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> Removing brake calipers?!?!?
advman89
post Oct 9 2019, 02:59 PM
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I'm trying to get the 19mm bolts that hold the calipers on...and they won't budge.
Are they reverse threads?

I've been soaking them in Penetrating oil for a week...I've tried heat...

Any suggestions?
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burton73
post Oct 9 2019, 03:14 PM
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Not sure but look on PMB Performance web site. They have suggestions on how to rebuild calipers. This is one of the problems.

I had bolts stuck and changed from one penetrating oil to PB Blaster. Taped it with a hammer a little more PB and let it sit overnight and it worked just as I was going to give up on it


Bob B



Bob B
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mepstein
post Oct 9 2019, 03:19 PM
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Normal threads. The bigger bolt just means more surface area for corrosion to happen. All the normal methods - Cheater bar, hit wrench with hammer, hit bolt to "shock" it. More heat and apply paraffin on threads while till hot - paraffin will wick along the treads and lubricate them where penetrating oil will evaporate when metal is hot.
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bdstone914
post Oct 9 2019, 05:42 PM
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Front or rear or both? You should be able to get to the fronts with an impact. For The rear upper bolt I have a favorite BMW ring wrench. It get it positioned and hit it with a hammer to break it loose. Lots of fun. No room to work in there. I good Six point box end or socket works best.
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BENBRO02
post Oct 9 2019, 09:18 PM
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Sometimes people get confused because they are not facing the head of the bolt and are actually tightening it. Double check to make sure you're turning the right direction.
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porschetub
post Oct 9 2019, 11:19 PM
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More heat and again and again,then spray hot bolts with cold water or penetrant,good luck.
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advman89
post Oct 10 2019, 07:36 AM
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None of them have broken loose (but primarily working on the rears. There's not enough room to get a socket in there (at least any sockets I own).

Gave it another soaking last night, I'll giver another wackin' tonight.

Thanks for the insights.
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ClayPerrine
post Oct 10 2019, 10:01 AM
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The caliper mounting bolts are NOT reverse (left hand) threads. I suggest getting a long box end wrench and a heavy hammer. Put the box end of the wrench on the bolt, and whack the other end of it in the correct direction with the hammer. Normally, a few blows like that will free up the bolts. Make sure you hold the box end over the bolt head as you hit the wrench. That will keep the wrench from slipping off and tearing up the bolt head.


Good Luck!
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mepstein
post Oct 10 2019, 11:47 AM
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Us east coasters are used to dealing with stuck fasteners. I have a pair of $10 welding gloves that I use when I’m working corroded parts. They go a long way to protecting my hands.
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advman89
post Oct 10 2019, 12:07 PM
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I'm kinda wishing for a fuel fire right now on this damn thing.

That might free it up.

...us midwesterners are also familiar with rust belt issues. Too bad I don't have any AeroKroil left over!
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rhodyguy
post Oct 10 2019, 12:23 PM
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Get some.
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Jonathan Livesay
post Oct 10 2019, 12:30 PM
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Impact wrench.
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914Toy
post Oct 10 2019, 01:16 PM
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if you are using a wrench and hammer, try placing a car jack stand under the wheel hub.
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porschetub
post Oct 10 2019, 01:56 PM
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I custom built a 18mm spanner for my Brembo calipers,cut one end off ,bent it and welded a piece of heavy wall pipe for leverage as I like caliper bolts to be tight.
This spanner can be used @ the top or bottom bolts without getting in the way.
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rudedude
post Oct 10 2019, 04:36 PM
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Need a good 6 point box end wrench, i.e. snap on,mac, Not so sure others have good 6 point box wrenches
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IronHillRestorations
post Oct 10 2019, 05:24 PM
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Seafoam "Deep Creep". It's the best penetrating fluid. I'll 2nd the 6 point box end wrench and a hammer, counterclockwise fo sho
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Chi-town
post Oct 10 2019, 05:44 PM
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1/2 impact, just let it hammer the bolt for a few seconds at a time. It'll either break them loose or it'll break them off.
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advman89
post Oct 10 2019, 06:11 PM
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I can get an impact on the fronts...rears are another story.
Car is on QuickJacks right now.

Mine are 19mm. Not 18.

And yea, I've got a 19mm flare nut wrench...and some crows foot rachet heads.

Counter would be towards the front of the car (confirming my (real) dyslexia isn't screwing me).

Thanks again!
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ClayPerrine
post Oct 10 2019, 08:55 PM
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Don't use the flare nut wrench. It's not made for that. Use a long box end wrench.
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Krieger
post Oct 10 2019, 10:31 PM
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Attached Image

This is how I have done that same exact thing.
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