Master cylinder seals?

[ralt12]

If you're going to replace the master, replace the flexible rubber hoses as well. What may look great on the outside can shock you on the inside. Cheap insurance.

[Rafe Hollister]

Hmmm, I could try to install a master cylinder from my old pile of motorcycle brake parts, and then cancel my eBay order. Yes, that's what I shall do! CASO forever!
Rafe

[Dwight FitzSimons]

I sure hope I don't lose my CASO status?
Rafe

Be aware that you've just been put on notice. One more infraction and you will be put on probation.
-Dwight

[Rafe Hollister]

Normally my CASO self would have disassembled the MC, cleaned it, massaged the seals, reinstalled it. If that didn't work I would have just bought minimal parts. But I love this car so I splurged on a 39.00 Dorman MC from eBay. I sure hope I don't loose my CASO status?
Thanks for advice,
Rafe

[bensherb]

If you can get a new master for $40 , great! But lately I've found stuff that was $20 to $40 last year, or even a couple months ago, is now $60 to $80. A coupe weeks ago, a master that was $23 when I bid the job three weeks earlier cost me $58.

For my Hawk I got new generic rubber piston cups at Napa for a buck each that did the job, but if your master bore is anything but absolutely smooth don't bother, they won't last long.

[Ross]

They fit MANY different cars and other machines. Rockauto will offer you several different brands.

[skyway]

I seem to remember that these MC’s had/have an industrial (TowMotor?) application; lucky us!

[Dwight FitzSimons]

ebay. I bought one off ebay some time ago for my 64 Hawk and it was 40-some dollars.
-Dwight

[Rafe Hollister]

Thanks for info. 40 bucks for master cylinder? Where do I call/order?
Yest Stude1964 and DwianG, gentle pedal pressure and it goes to floor. Hard pressure and it works OK.
Rafe

[stude1964]

Ross has a point. The MC is readily available as is the rebuilding kit.
Rob in PA.

[Ross]

New masters for that car can be had for forty-odd dollars. Hardly worth further discussion about rebuilding.

[Dwain G.]

I believe you are correct; the master cylinder needs an overhaul or replacement. This is a typical symptom of worn seals when you press the pedal for a normal stop and it just keeps going down. The reaction is to release and stomp the pedal which helpsthe seals expand out a bit and seal. Test this by applying the brakes and then holding pressure on pedal. It will slowly sink to the floor.

[StudeRich]

The "Other" possibility is; you have NO Pedal "Free Travel" or a missing Pedal Pullback Spring.

[stude1964]

You might want to bleed and check that there is no air in there. Does it go to floor with minimal pressure in park? Could be air or need for a kit.
Rob in PA.

[doofus]

My experience has been when a M/C "Bypasses" like this it is rust pitted. a rebuild will help but a new one is much better. shop around and find a good deal then pull the old one and take it apart and look for your self. Luck Doofus