Re: [alfa] 105 Benditalia Brake Boosters

[Michael Findlay <michael@xxxxxxxxxxxxxxxxxx>]

You are right to suspect that a failed seal in the master cylinder will 
allow fluid to enter the servo. Replacing the seals in the MC (or the 
whole MC) usually fixes the problem. To my knowledge, the servos do not 
cause much of a problem in themselves. They are usually full of loose 
rusty scale which should be cleaned out but I have not had to rebuild 
one yet. A cleanup usually restores them to working order. A giveaway 
sign of a perforated diaphragm (apart from non-operation of the unit) 
is drawback of fluid into the inlet tract. This occurs when fluid has 
got past the MC seals and then gone further through the diaphragm into 
the vacuum side of the unit. I have also noticed that the servo shaft 
is usually packed with silicon grease which aids the sealing.

Michael Findlay
1971 Alfa 1750 GTV

On 11/05/2004, at 1:02 PM, Caxambu wrote:


> Cracked open the large clamps and slightly separated the booster 
> halves, as per Dave De Rosier's advice (thanks) and found the front 
> booster full of brake fluid. Have ordered the large diaphragm rebuild 
> kit but am now unsure of the cause as some recent posts stated that a 
> failing rear seal on the MC has the same effect as a failing rear seal 
> on the booster.
>
> Can anybody clarify? Brake fluid was mysteriously disappearing from 
> the reservoir. The front booster (1969 dual-circuit, floor-mount MC) 
> was full of fluid. What do I need to do to correct this? Thanks.
>
> --Caxambu
> 1969 Spider Veloce 1750
> Seattle WA
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