About the end of March I asked this group about the brakes on my 1970
350 cu in. 350 hp. convertible. The consensus was new callipers.
I got new back callipers and all the parking brake bits and that is
all OK, but before bleeding the rear and replacing the front, I
decided to blow out all the old fluid from the master cylinder and the
pipes. I took off the master cylinder, cleaned and re-sealed it and
assembled it with new 4 dot fluid.
I tried to blow out the pipe to the rear with the rear callipers
disconnected, but the pipe seemed blocked. The brakes were working OK
before. I tried sucking with a vacuum supply, but that did not work
either. So I filled up the master cylinder reservoirs with new fluid
and tried to pump it through. Apart from a couple of tiny bubbles
coming out, the fluid did not seem to be going into the cylinder. The
brake pedal was not building up pressure. So why is this, I have left
it for the night and maybe it needs some fluid to seep through to
allow the pumping action to take place?
Has anyone got any ideas as to why this should be. I also would like
to know what the small (broken) switch is that sits between the two
vacuum overrides for the headlights and the wiper flap, under the
steering column. Where do the vac. pipes from these two vac. taps go
to in the engine compartment? I need to trace out where I am losing
the vac to these two circuits.
Thanks for any comments; they will be most welcome, if anyone knows.