calipers sticking

[CoyneJ]

I got my driver side front and passenger side rear caliper sticking, what could it be?

[Davdraco1]

Slide pin could be siezed.

[b6Hate4]

Let me shake the mystical Audizine magic 8 ball and figure this out...


Kidding. No one can really diagnose this over the internet. Pull the caliper, if it has never been rebuilt/ replaced you're very likely overdue. Slidepins could be sized but not likely, you'll know immediately once you pull the brakes off though.

[Murph_129]

I've made the mistake of buying remanned oem calipers from Autozone as I was in a pinch on money and time. Well they lasted about a month before the piston boot came loose, allowing the piston to be exposed to the elements. This caused some nasty corrosion and seized the caliper.

I've since then bought new with no problems so far 👍

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[kjames1270]

Where did you buy them new? I just installed a reman caliper on the rear passenger from autozone. But it is a oem Lucas just cleaned up.

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[Davdraco1]

I've used remand from advanced/napa and alike for years and no issues on any of my car.

[CoyneJ]

I already put new calipers on the rear with in 7k miles and the one on the front driver side is a newer one

[kjames1270]

Could be bad boots? Shouldn't be happening after 7k

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[Murph_129]

I've used remand from advanced/napa and alike for years and no issues on any of my car.

I would say you have been lucky to say the least.

I replaced the driver front twice, and the passenger front once. Both had the exact same failure of the piston boot coming loose and allowing the piston to corrode, preventing it from withdrawing into the caliper.

OP, I would do as others said, and take the quick 10 minutes to pop the caliper off. Once the car is jacked up and the wheel is off.. If the car isn't in gear, you SHOULD be able to spin the rotor by hand pretty easily. If not, you should check the slide pins and then the piston.

[CoyneJ]

My front driver side is the only one giving me issues now, when I brake normally it's fine but when I brake hard it sticks and needs to be pryed back to stop draghing, could it be collapsed brake line?

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[Davdraco1]

My front driver side is the only one giving me issues now, when I brake normally it's fine but when I brake hard it sticks and needs to be pryed back to stop draghing, could it be collapsed brake line?

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Nope. A calapsed line would mean you have no brakes at all. Most likely piston boot, I know I said slider pin but I was probably half awake then. If you do get reman's, paint them or they will have surface rust after the first rain storm. Trust me.

[Murph_129]

Nope. A calapsed line would mean you have no brakes at all. Most likely piston boot, I know I said slider pin but I was probably half awake then. If you do get reman's, paint them or they will have surface rust after the first rain storm. Trust me.

Agreed. OP, I would get the ones I just purchased. I was wrong they ARE remanned, but done properly. (And coated with weather resistant coating)... They were on sale when I got them, but the look to be a bit more expensive now. But they come with mounting brackets, slide pins, anti rattle clips, and crush washers for the fluid line.

A-1 CARDONE 19P1816 {#8E0615123A} Reman. CARDONE Ultra Premium Caliper w/Bracket & Installation Hardware Exclusive Weatherproof Coating
A-1 CARDONE 19P1817 {#8E0615124A} Reman. CARDONE Ultra Premium Caliper w/Bracket & Installation Hardware Exclusive Weatherproof Coating

http://www.rockauto.com/en/catalog/a...b,caliper,1704

[CoyneJ]

Nope. A calapsed line would mean you have no brakes at all. Most likely piston boot, I know I said slider pin but I was probably half awake then. If you do get reman's, paint them or they will have surface rust after the first rain storm. Trust me.

A collapsed line would allow fluid to go to caliper but would not allow fluid to move back and make the caliper stick

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[Murph_129]

A collapsed line would allow fluid to go to caliper but would not allow fluid to move back and make the caliper stick

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Just pull the caliper off. You should be able to find the issue real quick. :)

//Actually pulling it apart should give you much more information than us speculating over the internet.

[CoyneJ]

Just pull the caliper off. You should be able to find the issue real quick. :)

//Actually pulling it apart should give you much more information than us speculating over the internet.

I already pulled it off and everything looked ok

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[Murph_129]

I already pulled it off and everything looked ok

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Inspect the piston boot a little closer. Mine separated only slightly from its seat in the caliper. I pulled it the rest of the way back to discover the whole piston was covered in corrosion. If that's fine, then how does it feel? While it's detached, did you pump up the brakes (verify it engages the caliper fine), and then push it back in with a C clamp (make sure it goes back in with some ease).. This would rule out the piston and could possibly indicate pins.

Also, the brake line is only a hose from the caliper to the wheel well I believe. From there it is all hard line.. So it shouldn't be hard to find a collapsed line.

[CoyneJ]

Inspect the piston boot a little closer. Mine separated only slightly from its seat in the caliper. I pulled it the rest of the way back to discover the whole piston was covered in corrosion. If that's fine, then how does it feel? While it's detached, did you pump up the brakes (verify it engages the caliper fine), and then push it back in with a C clamp (make sure it goes back in with some ease).. This would rule out the piston and could possibly indicate pins.

Also, the brake line is only a hose from the caliper to the wheel well I believe. From there it is all hard line.. So it shouldn't be hard to find a collapsed line.

The problem is you cant see the line being collapsed since it has rubber on the outside

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[Murph_129]

The problem is you cant see the line being collapsed since it has rubber on the outside

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Then like I said. Do further testing to rule other possibilities out.

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[Davdraco1]

I've never heard of a brake line collapsing. They are nylon and rubber.

[walky_talky20]

The caliper piston dust boot can also be damaged by careless or improper service techniques. For example when changing the pads, if the technician is using an incorrect tool to compress the piston (like winding it in with pliers), the boot can be ripped or punctured. This will lead to rust forming on the piston surface and will cause the caliper to stick on (drag). Or, if the caliper is removed and let to set on top of the rotor or suspension components, the dust boot can be torn. This technician-induced failure mode of the caliper is actually quite common.

On the Audi rear calipers, sticking is commonly caused by the emergency brake mechanism where the pivot seal fails and causes corrosion in the mechanism. This causes the caliper to stick on (drag).

[CoyneJ]

So when I took a look at my rear brake that was dragging the parking brake wasn't fully retracted so I detached it and have no problems since and even my front caliper stopped getting sized after heavy breaking

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[Murph_129]

So when I took a look at my rear brake that was dragging the parking brake wasn't fully retracted so I detached it and have no problems since and even my front caliper stopped getting sized after heavy breaking

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Hmm. Maybe Walkey can explain but that's odd that the front stopped seizing. Sorry I missed the part about a rear caliper sticking! First thing I would have recommended was the parking break sticking. Mine did the exact same thing. No fun having to beat the lever with a wrench to release it, in a parking lot, in below freezing weather lol.

[walky_talky20]

Disconnecting (or never pulling) the handbrake lever will avoid the sticking due to corrosion/debris in the caliper's e-brake lever mechanism. A decent temporary solution so long as you aren't required to park on hills, etc.

Not sure about the front caliper. Certainly possible that pads wore down further and the piston is now extended past the rusty section. You will find out real quick-like when you try to compress the caliper to install new pads.

[CoyneJ]

Disconnecting (or never pulling) the handbrake lever will avoid the sticking due to corrosion/debris in the caliper's e-brake lever mechanism. A decent temporary solution so long as you aren't required to park on hills, etc.

Not sure about the front caliper. Certainly possible that pads wore down further and the piston is now extended past the rusty section. You will find out real quick-like when you try to compress the caliper to install new pads.

I already installed new brakes last month and the parking brake fixed my front sticking

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