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Thread: Front brake caliper bleeder screw - loosen? Reply to Thread
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  Topic Review (Newest First)
02-22-2015 02:11 PM
Joe Papa Sr
Originally Posted by papajam View Post
9mm deep 6-point socket or a 9mm 6-point box wrench.
Thanks, good to know, Jim. Thanks!
02-22-2015 01:40 PM
Originally Posted by alfaparticle View Post
Here we go again with the old wives tales...
I claim no scientific background. (I admit to being an old husband but I will not say anything about my wife's age.)

I have tried all the items on that list. IME (see dislcaimer above), they all work better than nothing - except WD-40 which seemed about the same as nothing). I did not experience a big difference between the others.
02-22-2015 12:24 PM
alfaparticle Here we go again with the old wives tales
A few drops of penetrating oil each day for 2-3 days might help. (Kroil or PB Blaster or Liquid Wrench - not WD-40)
WD-40 and PB Blaster are similar in performance and way behind the others.

A study done by Machinist's Workshop magazine in their April 2007 issue looked at different penetrating oils to see which one did the best job of removing a rusted bolt by measuring the pounds of torque required to loosen the bolt once treated. If the study was scientifically accurate, it turns out a home brew works best!
Here's the summary of the test results:

Penetrating oil ..... Average load

None ...................... 516 pounds
WD-40 ................... 238 pounds
PB Blaster .............. 214 pounds
Liquid Wrench ...... 127 pounds
Kano Kroil ............. 106 pounds
ATF-Acetone mix....53 pounds
02-22-2015 11:39 AM
papajam 9mm deep 6-point socket or a 9mm 6-point box wrench.
02-22-2015 09:28 AM
Joe Papa Sr Good deal , people, thanks! So many tools for such a tiny thing. I will start with the six pt socket.......
But is it 8mm? Hate to buy wrong size and return stuff......
02-22-2015 09:22 AM
ghnl A six point socket is less likely to round over the flats. A few drops of penetrating oil each day for 2-3 days might help. (Kroil or PB Blaster or Liquid Wrench - not WD-40)

And the threads are normal right hand threads - lefty loosey.

When you're done remember there is no need to tighten the bleeder that tight. A thin smear of anti-seize on the bleeder's threads will also help the next time it needs to be loosened.
02-22-2015 09:19 AM
AlfaTango1 I thought it was a 9mm but it's been a while since I did Spider brakes. My Mercedes SL is a 9 and I usually use 12 pt offset box end wrenches for most of the bleed screws.
02-22-2015 09:02 AM
Erik I would say a 6 point socket will fit if it's thim enough to go all way down.
It's always a good idea to give the of the screw a few gemle taps with a hammer. If you're still afraid to to round the points give the screws some penetrating oil (or cola).
If you round the points anyway, find a tool that can screw out a wregged bleed nible.
(Eh, in Danish they are called male pig dick)
02-22-2015 08:31 AM
Joe Papa Sr
Front brake caliper bleeder screw - loosen?

Is it an 8mm? Will a 6 point socket fit, or can I use a 12 point box wrench? It looks like there's very little space around the screw to accomodate a socket but I am afraid a 12 point wrench may strip it. What should I use? Thanks!

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