I recently did a front wheel brake job on my 84 505 sedan. I removed
the calipers, honed the cylinders (even thought I know the seal and
piston are what makes the brakes function properly), lubricated
everything and installed new seals and dust covers and pads.
Everything seemed to work well.
I pressure bled the system with a bleeder that screws into the cap of
the fluid reservoir. I went through the system two times and still
have a pedal that leaves something to be desired.
A couple of potentially noteworthy details: a) before I did the fronts
I changed the proportioning valve (rear). I did not, as many and the
manual suggested, place the car on a hoist and add weights to the arm.
When I bled the rears (when I changed the valve) I went through them
two or three times. Also, b) when I changed the valve (last month) I
seemed to get a very limited flow from the rears when I opened the
bleed nipples. This was the case when I recently bled the system after
doing the fronts.
Anyhow, the last time I went through the bleeding routine without the
pressure bleeder, I had my wife work the pedals and bled the system the
old fashioned way. The pedal still feels a bit spongy and I am
beginning to think that the master cylinder may be at fault.
I was/am curious if anyone out there could provide me with a bit of
master cylinder diagnostics. I am quite sure that I bled the system
properly and I still get a lousy pedal. Any suggestions appreciated.
Thanks,
Ken
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Received on Thu Sep 8 11:27:10 2005