Pressure bleeding tandem master cylinder
Posted: Thu Jun 09, 2011 1:47 pm
I have recently completed restoration of a Federal 72 Elan Sprint with dual master cylinder and no servo, standard pads. After many attempts to bleed the brake lines I find that I still have only marginal braking with long travel and significant pedal effort. The system was initially pressure bleed, then manually bleed, and finally the pedal was put under pressure over night. Still only so so preformance.
So here is the thing. It my owners manual there is a single line that says "WARNING: Under no circumstances must the tandem master cylinder be bleed under pressure." (I found this only after my pressure bleed). This statement does not appear in any of the workshop manuals I have. I have not a clue why this should be a problem, what damage it might have caused, or whether it has any significance to my poor braking. At this point I am about to go and rebuilt the master once agian and avoid the pressure bleed.
Has anyone had any experience wit problems related to pressure bleeding tandem masters?
So here is the thing. It my owners manual there is a single line that says "WARNING: Under no circumstances must the tandem master cylinder be bleed under pressure." (I found this only after my pressure bleed). This statement does not appear in any of the workshop manuals I have. I have not a clue why this should be a problem, what damage it might have caused, or whether it has any significance to my poor braking. At this point I am about to go and rebuilt the master once agian and avoid the pressure bleed.
Has anyone had any experience wit problems related to pressure bleeding tandem masters?