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E85 / E86 Z4 (2003-2008)
E85 Z4 Roadster, E86 Z4 Coupe, E85 Z4 M Roadster, and E86 Z4 M Coupe talk with our BMW gurus here.

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  #1  
Old 06-12-2009, 01:04 PM
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Z4M: Size and pitch of the brake bleeders ...

Does anyone know the pitch and length of the Z4M brake bleeder screws? I am planning to replace them with the Russell Speed Bleeders from Summit Racing ...

Thanks.

Pal
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  #2  
Old 06-12-2009, 08:04 PM
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Quote:
Originally Posted by pal View Post
Does anyone know the pitch and length of the Z4M brake bleeder screws? I am planning to replace them with the Russell Speed Bleeders from Summit Racing ...

Thanks.

Pal
M8 x 1.25
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  #3  
Old 06-13-2009, 04:37 AM
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Thanks Ron.

Any idea what length we need or does that not matter? Summit Racing has 8x1.25 in 24mm and 39mm lengths ...

TIA.

Last edited by pal; 06-13-2009 at 04:39 AM.
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  #4  
Old 06-13-2009, 06:08 AM
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Try the 24mm ones, and report back...
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  #5  
Old 06-13-2009, 07:20 AM
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Ordered the 24 mm 8x1.25 Russell Speed Bleeders. Will try them out after the next weekends' track days and report back.

Thanks guys.
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  #6  
Old 06-13-2009, 07:58 AM
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Originally Posted by pal View Post
Ordered the 24 mm 8x1.25 Russell Speed Bleeders. Will try them out after the next weekends' track days and report back.

Thanks guys.
That will work. Stock is 1/16" longer.
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  #7  
Old 06-13-2009, 08:41 AM
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That will work. Stock is 1/16" longer.
I read the chart wrong.
24mm is the overall length. 24mm = 0.98425"
Is that from end to end?

Stock end to end is 1.286"
Also 9 mm hex.

Last edited by Ron Stygar; 06-13-2009 at 06:52 PM. Reason: Changed 11 mm to 9 mm
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  #8  
Old 06-13-2009, 09:37 AM
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The overall length is 24mm per the Russell Performance website- guess that is end to end.

On the stock Z4M, I use a 9 mm 5 point box wrench to loosen/tighten.
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  #9  
Old 06-13-2009, 10:59 AM
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Quote:
Originally Posted by pal View Post
The overall length is 24mm per the Russell Performance website- guess that is end to end.

On the stock Z4M, I use a 9 mm 5 point box wrench to loosen/tighten.
They might be short. On the stock ones below the hex bottom is 0.745"

9mm is correct (6 point).
.
.

Last edited by Ron Stygar; 06-13-2009 at 11:40 AM.
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  #10  
Old 06-13-2009, 06:00 PM
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Thanks Ron. I will call Russell Performance on Monday and get some more details on the lengths.
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  #11  
Old 06-16-2009, 09:36 AM
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Quote:
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They might be short. On the stock ones below the hex bottom is 0.745"

9mm is correct (6 point).
.
.
Below the hex portion, the lengths are as below

8x1.25 24mm overall = 0.701"
8.1.25 39mm overall = 0.859"

Looks like I may have to go with the longer 39 mm one to ensure the base seats against the caliper hole when tight.

Thoughts?
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  #12  
Old 06-16-2009, 12:06 PM
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Quote:
Originally Posted by pal View Post
Below the hex portion, the lengths are as below

8x1.25 24mm overall = 0.701"
8.1.25 39mm overall = 0.859"

Looks like I may have to go with the longer 39 mm one to ensure the base seats against the caliper hole when tight.

Thoughts?
Looks like the 24 mm won't work.
I would purchase both to see.
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  #13  
Old 06-16-2009, 12:36 PM
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Looks like the 24 mm won't work.
I would purchase both to see.
I'd have to agree; I would want to use the shortest that would fit, to minimize "protrusions" from the caliper (things that an errant rock or flying piece of rubber could knock off).

