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Serious brakes issue
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I have 2010 equinox,

Every so often, my brakes will not release


I will drive down the rode come to a normal stop and my brakes will not release when it is time to go.

Some times I will have to wait 20 minutes for my brakes to release.
Once the brakes release all is well.

The vehilce does have the hill stop assist system.

What could cause this issue?
Also where is the brake actuator for the hsa?

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I had this happen before and it was my calipers sticking. New calipers and pads fixed it.

Could be the antilock system as well, but I don't have any direct experience with that.

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Two other things can cause a caliper to lock, a defective rubber hose or worn slide bolts. The slide bolts for the caliper should be replaced with every pad change. They are exposed to extreme heat then cooled back down every time you brake, and this will distort even the strongest metal eventually.

The rubber hoses deteriorate from the inside but will look perfectly good on the outside. The hoses are multi-layered and the inside-most layer will eventually dissolve and separate. When it does, it can act as a one way valve.

A second failure point on the rubber brake line is the metal bracket. On GMs, the inside of the bracket where the rubber meets the metal can retain water and can rust. When it rusts, it gets smaller inside and can close it off. This causes the calipers to clamp fast under pressure, and release slow since the return flow is not under pressure.

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I wanted to update this thread

I had to replace the master cylinder and the brake booster

The brake booster was full of brake fluid
Fliud leaked from the master cylinder into the brake booster

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Thanks for the info.
Never heard of this situation.

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