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I need help figuring out what is wrong with my truck please help me. I have a 2010 Chevy Equinox all of my brakes are locking up. I’ve change the abs, master cylinder and the brake booster . I don’t know what else to do or change it will come to a complete stop when it’s messing up I cant drive it at all.
Sounds like the dump valves are not opening to allow brake fluid to release the brakes. Controlled by the ABS module, try disconnecting the ABS module and test the system w/o it being connected. The vehicle should still have normal brake functions, start off just forward and back to be sure that the brakes are working to stop you. Gradually increase speed and test brakes. If all seems to operate normal it seems that the brake module and or ABS pump are to blame. Hope this helps.
I had a Cadillac come in on a vacation trip. The car stopped coming off of the freeway but the brakes wouldn’t release. It turned out that the customer had taken the car in to be serviced before the trip and the person who changed the fluids and top them up put power steering fluid into the master cylinder with seal swell and it damaged the entire brake system. We had to replace the master cylinder, propositioning valve, calipers, wheel cylinders and brake lines. Everything with rubber in it. That could be a possibility. Drain the fluid and make sure it’s not contaminated. Also check the brake lines. Brake lines can collapse on the inside and will let pressure through but won’t let the small amount of pressure to return. It could also be a problem with the abs system applying the brakes.
