Throwing in the towel... my brakes have defeated me

[porschenut]

Originally Posted by T77911S

when i saw that you did that in your other post i did not think that was a good idea.
i have always blead the MC on the car. actually never heard of doing it on the bench.
i just crack the lines at the MC to bleed it, then do it at the wheels. another thing, and i think you may have done this, is to wait a week or so then bleed them again.
what type of fluid are you using? DOT?

ATE Gold and Super Blue after making sure I have a good pedal. I don't waste that stuff while bleeding the first time through. But as I said, I do not bleed the MC and I haven't had a problem. There are past threads on the subject and a lot of discussion. Some feel it's worthwhile, others don't.

[porsche930dude]

Originally Posted by Ronnie's.930

But would your pedal sink to the floorboard like the OP's does?

yes it did. thats why I replaced the m/c but had the same results. It was very strange. You could actually see the pads squishing. My brother has been a mechanic for 15 years and has never seen it before

[MConn]

Someone here on the PP forum (Walker?)has talked about a trick with rebuilt calipers - that you take out the new pads and put in old pads, or something that will allow the caliper piston to extend out, then bleed the calipers, then install the new pads.

Mike

[chrisbruck]

Originally Posted by MConn

Someone here on the PP forum (Walker?)has talked about a trick with rebuilt calipers - that you take out the new pads and put in old pads, or something that will allow the caliper piston to extend out, then bleed the calipers, then install the new pads.

Mike

Yup did that on mine and did notice a difference (even with my crappy MC).

[Charles Freeborn]

Sounds like you may have a dud MC. It happens. They can leak internally. Pelican will make it right.
-C

[Mr9146]

Recently I have encountered two brand new ATE master cylinders that were bad right out of the box. Both presented with the exact same symptoms as yours; no amount of bleeding would correct it. Swapped them out with another new ATE replacement and the problem was solved.

There seems to have been a run of bad masters out of the ATE factory.