Could be hoses, could be the caliper.

If you were able to troubleshoot, when the caliper is locked up then you
open the bleeder valve on the caliper, and if fluid comes out and the
caliper un-locks, that's a  pretty good indication that the hose is the
problem.

-------------
Max
Charleston SC

On Mon, Aug 3, 2015 at 12:20 PM, Bob via Mercedes <mercedes@okiebenz.com>
wrote:

> A few weeks ago I mentioned I broke down on the way to my shorehouse. Since
>  I  replaced the power booster on my 78 240D before I went ahead &  ordered
> A PB from Rockauto.con,got it in a day & a half .I contortingly  installed
> it [ Dan- easy for me being 5'-6]  Then I realized the check  valve on the
> vacuum pump was kaput.  Couldn't remove it due to the galling  between the
> steel valve & the aluminum body. So I put in a new one. I even  had to
> remove
> a broken bolt from the previous owner. Bled the brakes with my  homemade
> pressure bleeder [Boy that's fun !!]
>                  Then when I would drive it a few miles,after a few lights
> my front right  caliper would lock up & I had to abandon the car Half an
> hour later I come  back I would drive back to my house before it would get
> tight again. I  installed both front NEW calipers[Bendix] just 2 years
> ago. I
> replaced all four  brake hoses about 4 years ago.
>       My question  is does this sound like  brake hoses collapsing on the
> inside ?? I don't remember my source for these  hoses [Chinese?] My car
> brakes would be fine after it "cools"  down  after a half hour or more. I
> bled
> the brakes again still same thing.
>          I did notice that my rear  brake hoses did have some black specs
> when I bled them so I'm wondering about  the hoses.
>        HELP ! I'm now 92 miles away from my  car since I had to come home
> due to renters.  I'm 4 weeks away from My week  at the house when I could
> work on it again in my driveway. Any suggestions ?? If  I need hoses I'll
> order
> from MB. Caliper from Rockauto. THanx guys.
>
> Bob
> 1983 240D
>
> PS runs like a new car except for the eventual lockup
>
>
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