Question about brake bleeding - BMW Luxury Touring Community
 
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post #1 of 5 Old Aug 13th, 2016, 10:11 am Thread Starter
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Question about brake bleeding

My LT has the grub screw/filler adapter instead of the usual bleeder only for the right side of the front brake. For some reason they put it on just for one side and the left side as the normal bleeder screw. So I bought a SB1010 speed bleeder on ebay and was trying to bleed my brakes today. I removed the grub screw so as to screw the speed bleeder instead but the unthreaded end of the speedbleeder was too deep which prevent the thread of the speedbleeder to reach thread of the brake filler. I filled a part of the cone shape end of the speed bleeder so as I could screw it until it seated. Then I screwed the speed bleeder 1/4 turn and tried to press the brake level but that did not push any brake fluid through the bleeder. So I screwed the speedbleeder a little bit more but still no brake fluid pushed out when pressing the brake lever. I dont want to screw the bleeder too muich not to damage the thread of the brake filler. Anything I am doing wrong here?

Alain

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post #2 of 5 Old Aug 13th, 2016, 10:30 am
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Re: Question about brake bleeding

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Originally Posted by Alpac View Post
My LT has the grub screw/filler adapter instead of the usual bleeder only for the right side of the front brake. For some reason they put it on just for one side and the left side as the normal bleeder screw. So I bought a SB1010 speed bleeder on ebay and was trying to bleed my brakes today. I removed the grub screw so as to screw the speed bleeder instead but the unthreaded end of the speedbleeder was too deep which prevent the thread of the speedbleeder to reach thread of the brake filler. I filled a part of the cone shape end of the speed bleeder so as I could screw it until it seated. Then I screwed the speed bleeder 1/4 turn and tried to press the brake level but that did not push any brake fluid through the bleeder. So I screwed the speedbleeder a little bit more but still no brake fluid pushed out when pressing the brake lever. I dont want to screw the bleeder too muich not to damage the thread of the brake filler. Anything I am doing wrong here?
First of all, what year is your LT? Need to know if it is ABS-II or I-ABS.

There is a check ball in the end of the bleed attachment that has to be depressed by the conical end of the bleed screw. If you ground too much off, it may not be hitting the ball and opening the way for fluid to come through. I am not a fan of speed bleeders as too many have reported them to start leaking and could not get them to stop no matter how much they tightened them.

The BMW part ( non speed bleeder) bleed screw part number is:

34 21 2 330 310 VENT SCREW - M10 0.02 1 $12.60


There is locktite on the threads of the bleed attachment so heat will need to be applied if you want to remove that thing and not remove the caliper threads with it simply use a bleed screw in its place in the right caliper. Many do that but I still keep a spare bleed screw around so I can do the clutch as it has the same. You can use an appropriate speed bleeder with no grinding in place of the bleed attachment if you choose or just use it to open the check valve for bleeding and leave it alone as I did.

Good luck.

Gordon
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post #3 of 5 Old Aug 13th, 2016, 11:37 am
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Re: Question about brake bleeding

The part mentioned in the above post is referred to as a grub screw. Also used on the clutch bleed port on the end of the access hose for the clutch slave cylinder. It has a bit of a change of pace to use. As mentioned there is a ball check valve at the bottom of the BMW fill port that we are talking about. So to use the grub screw the technique is just the opposite of a usual bleeding sequence. Normally you loosen the nipple to bleed a little fluid then close it before sucking air back in when you release your lever. With a grub screw you need to lightly bottom it to let the tip of the grub screw push open the ball check valve and then fluid will flow. Back off the grub screw to seal the check valve before you release the lever. It takes little torque on things to do this, in face you can do it by finger if you like but wear vinyl gloves as brake fluid as other chemicals are not good to get on your skin. I also keep a spritz bottle of water and a drop of dish soap in it to de activate spilled brake fluid and help wipe any mess.

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post #4 of 5 Old Aug 13th, 2016, 12:46 pm Thread Starter
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Re: Question about brake bleeding

Thanks fo your quick response folks. I do understand the grub screw technic and the check ball that is pushed by the tip of the grub screw. I may have indeed filed the conical end of the pseed bleeder a bit too much although I did file it bit by bit until I was able to screw the bleeder thread to the brake bleed attachment. May be I got the wrong speed bleeder that has too much of non threaded conical end. My LT is a 99 non integrated brake. I wanted to use the speed bleeder just to bleed the brakes and take it out right after and not keep it permanently

Alain

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post #5 of 5 Old Aug 13th, 2016, 4:33 pm
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Re: Question about brake bleeding

Just apply heat to the filler adapter (to soften the loctite) and remove it and then just replace it with a standard bleeder screw (M10). Don't know why BMW left those on anyway.

John
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