Re: power brake booster, etc.

[ortfamily@xxxxxxx]

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.

On December 20, 2004 Armand Eshleman wrote:

> Looking for some more advice here if possible.  The master cylinder gave up
> the weekend before last. Finally after nearly 28 years in the car, 18 of
> which it
> was in storage.  Russ from Washington state got me a disc brake setup from
> a 75 Hornet. Because the master cylinder gave up I am finally going to put
> the
> disc brakes on the front of my 70 Javelin and replace the booster/master
> cylinder
> at the same time. Anybody had any good luck with cross referencing boosters
> and
> masters for these applications? Will the Hornet booster and master bolt up
> to the
> Javelin firewall? Pushrod length gonna be a problem? Russ sent me the
> proportioning
> valve so I see no problem there. Right now the plan is to leave the drums in
> back,
> but maybe later install discs in back or go to a Ford 9" with discs.
> So, in summary,
> Is the booster and master from a 75 Hornet interchangeable with a 70 Javelin
> equipped with
> power drum brakes, but going to discs? If my approach on this is wrong what
> parts do I need?
> Maybe just the master from a 75 Hornet? And get a rebuilt booster for the
> Javelin?
> 
> thanks,
> 
> Armand
> 
> 
> 
> 
> .


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