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Old 06-15-2019, 09:53 AM   #1
kharrisma10
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Default Dragging Passenger Caliper?

Hi Forum Folke!

A friend and I are working together on his 2007Saturn Vue 2.2L; he's not so computer-literate, so I'm handing this end of it for him. He's already rebuilt the caliper once, then replaced it altogether when that didn't solve the issue. The caliper still drags (and eventually will lock up completely if he persists in driving anyway.)

I've searched this (and other) forums for his problem, but everything I've been able to scare up has been strictly both calipers dragging; on his car, it's only the passenger caliper that drags. As with the other posts with this issue, the rotor heats up within a few miles and is far too hot to touch without getting burned. No sign at all of this problem with the driver's side caliper.

I've seen multiple references to the wheel (flexible) hose deteriorating/failing internally and behaving like a check valve, trapping pressure at the caliper so the piston/pad can't retract that thousandth or so to clear the rotor. He should be putting in that hose today, and I'll post feedback if that clears up his problem.

He's wondering about some of the other components in the system, though. There are check valve(s?) in the brake lines up near (or in?) the master cylinder, and there's a proportioning valve to balance the application of pressure to the front calipers and the rear drums so they all apply at the same time (I gather there's some delay in the rear drums applying due to inherent design differences, linkages, etc.) In every case, though, any component he/we can come up with would affect both calipers equally; the only part I can see that would affect only the one wheel would be the flexible hose, or possibly the rigid steel tubing picked up a dent bad enough to restrict the fluid flow on the retract side of the cycle (pedal pressure overcomes the restriction easily, but is adequate to interfere with fluid return from the 'rebound' of the caliper seals which cause the piston to retract that tiny little bit.)

I should probably mention that we're both professional mechanics of some decades' experience... but that experience is in heavy construction equipment and electric forklifts; much is directly applicable to cars, but much is not. They're entirely different critters. Just mentioning this so you have an idea of the level of experience we're bringing to this problem. Mechanics? Yes. Auto mechanics? Welll…. no, not so much.

So at this point, I'm just fishing around for any ideas other than what we've come up with that we might look into... multiple heads are better than one, even when one of those heads is mine!

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Old 06-15-2019, 12:07 PM   #2
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Default Re: Dragging Passenger Caliper?

Change the hose and see what happens. The brake hoses on the Vues are notorious for getting restricted like that. One way to tell is to crack loose the bleeder screw and see if the brake fluid shoots out quickly, if it does probably the hose is restricted.

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Old 06-15-2019, 02:02 PM   #3
waiter21
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2003 VUE 2.2L
Default Re: Dragging Passenger Caliper?

Change all four hoses, If one is bad, the others aren't far behind..

...
2003 Vue - 2.2L with Manual Trans. (Swapped)
Originally had 2.2L and Auto trans.

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Old 06-15-2019, 04:42 PM   #4
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Default Re: Dragging Passenger Caliper?

kharrisma10, read this thread; http://www.saturnfans.com/forums/sho...d.php?t=193692. The front brake flex hoses are most likely strangling fluid flow, acting as a check valve. The brake hose bracket rusts and strangles the hose (see pics in the link). Replace both front hoses or spread the rusted bracket clamps.

Saturn Vues do not use brake check valves anywhere.

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Old 06-16-2019, 09:22 AM   #5
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Default Re: Dragging Passenger Caliper?

You could drive it again until the caliper starts sticking. Then crack open the bleeder screw and see if that frees it up. If so, it's probably the hose.

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Old 06-29-2019, 06:50 PM   #6
conemark
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Default Re: Dragging Passenger Caliper?

Another vote for the flexible hoses being the culprit. I took the approach of "if one's bad, do 'em all".

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Old 06-30-2019, 01:44 PM   #7
Vue6
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Default Re: Dragging Passenger Caliper?

...If you plan on keeping the vehicle til it dies, I would recommend Russell steel braided brake lines , they give you a much better solid pedal /brake feel , just my .02, DC

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