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Brake seizure problem
I am looking for a solution to a problem that my 1963 220SEb Vin# 111.023 120 39550 has developed. This 111 model has front disc brakes and a non-tandem master brake cylinder. Even though my factory Mercedes maintenance servicer manual covers 1959-67 models, it discribes only tandem master cylinders and not non-tandem. Apparently my master cylinder's internal design does not require a special check valve to relieve pressure on the front disc but does have a primary check valve to trap fluid going to the rear drum brakes. This design is quite different when compared to the illustrated later tandem master cylinder, which includes a "special" check valve on the line to the front disc brakes, which releases pressure on the discs once the brake application is removed. I recently had the Master Cylinder and the remote ATE50/26 Power brake accumulator/slave rebuilt. Now I am experiencing occasional brake lock up! The only clues that I can provide is that once the brakes lock up: 1. I can free them by opening a bleed valve on the boost accumulator slave cylinder. 2. While it is locked up, if I unscrew the hydraulic line going from the master to the booster, fluid slowly dribbles out, but if I unscrew the line from the booster returning to the master cylinder it spurts out under pressure. On the surface I would assume that my problem is not with the rebuilt master cylinder but somewhere in the rebuilt booster or slave cylinder that is maintaining pressure in that booster to master return line. If that is the case, where in the booster/slave is my problem? Does anyone have any thoughts?
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