Master Cyclinder Cap

[Guest bizzycoupe]

I Backed Out Of The Garage This Morning To Put The Bumbers Back On To The Car( I've Decided To Drive It, It's Not Done But I Want To Get It On The Road And Enjoy It Until I Can Get The Money To Complete It) I Hit The Brakes Nothing, I Checked The Master Cyclinder And Had No Fluid So Filled It And Put Cap Back On And Pumped Brake And The Fluid Just Pumped Out The Cap The Threads Are Worn.does Anyone Know Where I Could Get One, I Tried Napa And Ernie Bernbaum. They Didn't Have Any, Ernie Said, 1942 To 1954 Would Fit With Hole In Cap. Thanks

[JerseyHarold]

Either Raybestos or Wagner makes (made) a replacement cap for these master cylinders. I know because I bought one several years ago. Don't have the part number, unfortunately.

Check with a good local parts store (with a clerk who doesn't mind digging in the paper catalogs) and you should be okay.

[Brendan D25]

It seems strange that the threads on the mc cap would be worn, unless it was put on cross-threaded. If the MC was empty and you just added fluid, it's a good possiblity you now have air in the lines. There must be other problems with the brakes if it was empty. Is there any fluid showing on any of your backing plates?

[Normspeed]

My MC cap threads wore off too. The cap was black plastic. I had a spare MC with a metal cap so I used that one for a replacement.

[JerseyHarold]

The replacement I wrote about earlier was cast pot metal.

[Guest bizzycoupe]

I Will Try Some Other Places To Find One. I Can't Tell If It's Leaking Or Was Because It Sat All Winter And I Can't Pump The Brakes Up To See If It Is. Thanks All

[Guest bizzycoupe]

Shel, Thats What's Happining When I Push The Brake It Spurts Out Around The Cap. I Probably Do Have Other Problem But Can't See It Yet, It Does Have A Hole In The Cap

[John Mulders]

Sure sounds like another problem to me.

there should be no pressure building up in the reservoir itself.

The oil there is purely to ensure no air can be pumped in. When pressure is applied the level should drop and when released the oil will be pushed back.

John

[Guest bizzycoupe]

I Got The Spare Cap And Crawled Under The Car Today And Checked The Brake Lines, Backing Plates,and Wheel Cyclinders Found Nothing Wrong, So I Bled The Brakes, (lots Of Air In The Line) And The Fluid Looked Old, So Drained Old Fluid Out, Now Have Good Brakes.still Don't Know What Would Make It Lose Fluid?

[Niel Hoback]

I recall as a kid, the oldtimers would put a stick between the pedal and the seat to keep pressure on the brake system when they were not using the car for a long period of time. I guess the idea being the cups in the wheel cylinders will seal tighter and thus avoid leaks.

It's taken me a while, but I am not as quick to argue with oldtimers as I used to be. There is good logic there.

Just remember to take off a battery cable, or unplug the switch.

Yse, I know, now I am the old timer. HEY, you kids, get offa my lawn !

[Guest bizzycoupe]

I Use To Put A Stick To Depress My Clutch On My Tractor So It Wouldn't Stick, Thats What The Old Timers Told Me. Now That I'm Old I Wonder Are They Right, I'm Not Any Smarter With Age.