flynhi

On final check out before dropping the 71 hanger queen back to the ground, a leak has developed between the rear of the master cylinder and the front of the hydroboost. The leak is power steering fluid and is dripping from the cast in weep hole in the hydroboost casting.
These were assembled without a gasket between.

Is the leak due to the lack of a gasket or does this mean I have a leak inside the hydorboost itself?

Twin_Turbo

it means a leak inside the hydrobooster, you mean that weep "slot" cut into the nose of the HB?


[Modified by Twin_Turbo, 3:20 PM 8/30/2003]

norvalwilhelm

Twin Turbo is right. There is a slot cut to allow leakage if the hydraboost leaks or the master cylinder. No gasket is required and the maiting surgaces has a groove cut in the underside.

flynhi

Ok. I understand that no gasket is required between the master cylinder and the hydroboost.
We have now removed the HB and disassembled it. Is this unit supposed to have O rings inside between the cylinders and pistons? We find none.
Any ideas where the internal leak might be that would exit at the weep hole?

Anyone have an exploded parts diagram for this unit?

Jim Shea

I have a blowup of a Hydroboost unit from a 1977 Chevrolet Repair Manual. I can't guarantee that the unit wasn't changed or updated through the years. I can send you a scan by eMail if you want.

Jim Shea

flynhi

Thanks Jim,
I'd appreciate that very much.
will_shepherd@hotmail.com


[Modified by flynhi, 10:21 PM 8/31/2003]

Jim Shea

Will,
You have mail.
Jim

Twin_Turbo

Please send it to me too

Thanks,

Marck

Jim Shea

Marck,
You have eMail.
Jim

Twin_Turbo

excellent :thumbs: thanks again.

flynhi

Jim, I've been having some problems with my ISP. If your email got kicked back, please try again.