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  #1  
Old 06-30-2010, 02:32 PM
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Location: Cordova,TN
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Red face Brake bleeding w/ ABS?

Ok, now the car goes great, but alas, my brakes are messed. 85 300sd. Originally had ABS, someone took out computer and apparently one relay. Brakes worked fine for a while. Replaced wheel bearing Sat. night. Took off caliper and replaced (hung from coathanger). Left front caliper then started sticking/dragging. Heated up the rotor on drive home. Researched and replaced rubber hose, thinking inside was restricted. Now cannot get brakes to bleed. Bled a little at ABS servo, but nothing at caliper. Car is immobile (again)..need suggestions.
THX
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  #2  
Old 06-30-2010, 04:53 PM
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brake bleeding with abs is the same as regular brakes as long as the abs control unit hasnt been touched. the only time you need to worry about it is when you are dealing electronically controlled brakes such as the SBC system of mercedes and lates vehicles such as GM using it and others. its always good to refer to the service manual before proceding.
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1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)
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  #3  
Old 06-30-2010, 05:04 PM
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Whenever I bleed the brakes on my TDI I re-bleed the ABS controller so I'm sure its not full of old fluid. The old Bosch ABS on our benzes has no extra bleeding procedure however, so doing a normal brake bleed gets all the fluid.

-Jason
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1991 350SDL. 230,000 miles (new motor @ 150,000).

2013 Fiat 500E. 20,000 miles, 80 miles at a time.
2012 Passat TDI. 95,000 miles. More space, power, and fuel economy than the Benz
2004 Touareg V10 TDI. 150,000 miles. One of 450.
1999 Jetta TDI. 310,000 miles.
1992 Jetta ECOdiesel. 156,000 miles. 1 of 48. Sold.
1991 Jetta ECOdiesel. 430,000 miles. 1 of 700. Sold to VeeDubTDI, totaled in front of our house
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  #4  
Old 06-30-2010, 05:07 PM
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Quote:
Originally Posted by compu_85 View Post
Whenever I bleed the brakes on my TDI I re-bleed the ABS controller so I'm sure its not full of old fluid. The old Bosch ABS on our benzes has no extra bleeding procedure however, so doing a normal brake bleed gets all the fluid.

-Jason
true except the for models with ASR which have a slighly different procedure.
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1986 300SDL, 211K,Dealership serviced its whole life
1991 190E 2.6(120k)
1983 300D(300k)
1977 300D(211k)
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  #5  
Old 06-30-2010, 05:08 PM
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Waiting for his Model 3..
 
Join Date: May 2008
Location: Springfield VA
Posts: 5,174
Yes, but no olde diesel benz has ASR. If they have traction control it's ASD, which has its own hydro. circuit.

-J
__________________
1991 350SDL. 230,000 miles (new motor @ 150,000).

2013 Fiat 500E. 20,000 miles, 80 miles at a time.
2012 Passat TDI. 95,000 miles. More space, power, and fuel economy than the Benz
2004 Touareg V10 TDI. 150,000 miles. One of 450.
1999 Jetta TDI. 310,000 miles.
1992 Jetta ECOdiesel. 156,000 miles. 1 of 48. Sold.
1991 Jetta ECOdiesel. 430,000 miles. 1 of 700. Sold to VeeDubTDI, totaled in front of our house
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  #6  
Old 07-01-2010, 02:49 PM
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Location: Cordova,TN
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update

OK, I think I found culprit. If I am seeing correctly, the ABS unit on the fender well has basically two components, upper and lower. Upper is for front, and lower is for rear brakes? If this holds, the line coming in the front top is the supply from the master and the two out the upper rear are to the front wheel calipers. By loosening the front upper, I do get pressure bleed. The back two, however are basically dribbling..ie no pressure passes thru. If this is a correct assumption, then I believe that my ABS unit is seized or bad?? Still no bleed pressure at either front wheel. Any experiences out there?
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  #7  
Old 11-20-2011, 09:49 AM
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Location: Lafayette Indiana
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I own this car now and decided the abs was making it impossible to bleed the brakes properly and was causing the left front to drag. I bypased the ABS unit with brake lines and it seems to be working now. In the process we managed to bung up the lf caliper so I had to spring for a rebuilt unit on that wheel.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual. It still needs upholstery redone...I also have a 427 Cobra replica with an aluminum chassis.
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