and tried it again and it worked. So not sure if itís the actual indash light thatís the show stopper or not, but it doesnít seem like it to me. Since it was on the freeway I didnít investigate further but maybe thereís another switch or something that allows the cc to work on the foot pedal??
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Old 05-22-2018, 02:52 PM   #4
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The buttons on the wheel could also be failing... had that happen to me once.
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Old 05-23-2018, 09:17 PM   #5
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Pretty common cause of the cruise control dropping out is due to the "safety" switch on the bottom of the master cylinder. Kit #SW-6350 or 1L1Z-9F924-AA is an easy fix. Just unscrew the old one and in with the new. Done several and usually only lose a few drops of fluid.
Bought 'em here: https://www.amazon.com/Motorcraft-SW.../dp/B000IYLZDO

Good luck.
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Old 05-24-2018, 12:04 AM   #6
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Cruise control monitors both the M/C and pedal switch, and also the parking-brake light (since that doubles as the brake system fault light). Scatter is correct that the M/C sensor is the most common to fail, which is why Ford issued that huge recall a while back.
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Old 05-24-2018, 08:46 AM   #7
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Thanks guys will change the safety switch and see what happens.
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Old 05-24-2018, 09:11 AM   #8
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The CC worked intermittently or not at all on my van. Turned out the brake pressure switch on the master cylinder was the culprit. I used a small piece of wire to 'jumper' connect the female plug from the pressure switch as a test to see if I could get it working. The jumper works so well replacing the switch has gone way down on my to-do list. Hopefully your issue is the same, and as easy.

For reference:
http://www.sportsmobileforum.com/for...tml#post124193
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Old 05-24-2018, 01:29 PM   #9
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Just replaced the pressure switch..... now need to go for a long drive to see if it fixed the problem.

My problem is only limited to CC intermittently cancelling itself while it is set. But it does come on every time i try to engage it or re-engage it
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Old 05-26-2018, 11:45 PM   #10
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Thanks guys the MC sensor fixed the issue.
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