2017 Camry-Sticky Front Brake after replacement, stumped

[naimc]

Caliper service ? I did that last summer on the front calipers of our Highlander.

Use compressed air to push out the piston's ( I almost crushed a finger) watchout and use a piece of wood to limit the travel of the pistons. inspect clean, I changed the inner seals and dust boot seal. My piston's were good enough that I reused them.

Remove rust from all the parts any way you see fit, I used the soap method with electrodes in bucket and let it bubble for a day.

before and after :

soda blast just for fun

Paint and re-assemble with new seals , actually that not the proper way to put the dust seals back on.

It was more like this :

then if you are goof ball like I am test on jig to make sure it sort of works so car does not crash on 1st drive :

All done, reman brake calipers in your garage.

 

[Astro14]

Yes, I don't see how a hose could hold pressure in a brake caliper unless it was obviously kinked?
I've had reasonable luck with cheapish brake calipers? I can't remember replacing one and having problems but the cars only were around for 3-4 years after. The originals all went for 10+ years and near 150k miles, so maybe they weren't prone to have problems at all.

I've seen it happen - they fail internally - so, they let high pressure through, but they block low pressure.

Meaning - you can apply the brakes, but the low residual pressure won't be relieved with that internal restriction, so, the pistons don't retract.

The caliper appears to be sticking, but in fact, it is the hose.

 

[D60]

Caliper service ? I did that last summer on the front calipers of our Highlander.

Use compressed air to push out the piston's ( I almost crushed a finger) watchout and use a piece of wood to limit the travel of the pistons. inspect clean, I changed the inner seals and dust boot seal. My piston's were good enough that I reused them.

Remove rust from all the parts any way you see fit, I used the soap method with electrodes in bucket and let it bubble for a day.

before and after :

soda blast just for fun

Paint and re-assemble with new seals , actually that not the proper way to put the dust seals back on.

It was more like this :

then if you are goof ball like I am test on jig to make sure it sort of works so car does not crash on 1st drive :

All done, reman brake calipers in your garage.

Pfft, you didn't use an analyzer to get actual numbers?? So lame.

https://www.amazon.com/dp/B000850MZK/

JUST KIDDING! FANTASTIC WORK

 

[ctechbob]

You've probably already replaced the calipers, but it is possible to use too much grease in the sliders. They'll move freely but make the assembly grab because they cannot contract the whole way in the bore.

 

[AutoMechanic]

The brake hose would be my guess. They break down and deteriorate on the inside and don’t function properly and you’ll never be able to tell by just looking at it from the outside.

 

[brages]

I had the brake hose problem on my DILs Fusion. First I replaced the caliper, but the brake dragging came back. Lesson learned to always replace hoses whenv replacing calipers.

 

[berniedd]

Yep, brake hose ummm, HOSED ME once. A front wheel in my old VW would often lock up and get very hot after I applied the brakes. The flexible brake hose to that wheel developed an inside obstruction that functioned like a one-way valve. Prevented the pressure from going back to the master cylinder once my foot was off the brake pedal.