Front Caliper Piston Seized

So in the process of changing my front brakes due to pulsing and the previous owner obviously never servicing them I came to realize one of the pistons is seized on the driver side front.

Called parts stores they ask me if it’s 12mm or 14mm mounting hole. Any idea what they are talking about here? VIN was of no use to them. This is a 2016 4Runner limited.

What I am thinking of doing, order a caliper from Amazon $100 and rebuilt the one that’s on the 4Runner since it’s OEM. Local guys are selling $250+ including my core unit for god knows what brand...

Thoughts on this and specifically the 12mm vs 14mm mounting ordeal? Also, are rebuilt kits for these readily available? In Canada if it matters.

 

I’d go with a new OE, you should be able to find one for about $200

 

Well certainly not here around me in the land of Canada.

 

So based on my research - I should have the 14mm calipers, but oddly enough that corresponds to a 21mm hex head - however to remove my calipers my bolts utilized a 19mm hex head… every I read it says they switched from 12mm at 2015.. my 4Runner is a 2016 so it’s supposed to have the 14mm caliper, I guess?

So now I’m confused what’s actually going on.

 

just my $.02, buy OEM. I made the mistake of getting an autozone caliper for my 2011 and it crapped out 6 mos later. Replaced it with same version and it lasted 1 yr. Save yourself the headaches and go OEM

 

Is there a website that I can find part #s for these vehicles? I go to http://japan-parts.eu/toyota/us/# but can go over the model year 2014..

 

have you tried BAM wholesale?

 

Whag is this link? It’s all aestericks

 

Its not copying right for some reason

 

Pic

 

Are you trying to buy a brand new caliper? Or a rebuilt with a core charge? I've gone the rebuilt route a couple times before with my old BJ74 Land Cruiser and also my parents FJ Cruiser. Both times they were genuine Toyota calipers that had been rebuilt.

 

It's the size of the mounting bolts. Ask your local parts store to bring one of each into their store and compare to yours. Is the stuck one an OEM part? Even the ones from Toyota have the problem of freezing up. We've gone through plenty before we decided they aren't worth the inflated cost.

 

Yes it’s a OEM caliper, only one of the 4 pistons is seized. The local calipers are all $250+ (including my core) so even more if I keep my caliper. and they’re not remans - so Chinese premium.

my train if thought is get the Amazon unit, $100, buy a rebuild kit $20. Refurb my OEM unit and then swap it back. This way it cost me $120 and I have a OEM unit back on the rig?

I’m just not sure what rebuilt kit to get and where I can find a new piston?

 

Had this issue on my 4th gen a few years back. I put a rebuilt one on from AZ and it’s been good ever since.

 

If you're going to rebuild your OE caliper, at least get OE Toyota parts to rebuild it with. The cheap rebuild kits are an invitation for another rebuild in pretty short order.

 

I would if I could find a website that actually shows OEM part numbers. See my issue a few posts up, the website I have only goes to 2014 year model - and it seems the caliper actually changed in 2015 so would be good to see what the part # should be for the OEM kit for my year machine.

 

Try here

https://www.toyotapartsdeal.com/

 

It's going to depend on your manufacture date, a you can see. But good prices here, I've used them for a long time.

 

Much appreciate the link! Looks like based on my VIN front left caliper is 4775060350

Which comes back at $300 Canadian.

it’s funny even that caliper bolt listed there shows that it’s for productions up to 2015 for a M12 head, lol. Only thing I can think of is that my body diameter is 14mm but the head is smaller - not even sure if this is possible?

 

Who knows, maybe the last guy that did the brakes used some aftermarket bolt

 

If you are dead set on using aftermarket, check rockauto.com. usually you can find a 5% off coupon out there too, which isn't much, but it's something. I am not sure if they operate in Canada. I have used the Power stop brakes in my FJ Cruiser and was very happy, if you are looking for an aftermarket option. But there are a million out there. The nice thing n Rock Auto is they break up the results into the "good" "better" "best" type system, so you can see all your options from your specific application

 

2016 mid-year is when Toyota switched.
17mm head -> M12. 19mm head -> M14.
The other M14 bolts on your truck (like UCA pivot and lower shock bolt) have 19mm heads. Easy enough to verify. You can also easily drill out the holes on a 2010-2015 caliper from 12mm to 14mm. Commonly available 9/16" drill bit would work. Castings are the same, just the holes are drilled to different sizes at the factory.

I'm running Powerstop and Raybestos calipers on my 4Runner and Tacoma. They've been good. Get this and call it a day:
https://www.rockauto.com/en/moreinfo.php?pk=13342177&cc=3437058&pt=1704

Rock Auto ships to Canada and collects HST. No surprises with customs and brokerage.

 

It’s not a 17mm head for sure. It was a 19mm hex socket that was used to remove the bolts, which corresponds to a M12.

 

^Toyota bolts don't follow ISO sizing. M14 Toyota bolts have 19mm heads.

 

Really?? And here I am chasing a goose. Well that’s good to know! This sorts everything then ‍♂️

 

^Make sure you have the appropriate tools to loosen an M14 bolt with loctite (propane torch, impact wrench with at least 1000 ft-lb...)

 

I just did my brakes and rotors this week. I too have the 19mm bolts, but I believe they used to be 17mm not 12mm. The 12mm could be referring to the bracket above the calipers that you need to remove so they can be moved around. That 12mm bolt can also be used to break the rotors free from the hub via the holes in the rotor.

 

Oh they were broken loose man. I stick to eggs and oats in the morning

think their ft-lbs is 137ft-lbs

 

Those bolts sucked. I bought a 3/4" steel pipe and put it over my breaker bar to get the added leverage.

 

^Yes because they were installed with loctite at the factory, so it takes a lot more than 137 ft-lbs to break them loose.