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Tech Talk with Master Power Brakes

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

Posted by Master Power Brakes Team on Feb 26, 2018 10:24:00 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

Picking the Proper Vacuum Hose For Your Brake System

Posted by toby on Sep 4, 2017 8:00:00 AM

Because we are gear heads, we take every chance to look under the hoods during car shows and swap meets.  One of our guys just got back from a big show and he was surprised by how a mistake he saw so many times. 

To use his words, “How could something like this be wrong on so many vehicles?”

Since we are in the brake business, we notice more things when it comes to a vehicle’s braking system than most classic car enthusiasts. Kind of like the house painter that can’t walk into a room without checking the paint line between the wall and the ceiling.

So what was it that our resident gear head noticed? About half of the vehicles he saw had a power brake booster with the wrong type of hose going from the engine vacuum source to the brake booster.

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Topics: brake systems, brakes, classic cars, How To Series, vacuum hose, Vintage Cars

Adding Horsepower?  Don’t Neglect Your Brake System

Posted by toby on Jul 30, 2015 2:51:35 PM

Make no mistake about it, most classic car enthusiasts like to go fast.  We spend countless hours in the garage figuring out ways to go faster.  Adding more horsepower guarantees you’ll impress your buddies and have a blast every time you pull away from a red light, but that extra giddy-up can cause some problems too. 

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Topics: brakes, Brakes for Classic Cars & Hot Rods, classic cars, drum brakes, rotors, Vintage Cars, Disc Brakes

Can I Use DOT 5 Brake Fluid With My New Brake Kit?

Posted by toby on Jun 24, 2015 9:31:48 AM

The owner of a 55’ Ford Sedan just sent us a note asking why we don’t recommend using DOT 5 brake fluid with our brake kits.  Chances are good some of you are asking the same question, so this post is designed to clear up confusion about the different types of brake fluid.

If you cruise over to the local auto parts store, you’ll see all kinds of brake fluids in the aisle.  DOT 3 is always the cheapest option—DOT 4 is about 50% more expensive than DOT 3 and DOT 5 is about two times more expensive than DOT 4.  Some owners mistakenly assume that the higher cost of DOT 5 equates to better performance, but this is not always the case.  In fact, sometimes the exact opposite is true.  To get a better handle on why we don’t recommend DOT 5 for our brake kits, we need to take a crash course in chemistry.

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Topics: brake fluid, brakes, classic cars, DOT 4, DOT 5.1, muscle cars, Vintage Cars, DOT 3, DOT 5

Calculating the Right Brake Pedal Ratio

Posted by toby on May 21, 2015 11:10:24 AM

Whether your vehicle has power or manual brakes, pedal ratio is important.  If you are experiencing a hard pedal you should check your pedal ratio if you have converted from the vehicle’s OE set up.  As a general rule, your pedal ratio should not exceed 6:1 for manual brakes with a 1” bore master cylinder and 4:1 for power brakes with a 1-1/8” bore master.

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Topics: brakes, classic cars, How To Series, pedal ratio, Vintage Cars, manual brake pedal ratios, power brake pedal ratios

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