Question about 2009 Hyundai Sonata

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Does anything else can cause the passenger side brake not release except caliper and fluid hose?

I checked the new caliper before I replace the old one. I can use my finger to move it back and forward. I also think my old caliper is no problem too. By the way, I installed the new caliper and fluid hose. (Proportioning valve seem impossible, Master cylinder? I don't think so ) So What Else?????

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1 Answer

ABS System issue maybe

Still should work with the engine off

That leaves, not bleed correctly

Not master,may never get one of them in your lifetime

Posted on Nov 21, 2014

Testimonial: "But I think ABS System not design to give pressure to the brake, because the brake fluid return to reservoir when I release the brake pedal. So anything else. Thank you answer my question."

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I have a 2005 Chevy Equinox LS and the drivers side front brakes keep locking up. Can I get some help with this problem. None of the lights come on when this happens.


Most likely the brake hose to the caliper is bad. They deteriorate from the inside and clog up, not releasing the fluid. A way to check is raise that tire pump up the brakes, release the hose at the caliper, if the caliper releases, the hose is bad, if it doesn't the caliper is bad or you have no brake pads left and the piston can/is cocked a bit.

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Its probably the rubber hose that goes between the metal break line and the caliper. That hose is like a 2 way valve that lets fluid into the caliper when brakes are applied and lets fluid back out when brakes are released. These hoses deteriorate and stop letting fluid back out causing the brake to stay tight against rotor.

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89 cadi eldorado. passenger side front brakes keep going bad after a week of driving. new pads, rotor. and caliper. any thoughts?


Your problem is most likely the rubber flex hose going to the caliper. When they get old, the inner hose will soften and collapse effectively creating a check valve. When you press the brake pedal, the high pressure from the master cylinder will allow the brake fluid to travel to the caliper but when the pedal is released, the pressure from the caliper isn't enough to get past the collapse and your brake will be pressurized as if you are pressing the pedal. A quick test would be to press the brake hard and release it. Go to the wheel that has the problem and crack open the bleeder. No fluid should come out if it's normal. If fluid spurts out, change the flex hose. If one is bad, chances are the other will be not far behind so you might want to change them both.

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Brake on front passenger side continuously locks up (seizes). Have replaced the master cylinder, rotor, pads and caliper but problem persists. System was bled entirely and new brake fluid flushed througout...


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Replacing front brake brake calipers and bleeding them


jack up car and remove wheels, use a stick to depress brake pedal about an inch this will keep fluid from running out during replacement, loosen bleeder screws to relieve pressure, then ddisconnect brake hose at caliper, replace the calipers and reinstall hoses with new gaskets, remove brake hold down and bleed passenger side then drivers side.

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By "sticking" I am assuming that you mean that the brakes are staying applied (calipers are not releasing)and burning the brake pads and rotors up.

The most common cause of this is brake hoses.

The hoses that connect your calipers to the steel brake lines have an inner lining and a reinforced outer "shell". sometimes the inner lining tears loose from the outer shell inside the hose. (It cannot be seen by "looking" at the hose.) The inner lining then starts to act similar to a "heart valve" where it allows fluid to be pushed down into the caliper, then collapses inside the hose, blocking the fluid from returning to the master cylinder when the pedal is released. This can happen just because of the age of the hose, but is more commonly caused by someone allowing the caliper to hang by the hose while replacing the brake pads without using anything to support the weight of the caliper.

To diagnose this condition, raise and support the vehicle and remove the wheels. Make sure that the transmission is in "Park" (Automatic Transmission) or "Neutral" (Manual Transmission) and apply the parking brake. Then start the engine and apply the service brake. (Press HARD on the pedal) Shut the engine off, release the service brake and open the bleeder screws on the calipers. If brake fluid squirts out of the bleeder screw under pressure, then the hoses are the cause of the calipers not releasing.

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As strange as it may sound the problem is on the driver's side. That caliper is seized. If you check the pads will be almost new on that side compared to the passenger side. That caliper must be replaced and new pads installed on both sides. However, I've never had much luck changing one caliper, usually within a month or so I have to go back and do the other one. You may want to consider that option, calipers aren't that expensive. Hope this helps.

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Replace both front brake hoses.....they collapse on the inside and will not allow fluid to retract...caliper was probobly fine.....this happens a lot....good luck...Lee

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Sounds like a bad caliper. I would return it and try a new one. Theres just not much else that would cause that problem.

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