Cruise control stopped working after replacing the master cylinder

1999 PONTIAC GRAND PRIX
285,921 MILES • 3.8L • V6 • 2WD • AUTOMATIC
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JR47
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Lost cruise control after replacing the brake master cylinder. Was working fine before the replacement but now doesn't work at all.
Dec 21, 2021 at 12:52 PM
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KASEKENNY
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If this was working prior to the master cylinder, then it is possible that the new master is slightly holding the brakes applied. The brake switch will disengage the cruise, so we need to suspect this is the issue.

I am attaching the info on the brake switch and other components, and you will see that they are not related to the master so the way to prove this is to test the system or just swap the old master back on.

If the cruise starts working again then you need to order another master cylinder.

I also attached the process to adjust the switch which can help if this master is more sensitive.

Please run through this info and let me know what you find with this, and we can go from there.

Thanks
Dec 22, 2021 at 8:08 AM