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'78 Buick Regal Sport Coupe

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  • Re: '78 Buick Regal Sport Coupe

    Gotcha. I was thinking it was a Buick car of some model.

    I looked up a '83 Pontiac Grand Prix Diesel which used HydroBoost and the part numbers are slightly different from the truck.

    Car - AC Delco # 14bp4139

    Truck - Ac Delco # 14pb4147


    Car - Cardone # 527211

    Truck - Cardone # 527307

    All of which tells of some difference, but perhaps in configuration only? Maybe in the pedal rod?

    Of all the paths you take in life - make sure a few of them are dirt.

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    • Re: '78 Buick Regal Sport Coupe

      Are all hydroboosts' created equal I wonder? The TurboBuick crowd likes to adapt Astro units to the G-body - I wonder how the squarebody unit compares.


      Tried to look up '86 Astro application part numbers on RockAuto, but am not finding the Hydroboost listed as a replacement part under power brake booster.

      I do find the '86 truck unit available from Cardone 527307 #14055057 and ACDelco 14pb4147 #19286847 for $130

      Anyone know what years Astros used Hydroboost?
      yes - they are all created equal except there are 2 capacities....
      silver_bullet likes this.
      Doing it all wrong since 1966

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      • Re: '78 Buick Regal Sport Coupe


        yes - they are all created equal except there are 2 capacities....
        Capacities as in volume/flow of PS fluid? Or boost output?
        Of all the paths you take in life - make sure a few of them are dirt.

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        • Re: '78 Buick Regal Sport Coupe


          Capacities as in volume/flow of PS fluid? Or boost output?
          I'm fairly certain they're classed by vehicle weight - I use the time-tested method of buying the cheaper of the two and have had good luck with that.... that said, I haven't yet driven my Corvette.... but the cheaper is the more numerous, the more numerous is the lighter duty one..
          Doing it all wrong since 1966

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          • Re: '78 Buick Regal Sport Coupe

            I have a car power steering pump on my hydroboosted flatbed.. Not quite up to par on braking and turning during low speed stuff..

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            • Re: '78 Buick Regal Sport Coupe

              Today I found a third set of part numbers for the Astro Hydroboost.

              So to summarize, the C-30 truck, diesel G-body car, and the Astro van all have different part numbers for the hydrobooster.

              I have cobbled worse stuff together. The truck unit is complete and matches itself in the pump department anyways.

              And overboosted brakes might be a good thing for this driver eh?

              In it goes.
              Last edited by STINEY; August 9th, 2019, 10:47 AM.
              Of all the paths you take in life - make sure a few of them are dirt.

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              • Re: '78 Buick Regal Sport Coupe

                you saw how I did the hydroboost on my Corvette? copy that... with that said, the Buick is getting vacuum assist but then a vacuum pump and reservoir.... you do create vacuum at highway speeds, even with the draw-through turbo design.... and at this point, it's almost even money doing vacuum assist vs. hydro
                Doing it all wrong since 1966

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                • Re: '78 Buick Regal Sport Coupe

                  Yep. Lower the booster centering hole to the center of the mounting bolt square, use the power brake pivot on the pedal arm, make rod correct length, done.

                  Speaking of pedal arm pivots - TurboBuick guys swapping away from the factory PowerMaster system to the Hydraboost use the same pivot, while the TurboBuick guys swapping from the PowerMaster system to standard Vacuum boosters have to move the pivot DOWN 3/4", which would DECREASE pedal leverage.

                  I've done the power to manual pedal ratio swap on several cars - what I don't understand is the difference between the PowerMaster/HydroBoost pivot location and the Vacuum boosted pivot location?

                  They are both power booster systems. So the PM and HB systems use a pedal ration closer to a MANUAL ratio? While the Vacuum ratio is all out there by itself?

                  Not what I would have expected to find.

                  (just gonna drop this here) https://turbobuick.com/threads/brake...to-vac.418576/
                  Of all the paths you take in life - make sure a few of them are dirt.

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                  • Re: '78 Buick Regal Sport Coupe

                    Different mounting plates, push rods, and in some cases reserve canister sizes. There is a Bronco site out there that detailed a lot about the different types. The late Astro stuff has a really weird mounting plate to mount to the angled firewall and stay horizontal.
                    Last edited by CTX-SLPR; August 10th, 2019, 04:59 PM.
                    Central TEXAS Sleeper
                    USAF Physicist

                    ROA# 9790

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                    • Re: '78 Buick Regal Sport Coupe

                      Different mounting plates, push rods, and in some cases reserve canister sizes. There is a Bronco site out there that detailed a lot about the different types. The late Astro stuff has a really weird mounting plate to mount to the angled firewall and stay horizontal.
                      Thanks for the lead. Good reading and great info.

                      I have the truck unit off - it has a massive mounting plate compared to the astro and gbody units. Its really TALL, but that's just more material to work with.

                      Of all the paths you take in life - make sure a few of them are dirt.

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                      • Re: '78 Buick Regal Sport Coupe

                        California yard considers this a "rechromeable core".

                        Yeah, around here its "driver quality". Steel chromed skin with an aluminum core brace. One more piece of the puzzle solved.

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                        Russell and silver_bullet like this.
                        Of all the paths you take in life - make sure a few of them are dirt.

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                        • Re: '78 Buick Regal Sport Coupe

                          Will removed the last bolt on the truck engine donor last night, while I cut the exhaust off.

                          More proof of a low-mileage donor. These factory exhaust heat shields went from the downpipes all the way back to the large-by-huge 2' factory mufflers.

                          Anyone remember these on their square-body trucks?

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                          silver_bullet likes this.
                          Of all the paths you take in life - make sure a few of them are dirt.

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                          • Re: '78 Buick Regal Sport Coupe

                            damn, look at all that rust!
                            Deaf Bob likes this.
                            Doing it all wrong since 1966

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                            • Re: '78 Buick Regal Sport Coupe

                              I did mention the truck was heading to the scrapyard. Wasn’t because it was outta style......
                              Dan Barlow likes this.
                              Of all the paths you take in life - make sure a few of them are dirt.

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                              • Re: '78 Buick Regal Sport Coupe

                                Last major piece arrived today.

                                I about cry when I see how rust free this car sitting in a junkyard in Arizona must be. At least our interiors don't turn to powder......


                                And the skid/crate had a slightly mangled box loose inside it. Do all quarter panels from Phoenix include a complimentary brand new guitar stand? Thanks Amazon fullfilment, guess now I just need a guitar.

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                                Of all the paths you take in life - make sure a few of them are dirt.

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