Usually, when you tell the salesperson upfront that you might have to send something back, they have a good attitude about it. I'm always straight with them.
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  #14  
Old 06-16-2009, 05:25 PM
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  #15  
Old 06-17-2009, 06:57 AM
JCz04Bimmer JCz04Bimmer is offline
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Is the appeal of this item simply that you don't need to have a friend close the bleeder valve when you're done pumping the brakes? This part closes off the system from air by itself when fluid/air is not flowing out of it as a result of your pumping of the pedal?
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Old 06-17-2009, 08:00 AM
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Is the appeal of this item simply that you don't need to have a friend close the bleeder valve when you're done pumping the brakes? This part closes off the system from air by itself when fluid/air is not flowing out of it as a result of your pumping of the pedal?
It's a simple check-valve; a spring keeps a ball on the seat but fluid pressure from pushing the pedal will overcome the spring's tension.

Sounds good in theory, but I'd be suspicious about how well they would work after a year's worth of road grime gets into them. If they aren't supplied with rubber caps, make sure to use the ones off your original bleed screws.

And, did anyone notice that Daniel posted? Do any of you newbies even know who Daniel is?
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  #17  
Old 06-17-2009, 09:33 AM
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The idea behind this is also that on track you dont need to get the entire car on jack stands, have all 4 wheels off and need a second person to simply do a quick purge on the bleeders or specific bleeders.

Thanks dwm (and Randy ) for that link - Are those the bleeders you are using? Have you had any issues? Looks like a perfect fit and I may just go with those.
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  #18  
Old 06-17-2009, 08:23 PM
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The idea behind this is also that on track you dont need to get the entire car on jack stands, have all 4 wheels off and need a second person to simply do a quick purge on the bleeders or specific bleeders.

Thanks dwm (and Randy ) for that link - Are those the bleeders you are using? Have you had any issues? Looks like a perfect fit and I may just go with those.
I think those are the ones I was using on the stock calipers. There's an 'LL' version of the same bleeder that is longer. There are also brass ones instead of stainless steel. I'd measure mine for you, but they're in a box at my mom's place.

Randy is right about capping them. They come with rubber caps, but I didn't use them; I prefer high-temp vinyl caps from McMaster-Carr that cover the hex too (helps prevent brake dust from eating away at them). I don't have pictures of those caps on the stock calipers, but I used the same type on the Wilwoods I have now. Not sure if they're the same part number, I have several bags of these vinyl caps. On the Wilwoods, they're McMaster 6448K49. Visible in this picture:




Russell parts are quality parts, I have some Russell hardware on the Wilwoods. I was just throwing out another length possibility for stainless and brass.
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  #19  
Old 06-17-2009, 08:31 PM
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And yes, they're nice to have for purging 100ml or so from each caliper at the track. But they're also nice for fast bleeding and flushing in the garage.
I've never had a problem with stainless speed bleeder valves, but I've always kept them capped when I'm not bleeding the brakes.
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  #20  
Old 06-17-2009, 08:38 PM
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I think those are the ones I was using on the stock calipers.
The ones on my Z3 was M6 x 1.0 with a 7 mm hex.

Last edited by Ron Stygar; 07-27-2009 at 10:15 AM.
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  #21  
Old 06-17-2009, 08:42 PM
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And yes, they're nice to have for purging 100ml or so from each caliper at the track. But they're also nice for fast bleeding and flushing in the garage.
I've never had a problem with stainless speed bleeder valves, but I've always kept them capped when I'm not bleeding the brakes.
So you open the valve and pump the pedal and fill up the master reservoir?
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  #22  
Old 06-17-2009, 08:50 PM
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And yes, they're nice to have for purging 100ml or so from each caliper at the track. But they're also nice for fast bleeding and flushing in the garage.
I've never had a problem with stainless speed bleeder valves, but I've always kept them capped when I'm not bleeding the brakes.
Have you tried it on the clutch slave?
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  #23  
Old 06-17-2009, 09:02 PM
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Have you tried it on the clutch slave?
Z3-M clutch bleed is 6 mm x 1.0

Z4-M is 7 mm x 1.0

Both are 7 mm hex.

Last edited by Ron Stygar; 06-17-2009 at 09:05 PM.
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  #24  
Old 06-17-2009, 09:10 PM
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Quote:
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The ones on my Z3 was M7 x 1.0 with a 7 mm hex.
Yes, I was talking about the brand, not the specific size. On the Z3 they would have been the 7100SS:

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  #25  
Old 06-17-2009, 09:19 PM
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So you open the valve and pump the pedal and fill up the master reservoir?
If I'm just bleeding, yes. If I'm doing a full flush I still put the pressure bleeder on the resorvoir for the convenience of not having to check the resorvoir a bunch of times.
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