hydroboost/master cylinder issues

[jmarsh223]

I've had a leak in this area for awhile now, and today I broke down to rebuild the booster. In the process of removal of things, I found my leak is only between the master and the booster. Now for the crap part, I can not find the oring, rubber seal or whatever it maybe anywhere. Local, auto zone doesn't have oring this big. Anyone have a part number or a knowing of where I can get the ring?

[bjytech]

I'm coming up with a part number of 04723395 for the master cylinder to booster seal.

Edited July 6, 2015 by bjytech

[jmarsh223]

Thanks man! I've been looking all over since noon

[Mopar1973Man]

There is a rebuild kit for the hydrobooster from One Eye Jack's...

http://articles.mopar1973man.com/general-cummins/33-brake-system/79-brake-hydrobooster-rebuild

[jmarsh223]

I have that kit, unfortunately it doesn't have the gasket between the master and booster. Thanks for your input though I really appreciate all the help

[Mopar1973Man]

Give them a call maybe they can tell you a part number so you can order one or source it out.

[bluegoat01]

On the subject of the hydroboost. I recently did the re seal thatso on the forum. Well the PS pump seemed to be lagging so I went ahead and replaced it. Well I filled the pump and started the truck it felt fine for a second then I started getting a moaning noise the wheel shutters and the brake petal shutters when depressed. Didn't want to start a new thread for this since its related to the hydroboost

[IBMobile]

You might have air entrained in the power steering fluid. For how long did you have the shuttering for?

[bluegoat01]

It started right after I installed the new pump.I've lifted the front tires and turn the wheels lock to lock numerous times. I thought I solved it but 5 minutes down the road and the brake pedal was pulsating again and the moaning noise was back. But I have noticed that if the engine is over 1100 rpms all the symptoms stop. All the noise is coming from the hydroboost and it visibly moves when it's pulsing.