Re: power brake booster, etc.

[ortfamily@xxxxxxx]

There is a possibility that the residual pressure held in a drum brake master cylinder can cause a slight application of the brakes when no braking is wanted. It will stop, but maybe not fully release.

On December 21, 2004 Mark Price wrote:

> My dad used a master and booster from a late 60's drum brake Ambassador on a 67 Ford 1/2 ton pickup cause he was tired of standing on the brake pedal to get it to stop.
> He had to redrill the brake pedal itself after mounting the booster. He must have guessed right on the ratio, cause I know he sure was happy with it when he finished it and drove it.
> Another case of a Rambler part fixing a Ford!
> Mark Price
> 
> ---------- Original Message ----------------------------------
> From: ortfamily@xxxxxxx
> Reply-To: mail-From-mprice-westco.net@xxxxxxxxxxxx
> Date:  Mon, 20 Dec 2004 21:30:51 -0500
> 
> >Whatever you do, you need a master cylinder for disc/drum if you are running a disc/drum setup. Drum brake master cylinders hold residual pressure to overcome the springs in the drum brakes, and discs do not. A disc master cylinder on drum brakes will not stop the car even if you push the pedal with both feet (I tried it). A drum master cylinder on disc brakes will keep the brakes slightly applied, due to the residual pressure valve in the master cylinder. I have mixed boosters and cylinders with great luck, providing they are the correct disc/drum master cylinder. I would order a master cylinder for the year/model of booster you have and adjust the push rod to have a very small amount of slack when the brakes are not applied. I have even elongated the holes for mounting the master cylinder and used grade 8 washers to reinforce the holes. You can find all sorts of boosters, cylinders, and combo units on Rockauto.com. Happy motoring and stopping.
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