HydroBoost Leak?
Thread Starter
Le Mans Master
Joined: Aug 2000
Posts: 6,273
Likes: 14
From: Austin TX
HydroBoost Leak?
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?
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?
Race Director
Joined: Nov 2000
Posts: 11,872
Likes: 12
From: Waterloo ontario Canada
Re: HydroBoost Leak? (Twin_Turbo)
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.
Thread Starter
Le Mans Master
Joined: Aug 2000
Posts: 6,273
Likes: 14
From: Austin TX
Re: HydroBoost Leak? (norvalwilhelm)
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?
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?
Le Mans Master
Joined: Jul 2000
Posts: 6,001
Likes: 112
From: Saginaw Michigan
Re: HydroBoost Leak? (flynhi)
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
Jim Shea
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
