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Tech Talk with Master Power Brakes

Tech Brief Follow-Up: the Booster Pin to Master Cylinder Gap

Posted by toby on Feb 15, 2014 9:53:19 AM

Those of you who read our newsletter may recall a recent article discussing the booster pin to master cylinder gap and how an incorrect gap can cause a soft pedal.  In the article, we shared a picture that prompted one of our readers to send us a note.  Here is what he had to say:

Criticizing the experts: I believe your Booster Push Rod Gap illustration is in error...are you not showing a "manual MC" with a deep recess for the push rod? It appears you are using a (Power) with a manual MC instead of a MC with a dimple plunger. True or False?

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Topics: brakes, classic car, How To Series, push rod, soft pedal, brake boosters, master cylinder

Got A Soft Pedal? Don't Forget The Booster Pin to Master Cylinder Gap

Posted by toby on Jan 28, 2014 10:24:28 AM

A common problem and a question we answer more than we can remember is “Why does my pedal feel soft?” in my power brake system. One of the most overlooked things is probably the simplest fix.

Extending out of the booster is a pin. This pin simply extends into the piston in the back of the master cylinder. Have you ever set this distance? If you answered no, not only is this something you must do, it may be the reason for your soft pedal. Have we confused you? Take a look at the picture below and see if this helps.

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Topics: booster pin, brakes, classic cars, diagnosing and fixing soft pedal, How To Series, soft pedal, master cylinder

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