I drove over to my brothers home for Thanksgiving yesterday. About 2 miles from his house, when applying the brakes, whoa! the pedal went way down. Brakes worked, pumped pedal & it came up. Checked at his place, fluid was OK. Drove home, on freeway!, no stops & driving slower than traffic, no braking necessary. (late afternoon, very little traffic). Got home & noticed no brake lites either. Woke up at 09:00 this morning, have not looked at anything yet. I am thinking master cylinder, this one was installed about 12 years ago. What does one cost these days? Is rebuilding a viable option?

-corne-

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"I applaud your elaborate system of denial"

Yes bad MC. Replace it if the brake fluid hasn't been flushed regularly. Rebuild? Eh, maybe if you know what you're doing on them. Compare the cost first.

Good luck!!!

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"Rudeness is a weak man's imitation of strength" - Eric Hoffer

I used to rebuild old Vee Dub & old Porsche MC's, simple. vw drum & Porsche disk had one different (??) in rebuild kit.

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"I applaud your elaborate system of denial"

could be a be a leaking brake pressure sender.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

Replaced calipers, one was bad, replaced both.

Replaced master cylinder, system acts just like before the M-cylinder was replaced. (see 1st post). Maybe the old (cast iron! new one is chinee aluminium, no core charge) M-C is still good??

Brake pressure sender?? where's that?

-c-

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"I applaud your elaborate system of denial"

I thought MB used an electric switch for brakes?

In 3rd pic, I happen to have a set of those 'cans'! Got 'em in 1967.

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"I applaud your elaborate system of denial"

the electric switch only activates the brake lights. I suspect a insufficient bleeding.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.