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MattMcK #1504279 Thu Jun 08 2023 06:03 PM
Joined: Jul 2022
Posts: 73
MattMcK Offline OP
Not sure what the new one is, I was just told its a new one for the truck. Probably should have taken the time to pull it apart and measure i guess. Might be my next move.

59 chevy Spartan 100, former firetruck
348ci with spicer 5 speed and electric rear
MattMcK #1504707 Sun Jun 11 2023 03:07 AM
Joined: Mar 2004
Posts: 6,208
Your Master Cylinder should have a bore of 1.5".

Brake lines rubber and steel fail from the inside out, they might look good on the outside but are one push away from failing from the inside.

Did you bench bleed the Master Cylinder?

Did you bleed the Hydrovac's two bleeders first before going to the wheels following the service manual instructions (1955 book)?

Mike B smile

Mike Boteler

1956 Chevy 3100 Resto Rod []
1956 8400 Wrecker w/Holmes 525 []
1956 9200 Tractor w/Allison Automatic []
1952 Willys M38 Army Jeep
1953 Willys M38A1 Fire Jeep
1978 CJ-5 Navy Jeep
Hughesville, MD
MattMcK #1504720 Sun Jun 11 2023 11:25 AM
Joined: Jul 2022
Posts: 73
MattMcK Offline OP
Bled the hydrovac like the book says, didnt bench bleed the master tho. Just fill it up and screw the cap on then tip it so the outlet is up and pump it?

Next step might be tracking down the original master cylinder since im pretty sure I cant buy one right? And cant bore out a 1.25"? While im at that ill replace all the lines i havnt already.
Anyone happen to have modern part numbers for the rubber lines?

59 chevy Spartan 100, former firetruck
348ci with spicer 5 speed and electric rear
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