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EFV-8 Club Forum / General Ford Discussion / Bleeding brakes

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Discussion Topic: Bleeding brakes -- page: 1 2

kubes40

02-23-2020 @ 4:18 PM

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That's what I needed to know! Go get a NEW master cylinder my V8 friend.

By the way, there's really no need to bench bleed a single reservoir master - especially when power bleeding. When you have the pressure on, pump the pedal once or twice before you bleed off the wheel cylinders.

Mike "Kube" Kubarth

Dustbowl

02-23-2020 @ 5:59 PM

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Ok, I took out the master cylinder and tested on the bench. It pumps an amount of brake fluid equal to the piston displacement with a stroke equal to brake pedal movement. It creates very high pressure of outlet is blocked, and the is no "fade". Or piston slowly slipping towards end. And there s no leak

So I conclude the M C was working well in the car

That leaves only three reasons I can think of which would result in the brake pedal going to the floor without expanding brake shoes enough!
- Brakes not adjusted properly, which I don't think is the case
- Air in system, which I also doubt, or
- Expanding rubber bosses

Where else can pumped fluid be going? Any ideas?

Puzzled dustbowl, 1934 Okie

kubes40

02-24-2020 @ 5:27 AM

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If I understand you correctly, the brakes were working fine prior to swapping the master cylinder (sans the leak). So, if I am understanding correctly, the only thing that has changed is the master.
Yes?
Get a different master....

Mike "Kube" Kubarth

TomO

02-24-2020 @ 7:01 AM

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I agree with Mike. You cannot apply the same pressure to the MC piston when it is out of the car as it gets when you use the leverage of the brake pedal.

A few years ago we went through 4 Chinese MC before giving up and asking the parts house if there were any made in the US. He ordered a re-manufactured MC and that worked fine.

Make sure that you adjust the pedal to give 1/4" to 1/2" free play measured at the pedal. Any less will cause the brakes to lock up and more will cause a low pedal.

There is no need to bench bleed a MC, but I do it to make sure that the new cylinder is functional and to speed up bleeding. I do not use a pressure bleeder.

Tom

deluxe40

02-24-2020 @ 8:22 AM

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On the chance that you had two simultaneous problems, a friend just spent over a year changing brake parts (cylinders, hoses, lines, shoes, fittings) only to discover that the soft pedal was caused by his brand new Chinese brake shoes. The metal shoes to which the linings are attached are all 3/16" too short where they enter the wheel cylinders. Tough to find and not easy to measure, but a set of genuine Ford shoes fixed the problem.

This message was edited by deluxe40 on 2-24-20 @ 8:26 AM

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