[Healeys] BJ8 Brakes

[WILLIAM B LAWRENCE]

You still have air in the system. Keep bleeding. The reason the bakes pump up in 2 to 3 strokes is that at that point you have compressed the air enough to transmit force to the fluid.


Bill Lawrence


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From: Healeys <healeys-bounces at autox.team.net> on behalf of Roger Grace <roggrace at telus.net>
Sent: Saturday, July 2, 2016 6:48 PM
To: Healey List
Subject: [Healeys] BJ8 Brakes

At my wits end with this problem  ...
The brakes on my BJ8 have always been hard and bit well with little pedal movement.
Changed  out the front callipers (to 4 pot) and the problems started.
After repeated bleeding on first push,  pedal went to the floor.
After 2/3 pumps the pedal came right up and held.  After about 30 secs of no pressure on pedal  goes to the floor again.
Pistons are all in contact with pads and pads with disc; all looks good at callipers.
Suspecting a faulty MC changed it out.
Primed the new MC with fluid prior to installing.
Same story after another 1.5 pints of DOT 4 fluid focusing mainly on bleeding front callipers and booster (new);  also bled rear drums.
Pedal still goes to the floor on first pump and comes up after pumping as before.
No visible leaks and inlet from reservoir shows no leaks: tapped callipers with mallet to dislodge any air pockets.
I am using the one man bleed system a with clear tube into a container and close the bleeder valve  with no visible air at nipple and full tube of fluid to container. BTW also changed clutch MC at same time and no problems with bleeding etc.
Have now run about 1.5 pints of fluid through the new MC -  perhaps am being  too impatient ?
But no evidence of any air after about 0.5 pint. Typically how much fluid is required to clear air from MC and lines ?
Now sort or suspecting the inlet to MC from reservoir but for life of me cannot see how air can get in with no visible fluid leaks,
Any ideas from the more AH experienced listers appreciated.
rg
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