pjoshyjosh
Well Known Member
Well that was fun.. and educational I suppose.
While doing other wiring work I had noticed fluid on the floor under Left side pedals.
Ordered Matco rebuild kits from Aircraft Spruce and rebuilt the Cylinders (easy)
Reinstalled cylinders into airplane and purchased blake bleed kit from Harbor Freight (Vacuum system bleeding).
4 hours of bleeding and finally got the sequence that seemed to work -- ugh.
Reservoir is so small it doesn't stay full long... but here are the steps I believe finally worked:
*Fill Reservoir
*Pump Right seat right pedal 5-10 times
*Refill Reservoir
*Bleed Right side slightly cracked bleeder valve
*Pump Right seat right pedal while bleeding
*Refill Reservoir
*pump Left seat Right pedal to fill cylinder
*Continue bleeding until no bubbles or pressure holds for 3-5 seconds on bleeder vaccum gage. -- Keep Reservoir from going empty
*Close bleeder valve and check brake firmness on right pedal
*repeat until firm and repeat on left pedals
*refill reservoir
One key thing you see in this is 'fill reservoir' -- the reservoir is so small it is quick to empty when trying to refill the brake cylinders.
Now - had I purchased a pressure bleed system instead of a vacuum bleed system, I suppose I could have saved myself a lot of pumping of pedals and refilling of reservoir?? Pressure system 'fills' the system from bottom up and fills the cylinders until fluid comes out of reservoir? Perform this on both sides and brakes should be good?
While doing other wiring work I had noticed fluid on the floor under Left side pedals.
Ordered Matco rebuild kits from Aircraft Spruce and rebuilt the Cylinders (easy)
Reinstalled cylinders into airplane and purchased blake bleed kit from Harbor Freight (Vacuum system bleeding).
4 hours of bleeding and finally got the sequence that seemed to work -- ugh.
Reservoir is so small it doesn't stay full long... but here are the steps I believe finally worked:
*Fill Reservoir
*Pump Right seat right pedal 5-10 times
*Refill Reservoir
*Bleed Right side slightly cracked bleeder valve
*Pump Right seat right pedal while bleeding
*Refill Reservoir
*pump Left seat Right pedal to fill cylinder
*Continue bleeding until no bubbles or pressure holds for 3-5 seconds on bleeder vaccum gage. -- Keep Reservoir from going empty
*Close bleeder valve and check brake firmness on right pedal
*repeat until firm and repeat on left pedals
*refill reservoir
One key thing you see in this is 'fill reservoir' -- the reservoir is so small it is quick to empty when trying to refill the brake cylinders.
Now - had I purchased a pressure bleed system instead of a vacuum bleed system, I suppose I could have saved myself a lot of pumping of pedals and refilling of reservoir?? Pressure system 'fills' the system from bottom up and fills the cylinders until fluid comes out of reservoir? Perform this on both sides and brakes should be good?