Technical Tips > Pre 84

bad brakes

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MADLT1:
I have not touched it yet been to hot lol

bfit:
The vacuum pump idea works well, as long as there are no leaking calliper seals .
 you can spend a lot of time pulling air out of the system only to find it coming through a seal.
A pressure feed system is far the better system
bfit

Vettech:
If they are the orginal seals and disks out of square, and as they sit off the disk by only a thou or two, then they will be wobled by the disk causing them to suck in air.
The replacement style are I think "O ring" type, and seal better than the square setion seals, used in conjuction with S/S sleeves, once bled are great. I had continual issues like you on a 78, once overhauled (s/s sleeves o/ring braided line) I never touched them again AND it now stopped on a dime.

Chris Jurgeit:
I had heaps of trouble with my '68's brakes.  I'd bleed them, drive for a day or so, and the peddle got longer.  I did the usual - braided lines, new master cylinder, new front calipers (they were replaced because of seal failure and fluid leakage).  Back calipers 'seemed' ok.  No leaks in system, but still the long pedal issue persisted.  In the end I bit the bullet and bought new stainless piston-seal rear calipers and pressure bled the system again.  To date (six months) my pedal is good.  When I inspected the old rear calipers I found a hairline crack in the cast iron of one of them.  This was on the inside of the caliper and couldn't be seen unless the caliper was damp, then dry.  The moisture identified the crack, much like magnafluxing I'm guessing.  While I'm not 100% certain, I think the crack was letting air into the system, but not letting fluid out.  For what it's worth....

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