Need seal kit for 3800 brake booster (bendix 2772114)

[t444ebusser]

anyone have part number? called bendix.. They said they sold biz, had no info. Mine is oozing at nut at connection to master cylinder housing. Figure its an o-ring. RTV might could fix but want to see if can find seals first.. Thanks!

[PorchDog]

Check with:

Automotive Brake and Clutch in San Antonio, TX.

I bought a reman HydroMax booster (maybe the same part number as yours) from them, and they sell a lot of parts too...

[t444ebusser]

They only sell the reman units. Said they buy the remans from someone else. Said they don't know where to get seals

[Jolly Roger bus 223]

a picture of where its leaking would help.
if its a line then it would be a double flare.
if its leaking where the master cylinder bolts to the booster then the master cylinder is shot internally.

[t444ebusser]

It is leaking where master cylinder bolts to booster. I can hear some air when really stomp brake pedal. I am guessing the booster needs new seals. Trying to get the part numbers. Here's a photo. The brake fluid collects on the bolt head my finger is pointing at.

[PorchDog]

https://1999southwind.com/DOWNLOAD/B...r%20Manual.pdf

[t444ebusser]

Thanks. Is this as simple as unbolting the master from booster, applying a thin bead of rtv or gasket maker and rebolting? found booster rebuild kit for $60 but now after looking at the diagrams i'm realizing the master internals could be source of leak. i have no idea without taking it apart i guess.

[Jolly Roger bus 223]

looks to me that you need the pump seal kit? that is a mounting bolt and should not have any fluid behind it.
call these guys Sweeting Performance - Bosch Hydro-Boost, Bosch Hydro-Max, Vacuum, and Air-Hydraulic Power Brake Systems.
never worked with a hydro max system but do have a hydro boost system i am getting ready to look into.

[t444ebusser]

My power steering fluid is full. No loss of fluid. My brake fluid however is slightly lower. So I am losing brake fluid. I believe that means my master reservoir is the one that is leaking. If the booster was leaking I am told I would be losing power steering fluid.

I assumed it was the booster leaking due to the faint air noise when mash brake pedal hard - I had read that was sign of problem with brake booster. Maybe booster has separate issue with air leak.

Braking performance is excellent I just want to fix this fluid leak obviously.

[t444ebusser]

Trying to determine what seal kit I need.. anybody know how to make sense of the stamping on the side of my master cylinder? I know there are different sizes but was hoping I could get info without unbolting it. Wasn’t sure if I would have to bleed it again if I unbolted it. Thanks

[t444ebusser]

It looks like the side of the master cylinder reads -

50.60 2
Bore

Does the stamping indicate I have a 2" bore?

Thanks!

[sportyrick]

your master cylinder is leaking and the fluid is seeping into the booster and it's ruined the diaphram in the booster and that's where the air sound is coming from, expensive repair for sure. Do not seal up the leaking area, it will get worse and deadly, replacement of both is only option if I am correct, professional opinion is necessary.

[t444ebusser]

Spoke with a very helpful fellow at Sweeting Performance (powerbrakeservice.net). He noted the stamping on the side of my master cylinder was metric. 50.8 mm = 2 inches. So I have the one with a 2 inch bore. I swapped a master cylinder over from my backup unit. the booster diaphragm on both vehicles looked rough so these will get rebuild/replaced. thanks for help guys.