|
| I am rebuilding the master cylinder on my '74 B. The
| design is the tandem master cylinder type without the
| Pressure Differential Warning System type. A DPO had
| rebuilt it sometime in the past and made some internal
| modifications to the piston link. The modification
| consist of bending the link back in such a manner that the
| primary and secondary pistons are no longer linked except
| by whatever could graces the separating spring provides.
| I have two questions. First, does anyone have a piston
| link from an otherwise scrap brake master cylinder that
| they could part with? I really do not want to have to buy
| a new brake master cylinder for this one part.
| The second question has to do with the orientation of the
| attachment of the link to the two cylinders. The DPO had
| the link looped once around the link pin in the secondary
| piston. One of the ends of the link has an eyelet that,
| if I could straighten the link, appears that it would
| attach to the link pin in the primary piston. The drawing
| in the Haynes repair manual indicates the opposite
| orientation, i.e. the link is wrapped around the primary
| piston's link pin and is attached by some method to the
| link pin in the secondary piston. Did the DPO bodge the
| repair by putting the link in backwards, or does the
| orientation of the link to its point of attachment not
| effect the operation of the pistons? It would seem that
| if the pistons were linked by the method in which I found
| it, the pistons would be locked together in movement. The
| method shown in the Haynes manual would appear to allow at
| least semi-independent movement of the pistons, however I
| do not know if the Haynes drawing is accurate or merely
| _represents_ a method of attaching the link, i.e. YMMV.
|
| Any thoughts on this matter is appreciated.
|
| Mike McDevitt
mcdevitt@twdb.state.tx.us
|