Cruise control disengageing
#22
#23
#26
I will bet the master cylinder pressure switch is being opened due to rising pressure for some reason.
If you put a shunt connection across the switch plug and CC holds over an extended time period , it should prove the cause.
If that should be the case, the master cylinder may need to be replaced.
.
The master cylinder switch is a special design originally developed by Texas Instruments company, years ago.
It has to be sensitive to low pressure to open the contacts and and standup under very high pressures when brakes are applied normally, that ranges in the hundreds of pounds pressure.
As we find, not every company pays attention to the production quality and specs for the switch application they put out for vendor sale.
Good luck.
If you put a shunt connection across the switch plug and CC holds over an extended time period , it should prove the cause.
If that should be the case, the master cylinder may need to be replaced.
.
The master cylinder switch is a special design originally developed by Texas Instruments company, years ago.
It has to be sensitive to low pressure to open the contacts and and standup under very high pressures when brakes are applied normally, that ranges in the hundreds of pounds pressure.
As we find, not every company pays attention to the production quality and specs for the switch application they put out for vendor sale.
Good luck.
Last edited by Bluegrass; 11-24-2015 at 10:07 PM.
#28
#29
I have this problem but it only disengages when it's cold outside (40 degrees or less). Seems to be interior heat related but I am not sure. I have not checked anything out yet. It cuts off and I cannot resume or set. Wait a while and then it will come on, sometimes for an instant, sometimes for a few minutes. Turning it off via the on/off switch seems to make it start working again sooner. It's usually out for 3-5 min. I've tried turning the heat off, which worked for a while, but does not work always now. Any thoughts appreciated.
#30
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I have this problem but it only disengages when it's cold outside (40 degrees or less). Seems to be interior heat related but I am not sure. I have not checked anything out yet. It cuts off and I cannot resume or set. Wait a while and then it will come on, sometimes for an instant, sometimes for a few minutes. Turning it off via the on/off switch seems to make it start working again sooner. It's usually out for 3-5 min. I've tried turning the heat off, which worked for a while, but does not work always now. Any thoughts appreciated.