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Old 08-16-2018, 07:24 AM
Dave Ross Dave Ross is offline
Join Date: Jan 2008
Location: Wakeman,Ohio
Posts: 40

Try by unhooking bottom bolt on the master cylinder and swinging it up past horizontal, then pump. Any air should move out.
Dave Ross RV4 flying RV7 building EAA tech counselor
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Old 08-16-2018, 08:09 AM
Christopher Murphy Christopher Murphy is offline
Join Date: Feb 2007
Location: colorado
Posts: 803
Default Mounted upside down

If its mounted upside down as per early design you will never get all the air out until you turn the master cylinder right side up to bleed the system.

RV-4 "Mr. Twister"
Pitts S1S "Mexican Red" sold and missed
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Old 08-18-2018, 06:23 PM
petehowell's Avatar
petehowell petehowell is offline
Join Date: Jan 2005
Location: MN
Posts: 2,206
Default Fixed! - caliper problem..........

The owner figured it out - the brake line was coming in contact with the wheel pant and forcing the caliper to retract the puck when the brakes were released - the soft pedal was not air, it was caused by needing to force the puck out a long distance to contact the disk again.

Additional info - this plane has custom pants that allow the brakes to be bled with only an access panel removed.

the brake line was repositioned, and the pedal is firm all the time now.

Amateur Plane - RV-9A N789PH - 2100+ Hrs
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St. Paul, MN

Last edited by petehowell : 08-18-2018 at 06:27 PM.
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Old 08-21-2018, 11:09 PM
lr172 lr172 is offline
Join Date: Oct 2013
Location: Schaumburg, IL
Posts: 3,568


If a soft pedal can be pumped up and becomes hard, that points to seals in the master cylinder or some anamoly with the calipar (warped rotors have similar symptoms). Air in the lines will have the pedal soft until enough pedal travel has occurred to compress all of the air and then it goes hard, often progressively. This should be repeatable any number of times with the same amount of soft travel before going hard. If it is air in the lines, you could pump a hundred times and you'll still have the same amount of travel before the pedal goes hard.

RV-6A / IO-320, Flying as of 8/2015
RV-10 in progress

Last edited by lr172 : 08-21-2018 at 11:14 PM.
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