I'm not sure how the heat factors into it, but a lockup in one wheel is usually 
a hose whose internal lining has failed and swelled.


Sent from my iPad

> On Aug 3, 2015, at 12:20 PM, Bob via Mercedes <> 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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