Boosted drums vs. Disc Brakes

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Aug 7, 2008 | 03:34 PM

#21

jlg2002

4th Gear Member

Joined: Jun 2006

Posts: 1,483

From: Fontana, California

RE: Boosted drums vs. Disc Brakes

Quote:

ORIGINAL: Starfury

Quote:

ORIGINAL: JohnnyK

Yes, but the distribution block (At least for 67+ I believe) has that pressure differential valve in case of a leak. Is it safe to run without this (Just a tee to the front lines, and the rear coming straight off the master cylinder with an adjust. prop valve) as the master will still keep some fluid to the one that doesn't blow a line? Or do you need that pressure differential valve. The master cylinder doesn't really seperate the front/rear fluid.. So i'm wondering if a line blows, will there be any braking, or will the pedal just drop to the floor with no stopping to be had. My mechanic didn't like this idea for my car..

There is no pressure differential valve. There's a pressure differential switch that turns on the brake warning light if there's a pressure difference between the two systems. Granted, it's fairly easy to notice a leak without that, seeing as the pedal is going to sink either way.

Starfury's correct. I did a lot of brake jobs on Fords in that era, and I only recall seeing a brake low pressure switchthat functions as Starfury has described. Its unlikely there's a check valve in a brake system because the fliuid has to move in both directions. A check valve would hold pressure in one direction which would either keep the brakes applied or unapplied based on orientation.