Re: IML: 66 Drum brake issue
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Re: IML: 66 Drum brake issue



Aren't proportioning valves used on cars with disc brakes in the front, and drums in the rear? I don't think a '66 Imperial had one, unless we are talking about a converted brake system here. Then all bets are off.

Paul W.


-----Original Message-----
From: Klebert L. Hall <crocuta@xxxxxxxxxxx>
To: mailing-list@xxxxxxxxxxxxxxxx
Sent: Tue, 27 Nov 2007 4:40 am
Subject: Re: IML: 66 Drum brake issue


Subject: RE: IML:66 Drum Brake Issue 
From: "Hall, Marc F" <marc.f.hall@xxxxxxxxxx> 
 
Hi all, 
 
I have a braking problem with my '66. 
 
The car's brakes were tired but ok before turning her over to the
shop 
(SA). Among other jobs, SA rebuilt the brakes and found the rear 
brakes lock up well before the front brakes engage fully. Lines 
have been 
flushed and seem fine. Front brake drums and shoes match ok, some 
re-arching of the shoes did not solve the problem. Front shoes are 
of a different mfg than the rear, is this a friction coefficient 
issus?? SA indicates that they are getting to the end of their 
expertise on the 
cause of the brake differential. SA is pretty good at general repairs 
and Chryslers are not too mysterious for them. I have done the brakes 
myself at least twice without screwing it up, so the pro's have hit a 
hitch in their getalong? 
 
  Proportioning valve problem(maybe some crud got stuck in there)? 
 
  There's probably a rubber line in the back - if it's gotten weak, it might be 'inflated' by line pressure, so it's keeping the rear brakes partially actuated all the time, and they grab first. This happened on my '67 Polara. 
 
  -Kle. 
  '69 Crown 4DHT (in temporary repose) 
 
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