Technical Disc brake issue

Not me obviously.
Never thought it would make a difference. It shouldn't preload under vacuum.

 

Hummmm?

 

Very strange.........

 

New one on me! I wonder if the vacuum bleeding unseated the front brake pads (or the pistons in the calipers) enough they got a little cocked when pressure was applied. Manual bleeding would tend to seat the pads before the bleeder screw was released.
Were the brakes originally vacuum bled before all the issues started? Gene

 

Switched from drum to disc then vacuum bled. Everything was fine with drums.
Same lines and rear brakes were retained.

 

If it’s crazy, but it works, it isn’t crazy.

I can’t think of a failure mode for this one though. Somehow vacuum is moving something in the system in a way that pre-loads the brakes to lock when first applied? From the other posts, it sounds like it must be pulling the plunger forward in the m/c, in a way that it can’t fully return to rest.

A friend of mine swears by vacuum bleeding. I’ve tried it, never liked it. I use a check valve and a jar.




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Master pedal travel has to be back to all the way open for fluid to dump back in if the pedal too low it won't work, add a strong return spring to be sure.

 

You know I have been turning wrench's for 50 + years and never use to have pain in the butt situations like this, But the last few years everything I seem to touch goes to hell in a hand bag ! lol Must be an old age thing. Glad everything worked out and thanks for letting me know I am not the only one saying "what the hell". Larry

 

You’d think a vacuum inside the system would be pulling everything in.

 

Glad you found the found the problem causing you a receding hair condition. Two operations you didn't perform in above comments is 1) hold your tongue right (some times to the right or left or and 2) you did not lightly tap the calipers with a hammer.

 

Hey 41rodderz, that brought back an long ago memorie of my ol man, You could always tell if he was getting mad at whatever he was trying to fix, he would tuck his tongue in his cheek and reach for the biggest hammer he could find. Thanks for that memory Ralphie

 

Too funny.
One thing you can always count on is working on old cars will keep you entertained.
Still learning every time I touch one.