Spongy brakes *sometimes*

[JShadzi at aol.com]

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[ Picked text/plain from multipart/alternative ]
Have you bled the brakes recently?

Javad

In a message dated 7/9/2002 6:49:58 AM Pacific Daylight Time,
helgeww at start.no writes:


> I have this strange issue with my brakes:
>
> The pedal is sometimes tall and firm, just as I want it to be, but
> other times, it is lower and slightly spongy, just as if there was a
> little air in the system.
>
> The problem can come and disappear from one second to the other, but
> always between brake applications. That is, the pedal does not sink
> while I am on the brake, but if I release the brake and apply again,
> it can change.
>
> When low, the pedal goes about half way to the floor before the wheels
> lock on dry road, so there is still plenty of braking power.
>
> The amount of effort to obtain a certain brake force does not change,
> so the booster system seems OK.
>
> There is no hydraulic leak, neither brake fluid nor Pentosin.
>
> Rear calipers, discs and pads are new (calipers are remanufactured). I
> think maybe the problem started after I replaced the rear calipers,
> but I am not sure. I have replaced the rear brake lines earlier, so I
> think my bleeding technique is OK. I have tried bleeding several
> times; I must have a couple of liters through by now.
>
> The "patient" is a 1984 100. Hydraulic brake booster, discs all
> around. WC engine (2144cc, 10V). No hydraulic suspension.
>
> Is it possible the master cylinder can draw air and let it out again
> somehow ?
>