Thread: Low Power brake booster vacum

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Originally Posted by DennyW
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And yes, they should redo their thinking. I don't want 10 lbs fighting my rear shoe springs creating a brake drag.[/FONT]

Denny is right. Master Power Brake has it wrong. If you've ever changed your brake shoes, you know how strong those brake return springs are!! 10 psi in the wheel cylinder isn't going to move those springs!! You should also notice that the brake shoes are always pulled solidly against the round pin at the top of the backing plate. There is never a gap here when you have your foot off the prake pedal. Even if there was enough brake line pressure to hold the shoes off this pin, how would the brake system be "smart enough" to know how much gap there should be, and yet not cause the brakes to drag? Master Power Brake has it WRONG!!

Jim, That's a beautiful engine compartment, and you've shown us some really good pictures! Since you have a Corvette style m/c, did you plumb the front brakes to the m/c port toward the front of the car? Did you notice that the front reservoir in the m/c is larger than the rear? The larger reservoir is always for the front brakes, because disc brakes draw fluid from the reservoir as the pads wear. Drum brakes don't need such a large reservoir because the wheel cylinders always return to the same position, regardless of the wear on the brake shoes. There is a balance spring inside the m/c that compensates for the front/rear brake line pressure, and if you have the brake lines reversed, you won't have any rear brakes.

I don't even have power brakes on my truck, and it stops fine. A bigger power booster won't solve your problem!!