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In Reply to: Problems Bleeding Breaks After Pad Change 88-735i posted by Tighe Werntz on January 21, 2001 at 14:52:42:
Now Ive done pads before...and the procedure for getting the air out of the lines have been:
1.Refill break fluid
2.pump the breaks 10 times and hold
3. open the release valve slightly letting the air out until break fluid starts comming out. Tigheten bleeder valve.
4. Repeat as necessarry, until the break pedal is no longer mushy.
NOW,
In doing this to my 735 I noticed the following:
1. VERY LITTLE air came out of the bleeder valve.
2. Slurpy air noise was comming from another reservour under the hood (See photo)
3. The fluid comming from the other reservour was RED!
4. My breaks are still mushy!!!
Any ideas?
I own a 93 750, so my comments have limited value.
1. The "other reservoir" in your picture appears to be the hydralic reservoir for the power steering, brake booster, etc. Pumping the brake pedal with the motor off forces hydralic fluid out of the brake booster into the reservoir. If it is leaking, the seal on the cap is bad.
2. The hydralic reservoir likely takes "pentosin," a synthetic fluid. There are two types, and the type in my 750 (type 11) is green. It is possible someone filled the pentosin reservoir with standard power steering fluid, but it also is possible the other form of pentosin, which i've never seen, is red. if its power steering problem, you need to purge and refill the system, NOW.
3. I assume you are starting at the right rear (longest line) and working toward the shortest (left front).
4. If your car has ABS, the standard bleeding method you describe won't work. I'm not aware of, and can't help with, the particular way to bleed your system (the 750 uses the interaction between the asc and the abs, and I assume your 1988 doesn't have asc).
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