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Brake proportioning valve [E4TZ-2B257-C] - NOS

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1986F150Six

Brake proportioning valve [E4TZ-2B257-C] - NOS

Administrator

https://www.ebay.com/itm/Ford-brake-proportioning-valve-New-Old-Stock-Part-E4TZ-2B257-C/153607938005?hash=item23c3bf1fd5:g:pogAAOSwctxdWIHV

LARIAT 85

Re: Brake proportioning valve [E4TZ-2B257-C] - NOS

I need that.

Does that fit a 1985 F150?

(Gary?)

Lucille: 1985 Ford F150 XLT Lariat

*Colors: Dark Canyon Red exterior, Canyon Red interior
*Engine: 5.0, CompCams 31-230-3, "Thumper" E7 heads, Edelbrock Performer intake, Autolite 4100 carburetor, DuraSpark II ignition, Thorley Tri-Y headers, Flowmaster dual exhaust, H-pipe.
*Drivetrain: AOD transmission, 3.55 gears, 2wd.

Gary Lewis

Re: Brake proportioning valve [E4TZ-2B257-C] - NOS

Administrator

Rick - No, sorry. Some E-Series vans and...

E4TZ 2B257-C
84/ F250 - - 2/W/D - Over 6900 G.V.W. and Under 8500 G.V.W.
84/ F350 - - 2/W/D - Crew Cab w/single rear wheels w/9200 G.V.W. and 4.9L, 5.8L, 6.9 dsl, engs.
84/ F350 — w/dual rear wheels

Gary, AKA "Gary fellow": Profile

Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
Blue: 2015 F150 Platinum 4x4 SuperCrew wearing Blue Jeans & sporting a 3.5L EB & Max Tow
Big Blue: 1985 F250HD 4x4: 460/ZF5/3.55's, D60 w/Ox locker & 10.25 Sterling/Trutrac, Blue Top & Borgeson, & EEC-V MAF/SEFI

Rembrant

Re: Brake proportioning valve [E4TZ-2B257-C] - NOS

In reply to this post by LARIAT 85

That one doesn't look like an OEM unit, although it could be...I removed mine and I thought it was cast iron.

It almost looks like one of the aftermarket units:

https://shop.broncograveyard.com/1976-1986-Ford-Bronco-F-Series-Truck-Aftermarket-Pro-Valve/productinfo/22519/

Edit: I was typing while Gary was answering...NM...

1994 F150 4x2 Flareside. 5.0 w/MAF, 4R70W, stock.
1984 F150 4X2 Flareside. Mild 302 w/ 5spd. Sold.
1980 F150 4X4 Flareside. 300i6 w/ 5spd. Sold in 2021.
1980 F100 4X2 Flareside. 351w/2bbl w/NP435. Sold in 1995

Gary Lewis

Re: Brake proportioning valve [E4TZ-2B257-C] - NOS

Administrator

It does look like that aftermarket unit.

Gary, AKA "Gary fellow": Profile

kramttocs

Re: Brake proportioning valve [E4TZ-2B257-C] - NOS

Administrator

I thought the same earlier but it looks like it has a two pronged switch (like my 86) whereas all of the aftermarket ones I've found in the past are single pronged.

Scott
'Camano' 1986 F250 Supercab XLT Lariat 460/C6
'Chanute' 1980 F350 C&C 400/NP 435 - Gin Pole

But there ain't nothin' wrong with the radio

PetesPonies

Re: Brake proportioning valve [E4TZ-2B257-C] - NOS

In reply to this post by 1986F150Six

Just so we all know . .that is NOT a proportioning valve. It is a combination valve. If a disc/drum setup, it MIGHT have a proportioning valve built into it, although some vehicles still had the proportioning valve mounted outside. This is a huge misnomer passed around and around, so that everyone ends up thinking it is correct. This is not a proportioning valve.

Pete's Ponies
Mustang RUSToration & Performance

1982 F100 Flareside
1983 Bronco

Gary Lewis

Re: Brake proportioning valve [E4TZ-2B257-C] - NOS

Administrator

Ford called it a "pressure differential valve", but had this to say about it in the 1980 factory shop manual:

"The pressure, differential, proportioning and metering valve are three different systems. (Figs. 4 and 5). There are three functions of the pressure differential valve: It delays full effectiveness of the front brake, it proportions pressure to the rear system, and it operates a warning system in case of malfunction. During heavy brake application, the proportioning valve reduces pressure to the rear brakes to avoid lock-up. The metering valve delays effectiveness of the front disc brake until the rear brake shoes are against the drum."

Gary, AKA "Gary fellow": Profile

PetesPonies

Re: Brake proportioning valve [E4TZ-2B257-C] - NOS

The pressure differential valve is a part of the combination valve as well. It is it's own identity. It turns on the brake light when you loose pressure in one of the braking systems, primary or secondary. The differential in pressure, allows the shuttle to slide to one side making contact with the electrical contacts, turning on the light. The combination valve is called that . . for obvious reasons :) Before there were differential valves and proportioning valves in them, there were metering valves to keep a vehicle from dipping in the front when the brakes were first applied.

Pete's Ponies
Mustang RUSToration & Performance

1982 F100 Flareside
1983 Bronco

Steve83

Re: Brake proportioning valve [E4TZ-2B257-C] - NOS

Banned User

In reply to this post by Rembrant

This was the original on my '83 Bronco:

It's still in the junkpile somewhere, and was working when I removed it.