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  #1  
Old 11-18-2019, 12:33 AM
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Proper DSC bleed procedure

Hello
Does anyone have a link they could share on how to properly bleed the air out of the DSC? My rear lines broke and drained the system and having a HELL of a time getting the air out of the system. I do have a pressure bleeder and software to activate the pump. I do get a reasonable pedal with the X not running but goes slowly down to the floor running.. Ive been using the pressure bleeder in conjunction with the computer activated bleeding sequence. Thanks all
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Old 11-18-2019, 01:26 AM
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I believe you have to activate both the boost pump and the abs block. I forget the order. I think I found in my PDF shop manual. If nobody else can find the steps online I can look it up in my PDF
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Old 11-18-2019, 03:29 PM
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PDF would be great. My scanner does provide a bleed function Just not sure on using it properly. I have bled many systems before but this one seems quite temperamental.
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Old 11-18-2019, 11:11 PM
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Proper DSC bleed procedure

Bleeding Front Or Rear-Axle Brake Circuit
  1. Connect bleeder hose with container to bleed valve on right brake caliper.

  2. Open bleed valve.

  3. Run bleeding routine with BMW Diagnosis and Information System (DIS) with bleeder valve open.

  4. After running routine, press brake pedal 5 times to stop. Clear, bubble-free brake fluid must flow out.

  5. Close bleeder valve.

  6. Repeat procedure at left caliper.



CAUTION: Use only clean brake fluid. Ensure no dirt or other foreign matter contaminates brake fluid. DO NOT mix different brands of brake fluid, as they may not be compatible. DO NOT spill brake fluid on car, as it will damage paint. If brake fluid contacts paint, immediately flush with water.

CAUTION: The 4.6is with M62S engine requires brake fluid DOT4 (low viscosity). All other models can be filled with the same brake fluid.

NOTE: Check relevant operating instructions for each device. Charging pressure

should not exceed 29 PSI (2 bar).

NOTE: Take care of rubber gasket in lid
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Last edited by andrewwynn; 11-19-2019 at 05:35 PM.
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Old 11-19-2019, 03:22 PM
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+1^

On my own application, it took three tries to get all the air out of the system after the lines were opened and the pump/master/booster were replaced. Road test and repeat one time.

Note: Master died after opening the system (who knows why)

PITA
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Old 11-19-2019, 03:57 PM
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Quote:
Originally Posted by StephenVA View Post
+1^

On my own application, it took three tries to get all the air out of the system after the lines were opened and the pump/master/booster were replaced. Road test and repeat one time.

Note: Master died after opening the system (who knows why)

PITA
My biggest fear is the master cylinder failure when bleeding. My brake pedal in both my cars has never seen more than the top 25% of travel. Once you manually bleed with the pedal, the seals in the master cylinder go deep into the previously unused 75% of the cylinder that may be a smaller diameter and could be filled with debris from years of service.

I am getting ready for a BBK on my E46 with an original master cylinder so I bought a Motiv pressure bleeding tank to try to avoid shoving the master cylinder seals into the abyss.

This should also help in the INPA ABS pump bleed without having to pump the pedal to move the fluid through once the pump runs. Fingers crossed.
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Old 11-19-2019, 09:33 PM
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Well my BIG problem comes from having a decent pedal maybe 2 inches of travel. Now when I start the beast the pedal goes to the floor with ZERO resistance and I can slowly pump it up wile running but of course drops to the floor again... Very frustrating! I for the life of me can't figure out why I would have a so so pedal with it off and totally nothing when running. Anyone been down this road?? Any direction would be greatly appreciated!! And I have replaced the master with the same results!! Sorry for the rant but I can't wrap my head around this..
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Old 11-19-2019, 09:38 PM
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You have a big bubble of air in the loop to the booster pump is my guess at some point a valve opens allowing back flow of pressurized fluid. The manual I have just directs to use the BMW software to bleed so I'm not sure if boost first or abs block first but both as accessible with foxwell and I know people on XO have done it with similar scanner. My feeling is use the pressure bleeder to bleed the rear right brake via the boost pump until no bubbles them via abs block to each corner of the car . I'll dig a little depeer


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Old 11-19-2019, 09:41 PM
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THANK YOU SO MUCH!! I just sent you a PM. I truly appreciate your direction!
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Old 11-19-2019, 09:59 PM
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i just found some helpful hints at pelican, including a photo of the BMW scanner page for bleeding brakes it's nearly identical to the foxwell.

anyhow they say to bleed normally, then use the scanner to bleed the pre-charge and abs blocks than follow up with the regular bleed; that seems to me would loose a lot of fluid having to push bubbles all the way to the rear wheels. you probably have all the bubbles out of the lines so this is what i would do:

bleed the front left wheel with the scanner tool set to purge the pre-charge pump and then the ABS block; it's the shortest path to a wheel so the least wasted fluid; i'm not sure the path of the lines, the air might come out of those right into the MC reservoir, so you wouldn't loose any fluid anyhow.

BMW scan tool shows the precharge pump first then ABS block so i would try that order. with the pressure bleeder attached, run the tool on both those first, then try to bleed the left front; if no bubbles they probably went to the reservoir and you're good-to-go; if there is no spongy feeling.

If you still have a bit of spongy (you should no longer have the 'drops to floor' syndrome, there is likely some bubble in a line, and you are supposed to go from the longest to shortest line so LR, RR, RF, LF order.

I blew out one of my rear lines stopping for a deer, but i drove home using brakes only 7 times in 3 hour drive, only had to stop once to add fluid and i never allowed air into the system so i only had to bleed the rear no ABS entrapment whoo too. I must have gotten a tiny bit in somewhere, because my brakes are ever so slightly softer than wife's x5 (we both have 01 models). maybe next time i have the scanner attached i'll run the ABS and precharge pump bleed procedures and find out the answer to the question of where does the air go.
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