Re: Re: 1974 Dodge D600 Brakes

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Posted by Bob on October 16, 2004 at 11:07:26 from (66.163.134.177):

In Reply to: Re: 1974 Dodge D600 Brakes posted by MG on October 16, 2004 at 07:52:38:

About the muffler/filter thingy... The booster runs on engine manifold vacuum. When vacuum is applied to one side of the diaphragm to "boost" the brakes, air is admitted to the other side. When you release the pedal, the process reverses, and the air is drawn out of the booster, into the engine. The filter keeps this air used by the booster, and ultimately fed to the engine, clean.

Be sure the filter is clean and all hoses used on the vacuum side are rated for such use. I have seen people use heater hose, and it will collapse under vacuum, and cause a "hard" pedal.

For the booster to work properly, you need to have the brakes adjusted so that the pedal firms up on the first application of the brakes, and no "pumping" of the brake pedal is needed to get the brakes to apply. If they are set too loose, or worn out, the piston in the booster is moved farther with each "pump" of the brake pedal, untill the booster runs out of piston travel, and then the brake pedal will be "hard".

If the brakes have been "bled" thoroughly of air, and the adjusters can not be set up any more, to firm up the pedal on the first stroke, adjuster repairs, lining replacement, and possibly drum replacement are needed to get things back in spec., so the booster can do it's job.

It probably won't be cheap, but driving with faulty brakes may turn out not to be cheap, either!

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Re: Re: Re: 1974 Dodge D600 Brakes MG 17:43:25 10/18/04 (0)

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