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Old 06-18-2013, 01:37 AM
Doktor Bert's Avatar
Doktor Bert Doktor Bert is offline
Das Sturm Uberdoktor
Join Date: Jan 2005
Location: Palm Springs, CA.
Posts: 2,670
Herr Doktor's Brake Advice:

Die Bremsen auf meinem W116 machten mich wütend!

We all know that we need to change our brake fluids, but I learned something recently on the old W116 that you might find of interest.

Since I changed my M/C when I replaced the front calipers, there was no problem with stroking the M/C the full length of its travel. I bled initially with a vacuum pump and finished up with a helper.

However, I then discovered that the dual piston (inboard & outboard) caliper is fed from the same side (INBOARD) as the bleeder screw is on!!!!

This means you NEVER flush the fluid out of the OUTBOARD chamber of the caliper.

Armed with 2 screwdrivers, I opened the bleeder and forced the outboard piston all the way in and was rewarded with the most murky trash I have ever seen in a system. Repeatedly, I would pump up the brakes and force the pistons back with the bleeders open until the fluid ran clear.

Not all Benz will have this type of caliper, but beware of those that do and bleed the outboard chambers, Front & Rear!!!!!


P.S. Yes, even a pressure bleeder will not evacuate the outboard chamber. You must force that piston back by hand with the bleeder open to purge it.
Did you just pass my 740 at 200 kmh in a 300SD?????

1978 300SD 'Phil' - 1,315,853 Miles And Counting - 1, 317,885 as of 12/27/2012 - 1,333,000 as of 05/10/2013, 1,337,850 as of July 15, 2013, 1,339,000 as of August 13, 2013

100,000 miles since June 2005 Overhaul - Sold January 25th, 2014 After 1,344,246 Miles & 20 Years of Ownership

Last edited by Doktor Bert; 06-18-2013 at 03:01 AM.
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