Topics

1

Originality / 1970 Brake Distribution/Pressure Differential Switch

« on: January 02, 2015, 06:28:06 PM »

I could use some help identifying a pair of original brake pressure differential switches. I've attached a pair of pictures that I hope will better explain my question.

Which of these (if either) is a 3983040 brake pressure differential switch as used on a 1970 Camaro? The only difference I can see is that the cleaner one includes a plugged fluid port in a place where the dirty one is solid. The internal parts are identical. I have two like the dirty one that I bought as advertised for a 1970 Monte Carlo (which the parts catalog seems to group with Chevelles) and a 1970 Camaro. So, what are these? What other cars were they used on?

Thanks for any insights...

2

Restoration / 1970 GM 1233464 Metering Valve Rebuild

« on: February 04, 2013, 09:57:57 PM »

I just posted an article that describes how to rebuild the 1970 GM 1233464 metering valve using a new seal kit that I produce. Here's the article:

https://www.musclecarresearch.com/gm-1233464-rebuild

Please let me know if any part of the process is unclear or could be explained better. The rebuild kit is available for $12 plus shipping per kit:

https://www.musclecarresearch.com/gm-metering-seal-kit-2

Orders can be placed directly from my web site. Just add the item to your shopping cart and click through the "Checkout" links. Payment methods accepted include PayPal, credit cards, checks, and money orders.

Please note that the kit DOES NOT include a replacement for the Bendix rubber dust cap. I'm still exploring my options to see if it can be done economically.

3

Restoration / 1970 GM 1233464 Metering Valve Disassembly

« on: December 09, 2012, 10:08:46 PM »

Thanks to a little help from someone at Brake & Equipment Warehouse in Minneapolis I finally figured out how to disassemble the 1970 1233464 metering valve. I just posted an article describing the process:

https://www.musclecarresearch.com/gm-1233464-autopsy

I'm working on a seal kit so it can be rebuilt. Does anyone know of any other cars that used this valve in addition to the Chevy and Olds applications?

4

Restoration / GM 3905525 Metering Valve Disassembly and Rebuild

« on: September 01, 2012, 07:36:58 PM »

I've just completed disassembly and rebuild articles for the GM 3905525 metering valve made by Bendix for 1967 - 1969 GM vehicles. I've also got a new seal kit available that I'll post in the classifieds. Here's the disassembly article:

https://www.musclecarresearch.com/gm-3905525-autopsy

The rebuild article:

https://www.musclecarresearch.com/gm-3905525-rebuild

I don't yet have a reproduction of the Bendix rubber dust cap. I'm exploring my options to see if it can be done economically.

5

Restoration / GM Brake Pressure Differential Switches?

« on: December 28, 2011, 10:58:21 PM »

I'm working on the parts needed to rebuild GM pressure differential switches like the one in the attached picture. I could use some help in figuring out the original applications, though. Can anyone explain the applications for these parts? Were they used on both disk/drum and drum brake cars? I've read that they were used from 1967 - 1974, is that correct?

6

Restoration / Volunteer for Brake Metering Valve Restoration Research?

« on: August 06, 2011, 12:43:36 PM »

First post!

For the last several years I've been researching the possibilities in rebuilding the different brake valves used on American muscle cars. I started with Fords because I needed to rebuild the combination valve used on my 1970 Mustang, but lately I've been looking at the valves used on AMC, GM, and Chrysler vehicles, too. I've recently had some success in producing a kit for the rear proportioning/pressure regulating valve used on 1967 - 1969 Camaros and I'm currently working on a kit for the pressure differential valve/switch. With a little help I think I can produce a kit to rebuild the metering valve, too.

I've seen some pictures of the insides of the metering valve, but I need to see one up close to measure the seals properly. Does anyone have a used original valve that they'd be willing to let me borrow for autopsy and research purposes? I'll rebuild it for free and return it to you if I can come up with the parts for a kit. It may take a few months, so I need to work with someone who's not in a hurry.  I'm keeping my eye on eBay and I'll buy one there if the price is right, but working with a volunteer may be quicker.

Thanks for your help.  I'm looking forward to learning more!