1964 Chevy Malibu Master Cylinder

Tiny
64 MALIBU
  • MEMBER
  • 1964 CHEVROLET MALIBU
  • V8
  • 2WD
  • AUTOMATIC
  • 62,000 MILES
Replaced a leaking master cylinder. Prepared to bleed
the system. Pedal is very spongy and there is no
pressure and no fluid comes out of the bleeder when'the pedal is pumped 3 times then held.
When the cover is removed from the master and the pedal is pumped there is visable flow in the master.
could this be a bad rubber seal on the cover not allowing pressure to build up in the master? LOST
Do you
have the same problem?
Yes
No
Saturday, March 15th, 2008 AT 2:24 PM

3 Replies

Tiny
MERLIN2021
  • EXPERT
You can bleed it. Bench bleed the master by getting brass plugs and screw them into the two ports, then pump the master until you cant move the piston any more. Attach the lines, Have an aide press and hold the pedal crack the lines and retighten, repeat this till all air is removed at the lines, Don't let the master run dry, bleed rear cylinders by opening the bleeders and wait until the fluid dripps out. Close bleeders. Make sure the rears are properly adjusted, then test the pedal hieght
Your only symtom that I can tell is not bench bleeding correctly, or there are more leaks.
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Saturday, March 15th, 2008 AT 2:27 PM
Tiny
MERLIN2021
  • EXPERT
Answer to PM: Could I have gotten a bad one? All air is out.
Pssibly, don't forget, there is only remanufacture stuff on the market, so if it sat on the shelf a while anything is likley. Do you see any tubulence when the pedal is released? If yes thats good if no, the comensating port is blocked, What kind of pressure at the inlet does it have?
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Saturday, March 15th, 2008 AT 2:42 PM
Tiny
MERLIN2021
  • EXPERT
Another PM answer:Yes there is turbulence. Good, then if you put your finger tightly on the outlet, does it have good pressure? If you will listen to me put a good brass plug into the hole(s), snug them up, and just pump that master if it is good, it will get to the point when all air is out, that the piston WILL NOT MOVE! If this does not happen, it's Junk!Yes there is turbulence.
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Saturday, March 15th, 2008 AT 2:51 PM

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