How to remove a Lucas Girling parking brake can with broken caging bolts? 1995 F700

[RRRAVEN]

Hi Everyone-
This is my first post at the Heavy Truck Forum have been in the Heavy Equipment Forum.

I was able to score two brand new (not rebuilds) Euclid # E-6120 parking brake can assemblies on E-Bay for a very, very reasonable price. The reason I bought these is that a few weeks ago when I went to cage my right side parking brake spring there was no preload/resistance when turning the bolt out. So I tried the left can to compare as I would think if you are caging/compressing a spring you should have some tension. The left can was the same way, no resistance. So now I am thinking that sometime during the life of this truck (1995 Ford F700 dump 23,000 original miles.....I bought it with 19,000) someone must have caged the spring cans with an impact gun and broke the pin/attachment method that holds the caging bolts to their inner pistons? My parking brakes work fine but I was trying to see if the right side was causing my slight brake drag. The new cans have plenty of spring preload when turing the caging bolt in or out.

Now here is my question......how do I remove the parking brake cans from the backing plates if I cannot cage the springs? I'll end up eating the things if I back it out with that spring preload not bottled up!

Thanks in advance for all your help-
RRRAVEN

 

[Goodysnap]

Those brakes suck period. Both to work on and performance wise in every way.

Now to your question. Here's what I would do- If you have a porta-power, adapt fittings to the oil supply port on the chamber. Pump the porta-power until the chamber is released and remove it with the porta -power attached. The only safe way to do it in my opinion. You may need to bleed the air from the chamber when you pump the porta-power to get it to fully release.

Good Luck to you - Mr. Raven.

Do you have the brake adjust tool?I have one in my box collecting dust. I've loaned it out more than I've used it.

 

[RRRAVEN]

Goodysnap-
Thank you for your input. After further investigation it turns out that I made a mistake and the caging bolts are okay and I can in fact cage the springs. The first time I tried to cage them I had the truck running and with the parking brake on or off I had no resistance on the caging bolt. Then I had the truck off and I pulled the parking brake on and off a couple of times so that all of the pressure was relieved from the parking brake cans. Then when I went to cage the springs I had resistance on the caging bolts. Very few people have had anything good to say about these brakes and there are still many trucks out there operating with this Lucas Girling system. I guess when I am done working on them I will be an expert and have more character or have gone insane?!

 

[Goodysnap]

The system is way overthought. Parts are expensive. Brakes take forever to adjust. I don't think I have ever seen a set of these shoes completely wear out. Most of the time, the brakes go out of adjustment- a leak has developed at a chamber or line-and then the park brake is inop and smokes the shoes. More than likely one side or the other would have a wheel seal or an expander leaking. Up here in the rust belt, the steel supply lines for the chambers rusted through in short order along the frame and were very expensive(I'm sure long ago discontinued) from Ford. If you have any more question-fire away, Long as it's you working on it- not me.