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 issueSubject: 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 theshop(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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