Master Cylinder Bench Bleeding Question


helpme

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Can you just mount it up on the booster and use the foot pedal to do the bleeding for you? Then connect up the lines and do the wheels. Just an idea. Thanks.
 


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You absolutely can... but is it still called bench bleeding?
 

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I bench tested my spare starters while they were layng flat on the ground ;)
 

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When it spun up the way it's supposed to I said "that is a successful bench test"
 

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Another question. Can you do the front of the master cylinder separately from the back? Or do you have to bleed them together at one time?
I think the proportional valve is down on the frame rail.
 

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You do them at the same time... because there is no other choice.
 

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Thanks. I'll have to look for my other hose.
 

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If you just fill both sides with the lines started and let them gravity bleed for a bit until you get a steady drip out of each side. Then have someone give the pedal one slow steady push to the floor and hold it. Tighten the lines... let the pedal up. Loosen the lines... push the pedal to the floor again and hold it... tighten the lines up. That should remove any air in the master. If you see it pushing air out on the second push... repeat until you see no air. You may not even have to bleed the system... all depends on how the pedal feels. Don't forget that rear brake adjustment has a huge affect on pedal height.

I have replaced many master cylinders without having to bleed the brakes at the wheels...
 

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Thanks. That seems like it would work. But I'll be doing it alone.
 

ericbphoto

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Thanks. That seems like it would work. But I'll be doing it alone.
I cut a piece of wood to a length that would fit between the depressed brake pedal and the seat cushion. Push the pedal and stick the wood in place to hold it. Go out and crack open the fitting. Close the fitting. Get back in the cab and repeat.
 

Josh B

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they used to make a pedal holding rod, just a long shiny rod with a sliding handle. You'd push the pedal down with the rod on one hand and pull the handle up tight to the seat with the other hand and that would lock the pedal in place.

Might even be easy enough to make one with a maybe 3ft 1/4" or so rod and a rigid piece of metal about 1" x 3" or 4". Drill a 1/4" hole one end of the handle and slip it onto the rod. Tape each end so the handle doesn't get lost. Might have to play with the angle it leans to
 

ericbphoto

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Yeah. I thought this was easier.

20191010_212829.jpg
 

Josh B

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Cool Eric, that should work too. The other one tho you can use for the brake or the gas, also makes a decent back scratcher :D
 


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