Brake bleed screw size?

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MrNick
Posts: 3
Joined: Tue May 17, 2022 7:48 pm

Brake bleed screw size?

Post by MrNick »

Anybody know what thread pitch and length the brake bleed screws are for front and rear calipers?

Or happen to know of an interchangeable part I could grab locally? Seems like a dumb part to special order, not to mention the cost. Surely there's a cheaper option from another car that works?
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Robert Bondi
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Joined: Sun Jan 11, 2009 12:33 am
Location: Austin, TX

Re: Brake bleed screw size?

Post by Robert Bondi »

Threads are M7-1.0mm. I have two lengths in my stash. Total lengths are 25 mm and 38 mm.
Robert
77 530i
77 Euro 528
dutch
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Re: Brake bleed screw size?

Post by dutch »

Is there no dealership in your area? those were also used on e28 , 24 ,23 and some more.
MrNick
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Joined: Tue May 17, 2022 7:48 pm

Re: Brake bleed screw size?

Post by MrNick »

Closest dealership is a 5 hour drive one-way unfortunately.

I wasn't sure if they were the same as those used on E28/E24/E23, some sites listed the fronts as a different part number due to the 4 piston calipers.
MrNick
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Joined: Tue May 17, 2022 7:48 pm

Re: Brake bleed screw size?

Post by MrNick »

For future reference if anyone searches and this comes up:

Dorman #13905 Brake Bleeder Screw
M7-1.0 X 34mm

It will work for front and rear. Differences are wrench size is 8mm instead of 7mm and the nipple seems a bit larger.
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Mike W.
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Location: Sonoma County

Re: Brake bleed screw size?

Post by Mike W. »

I strongly suspect the size, taper and thread pitch are the same, but length may be different. If you're really a 5 hour drive, try to figure out what length it is and PM me, I may have something in my absurd stash of stuff.
Mike W.



1980 528i, 3.5 euro, 5 speed conversion
1981 528i, 3.6, Recaros and more. Project
1998 328is, quick and efficient, but not satisfying
2000 528iit, Vacation mobile/wife's grocery getter
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