Check your master cylinder. Look through or in the reservoir. If the
fluid is dark and dirty, your master cylinder seals are degrading. This
is the only way I know to loose pedal pressure and not be leaking fluid
somewhere.
The seals don't seal, allowing the fluid to pass by, picking up the
black rubber particles and feeding them back to the reservoir.
I believe rebuilt master cylinders are available and not too expensive.
Be careful who you buy it from. Some stores have a lifetime warranty,
but the brand new ones leaked immediately and never worked.
Cold doesn't matter to brake fluid/parts. You may have had the seals
stick due to sitting too long and they tore.
Carl
On 8/14/2015 11:17 PM, klinkelis@yahoo.com [diesel_mercedes] wrote:
>
> I have a 1980 240 D with a manual transmission. The car sits most of
> the winter, and the Pennsylvania winter was very cold. After driving
> the car in the country for a while, say longer than thirty minutes
> the Brake petal just goes away, No petal. I changed the rear Caliphers
> and lines with a used set of caliphers. It worked fine for a few days
> and then it came back. After stopping, with out hitting anything. :-)
> The petal slowly comes back and the brakes are nice and hard. I do
> not think it is a vacuum problem, because the petal goes to the
> floor. I have not been able to find any rebuild kits. thanks for any
> help bob k.
>
>
Posted by: diyernh <diyernh@comcast.net>
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