Re: IML: 66 Drum brake issue

[Ken Miller <kdmiller44@xxxxxxxxxxx>]

I have been waiting for Dick Benjamin to weigh in on this but since he 
hasn't, may I be so bold to address this question?

There aren't proportioning valves on these cars because the 
"proportioning" is done by the diameter of the wheel cylinders on the 
wheels.  The front wheel cylinders are larger than the rear wheels which 
allows more pressure to be placed on the front wheels than the rear.

Ken Miller
61 and 67 Converts
Portland, Oregon

PAUL WENTINK wrote:

> 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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