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Brake Bleeder Wrench Sizes

 
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slantvaliant
Turbo EFI


Joined: 18 Feb 2003
Posts: 2428
Location: Lubbock, Texas

Post subject: Brake Bleeder Wrench Sizes (Mon Oct 02, 2017 8:27 am) Reply with quote

The bleeder on my right rear 9-by-skinny drum is not 1/4", like the one on the left. It's 7mm.

7mm?

7mm.

No. I didn't try 9/32".

Is this common? Are wheel cylinders still available with SAE-sized bleeders?

This really isn't much of a problem. I speak metric well enough and have SAE and metric tools. I just prefer that this car require only SAE tools for routine maintenance, and as much other maintenance as possible. It simplifies logistics.

Mostly, I just hate the extra up/down transitions situations like this require. It's hard on the body!

Background: The brakes have been a non-problem for quite a while. I vaguely recall replacing that wheel cylinder, probably when I upgraded the fronts to disks. Maybe once since then. I probably bled it then without really thinking about the size.

During the recent engine swap, I noticed that the aluminum master cylinder was leaking. Installation of a new master cylinder led to flushing/bleeding the brakes all around.

I gathered the tools I expected to use before getting down to business. I had 1/4", 5/16", and 3/8" wrenches with me. I even tried different 1/4" wrenches, to no avail. I didn't expect a metric size. I did expect the same size right and left.

Tools aside, everything went well during the process. The fluid flushed out only had a little color to it and wasn't milky. The pedal feels firm now. The car isn't running, so I haven't tried the brakes on the street yet.



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"When you find a big kettle of crazy, it's best not to stir it." - Pointy-haired Boss

1964 Valiant V200, 225/Pushbutton 904
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makapipi
TBI Slant 6


Joined: 16 Aug 2003
Posts: 100
Location: honolulu, hawaii

Post subject: 7mm screw (Mon Oct 02, 2017 8:44 am) Reply with quote

mine had a 7mm screw too, i removed it and installed a 1/4 screw.
also i check the mount screw and line fitting threads for right size and depth.


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SpaceFrank
Turbo Slant 6


Joined: 30 Dec 2005
Posts: 580
Location: Houston, TX

Post subject: (Mon Oct 02, 2017 1:46 pm) Reply with quote

Yeah, I've seen new replacement wheel cylinders and calipers for various SAE cars show up with metric bleeder screws. I've got no data to correlate to different manufacturer brands, unfortunately.



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emsvitil
Supercharged


Joined: 12 May 2005
Posts: 5796
Location: So California

Post subject: (Mon Oct 02, 2017 4:58 pm) Reply with quote

Does it have metric threads?

What's even worse are screws that are SAE and metric.

Either metric head with SAE threads or vice-versa.



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Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes
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Greg Ondayko
Supercharged


Joined: 27 Nov 2004
Posts: 4525
Location: IRWIN PA

Post subject: (Mon Oct 02, 2017 5:11 pm) Reply with quote

Many time the avail. Offshore replacements are like this.. if originals are not broken sheared, stuck or cloged, and the threads are the same i try to reuse them on the replacement cylinders.


My 2 cents.

Greg



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DusterIdiot
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Joined: 29 Oct 2002
Posts: 10087
Location: Salem, OR

Post subject: Yep... (Mon Oct 02, 2017 5:28 pm) Reply with quote

Quote:
Yeah, I've seen new replacement wheel cylinders and calipers for various SAE cars show up with metric bleeder screws.


The RockAuto Raybestos brand rear brake cylinders I got for the Aspen were like that... I had to grab the closest X/32" wrench and make it work...

Not good...


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emsvitil
Supercharged


Joined: 12 May 2005
Posts: 5796
Location: So California

Post subject: (Mon Oct 02, 2017 5:59 pm) Reply with quote

I always break them loose (and final tightening)with the tightest 6pt socket


I also wrap Teflon tape around the threads so they won't rust weld.



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Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes
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slantvaliant
Turbo EFI


Joined: 18 Feb 2003
Posts: 2428
Location: Lubbock, Texas

Post subject: (Mon Oct 02, 2017 7:14 pm) Reply with quote

emsvitil wrote:
Does it have metric threads?

What's even worse are screws that are SAE and metric.

Either metric head with SAE threads or vice-versa.



I didn't remove the bleeder, just loosened it to bleed the line.

Mixed-standard systems can cause serious problems.



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"When you find a big kettle of crazy, it's best not to stir it." - Pointy-haired Boss

1964 Valiant V200, 225/Pushbutton 904
BBS, CAI, HEI, LBP, AC, AM/FM/USB, EIEIO
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rich006
TBI Slant 6


Joined: 23 Sep 2013
Posts: 149
Location: Annapolis, Maryland

Post subject: (Tue Oct 03, 2017 12:06 pm) Reply with quote

My new Dorman wheel cylinders also had 7mm hex heads on the bleeder screws. I wanted to reuse my OEM screws but the threads were a different size.


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