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Old 04-23-2020, 02:56 PM #1
154RTP20 154RTP20 is offline
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Seized Front Caliper Piston

I have a '15 Trail Premium with about 90k miles. This morning I started the process of replacing my front brake pads and rotors. At first, it took about an hour just to get the seized caliper pins removed. Once they were out, I was able to remove the caliper from the hub and remove the pads and rotor. Once the old pads and rotor were off, I tightened the new rotor into place and started pressing down on the caliper pistons with the old brake pads.

Here is where the problem started...

I was able to push three of the four pistons in until they were fully recessed. I noticed the fourth piston was not budging whatsoever. I had opened the reservoir and tried to pump the brakes and pushed in again. Nothing. All I have for tools to help with pushing the pistons in are some c-clamps, and even those won't help with the last piston.

Here is my question... Should I shell out the money and get two new OEM pistons and fully replace the old ones, or should I bring it in to have a mechanic look at them and hopefully fix them? I try to do all of my maintenance, and I haven't trusted some mechanics in the past but that is subjective to certain shops.

If any of you recommend I buy new calipers, which ones would you recommend and what is the actual process of replacing them? I'm familiar with bleeding brakes, but not sure if there is extra work to be done on the brake lines when replacing calipers.

Thank you guys, I look forward to your advice.

Bobby
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Old 04-24-2020, 09:24 PM #2
Dillusion Dillusion is offline
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Not worth the time to see if it can be fixed. If they are that stuck to the point which it sounds I'd get new ones.

I'd go OEM but just me.

If you can bleed you can replace the calipers. Sounds like you can handle you are already changing your own brakes.
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Old 04-27-2020, 03:02 AM #3
Devtruck Devtruck is offline
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Are the new seals oem? I'm understanding you cant get the 4th one in and not that u cant get the 4th 1 out. Old oem dimensions on piston should be the same

Last edited by Devtruck; 04-27-2020 at 03:05 AM.
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Old 04-27-2020, 09:25 AM #4
Captsolo Captsolo is offline
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Been there, done that!

Calipers on both front brakes need to be replaced at 90,000 miles is a good idea IMO. Trying to fix or rebuild them yourself is a losing effort. Buy AM rebuilts from someone reliable ok. I don't think anyone sells new calipers - except maybe the dealers.

A good brake shop with lots of lifts and a few expert mechanics is what you want.

Last edited by Captsolo; 04-27-2020 at 09:30 AM.
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