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Brake Fluid Flush, W124
I am planning to flush the brake fluid in my W124.128. Now, on my American cars with ABS, I first suck out the old brake fluid in the reservoir, refill with fresh and then proceed with my MityVac to bleed the brake cylinders until fresh fluid come out, always being careful to keep the master brake cylinder reservoir full.
This method has worked well and I have not bothered with flushing the ABS unit.
On my MB, I am wondering if this same procedure will be satisfactory or if I need to flush the ABS unit too?
I see in the service manual where there is a drain port (marked “SP”) on the ABS pressure unit where I assume I can pull a vacuum and drain the old fluid out, while keeping the main reservoir on the master brake cylinder full. At least I think this is what “SP” is for.
So my question is if it is acceptable to only drain the old brake fluid from the caliper cylinders and ignore the ABS pressure unit?
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