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Air over hydraulic brakes

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05-29-2012, 07:27 PM
Jim and Tere
Air over hydraulic brakes
I'm not familiar with this system. Could somebody give me a quick primer on how it works?
Jim


Jim and TereJim and Tere

1985 Regal
29' Chevy 454 P32
8411 3172 29FP3B
Gear Vendor 6 Speed Tranny
05-29-2012, 10:57 PM
Rusty
It's relatively simple(And this is the abbreviated version). It's the converse of power brakes on a car, which uses a vacuum to assist. The vacuum allows atmospheric pressure to add to pedal pressure. Air-over-hydraulic just uses air pressure (higher than atmospheric) from the engine compressor to provide the assist.


Rusty


MilSpec AMG 6.5L TD 230HP; built-to-order by Peninsular Engines:  Hi-pop injectors, gear-driven camshaft, non-waste-gated, high-output turbo, 18:1 pistons.  Fuel economy increased by 15-20%, power, WOW!"StaRV II"

'94 28' Breakaway: MilSpec AMG 6.5L TD 230HP

Nelson and Chester, not-spoiled Golden Retrievers

Sometimes I think we're alone in the universe, and sometimes I think we're not.
In either case the idea is quite staggering.
- Arthur C. Clarke

It was a woman who drove me to drink, and I've been searching thirty years to find her and thank her - W. C. Fields
05-30-2012, 07:20 AM
Jim and Tere
You have had some problems with some kind of a pump, Rusty. Did it have anything to do with the brakes?


Jim and TereJim and Tere

1985 Regal
29' Chevy 454 P32
8411 3172 29FP3B
Gear Vendor 6 Speed Tranny
05-30-2012, 09:12 PM
Rusty
Yes, but my system (being slaved to a GM-based engine) is hydraulic over hydraulic, GM's abominable Hydroboost. The power steering pump also supplies pressure for brake boost.


Rusty


MilSpec AMG 6.5L TD 230HP; built-to-order by Peninsular Engines:  Hi-pop injectors, gear-driven camshaft, non-waste-gated, high-output turbo, 18:1 pistons.  Fuel economy increased by 15-20%, power, WOW!"StaRV II"

'94 28' Breakaway: MilSpec AMG 6.5L TD 230HP

Nelson and Chester, not-spoiled Golden Retrievers

Sometimes I think we're alone in the universe, and sometimes I think we're not.
In either case the idea is quite staggering.
- Arthur C. Clarke

It was a woman who drove me to drink, and I've been searching thirty years to find her and thank her - W. C. Fields