Re: Synchros?

Posted by BDeB On 2012/10/5 1:28:10
Quote:

55PackardGuy wrote:
Back to nuts and bolts:

Is there a vacuum seal at the base of the pedal assembly next to the floorboard on the cursed Treadle-Vac? The rod that goes through the floorboard to the MC seems to have a massive vacuum leak around it.

It hisses and gurgles and complains and you can hear it while you drive. The brakes do work, but a whole lot of pedal pressure is needed because all the vacuum assist is evidently bleeding away at this spot.

I'm not looking for advice on why the whole braking system should be replaced-- just that one part. Can it be installed without ripping out the MC (again)?

This is probably talked about somewhere, but as I don't have a shop manual yet (YET) and the mechanic working on the car is very good at figuring almost everything out, I'd like to have this info for him before I take the car in again next week to sort out some things that haven't been sorted out yet.

The car "runs and drives" pretty darn well considering all the mechanical fits and starts it has been subjected to in the past.


There is no seal for the rod where it goes thru the floorboard and into the vacuum section of the M/C assembly, just a large felt washer.
There is a heavy rubber hose inside the vacuum booster that supplies manifold vacuum from the connection on the outside to the vacuum piston inside. If that hose is disconnected or damaged there will be a massive vacuum leak and loss of pedal boost.
Unfortunately the whole booster and master cylinder assembly would have to be removed to check this.

See Plate No.43 in the 1948-54 parts book for a cross-section view and Plate No. 13A in the 1955-56 parts book for an exploded view.
The Easamatic Power Brake section of the 1951-54 service manual has step by step instructions and photos as well. All available on this site.

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