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Roy Braatz, Roy Braatz, Roy Braatz, come in please!! Where are you?
If Roy will just chime in now with pictures of the pwr brk booster that is on his 55, you can see an excellent setup that is almost undetectable. I don't know how well his pb setup works, but if it works good, it's one of the best I've seen on an early Vette. It is installed down real low below the stock master cylinder, on top of the splash pan.
Why would you want to use a hydroboost system. I've worked on them. I've never liked them. They were one of GMs bad ideas.
Richard Newton
I have hydroboost system on my 61 from an Astro Van. I have
disc brakes all around with a 2 psi residual pressure on the rear wheels.
I bulit an adapter to bolt it to the regular mount point and it works
great with the power steering setup. I think it's much better than a
vaccum system.
If the engine dies while driving, do not pump the brakes. It is hard to
stop without the pump going. There is a reserve tank good for one
stop without added pressure.
I have posted the power brake and power steering installs on this
forum.
What's the reason for the RPV on the rear disc brakes?
The dual master cylinder and proportioning valve has two outlets for the
front brakes and a single line to the rear. I thought 2 psi would give
the rear a little head start. Probably not needed. However, two psi
does not create any drag on the pads.
I used a Chevy pickup truck dual MC. (Has a single bail for the cover)
Probably from the 70's.
The dual master cylinder and proportioning valve has two outlets for the
front brakes and a single line to the rear. I thought 2 psi would give
the rear a little head start. Probably not needed. However, two psi
does not create any drag on the pads.
I used a Chevy pickup truck dual MC. (Has a single bail for the cover)
Probably from the 70's.
Ray
70's pickups didn't have rear disc brakes, so that master cylinder probably already has an internal RPV at the rear system port, unless you removed it.
Makes no difference that there are two outlets for the front and a single line to the rear - so do all '65-up Corvettes; hydraulic displacement is instantaneous throughout the system, so there's nothing to "catch up".
I put a Hydroboost on my 66 Chevelle from Hydratech, the Chevelle runs about 5inches of vacuum in drive at idle, excellent set up highly recommend and will install one on my 63 SWC resto-mod. The key is too match the pressure on the your PS pump to the unit and a proper reservoir
Corvette Central sell a kit that will bolt on. I have installed one on my 61 with a BBC in it. Have not tried it yet so cannot comment on the performance. Apologies for the pics. They are the only ones I have and the Vette is in bits now.
70's pickups didn't have rear disc brakes, so that master cylinder probably already has an internal RPV at the rear system port, unless you removed it.
Makes no difference that there are two outlets for the front and a single line to the rear - so do all '65-up Corvettes; hydraulic displacement is instantaneous throughout the system, so there's nothing to "catch up".
So you are saying that the last house on the water line does not
have the lowest pressure....
Even with only a 2 psi rpv, you are dragging the brakes needlessly.
See if there is any drag, by rolling the vehicle on level ground, after hitting the brakes and releasing them (engine off, in neutral of course).
If unsure that there is drag, after doing test one, crack the bleeder open for just a moment (to release any pressure), and try the rolling test again (without hitting the brakes).
John (Plasticman)
Last edited by Plasticman; 09-30-2015 at 11:28 AM.
Even with only a 2 psi rpv, you are dragging the brakes needlessly.
See if there is any drag, by rolling the vehicle on level ground, after hitting the brakes and releasing them (engine off, in neutral of course).
If unsure that there is drag, after doing test one, crack the bleeder open for just a moment (to release any pressure), and try the rolling test again (without hitting the brakes).
John (Plasticman)
Thanks John,
I tested this when I installed the rpv. I just jacked up the two rear
wheels with the shifter in neutral and turned them by hand. I had pumped the brakes once to test the hydroboost reserve can. There
was some drag on the disc (I could hear it rub). I have not worried
about it, because the front disc's rub some also.
Thanks for the reply. You seem to be one of the few who can give
a civil response.
I am trying to bring my C1 up to date.
Power steering
Power brakes (disc)
A/C
Power windows
Power antenna
Power door locks
Digital clock is next.
Necessary, No...
But, my daughter will drive it when I'm gone.
Ray
I have all that, my 12 year old girl could push the brakes enough to stop the car.
But I read an article in car craft a while back, parts came from a late model chevy truck, seemed like a nice set up. I had to change the unit on my truck it started leaking.
Last edited by John S 1961; 10-02-2015 at 12:30 AM.
09-28-2015, 11:37 PM
