brakes

[rellik god]

im thinking about swapping to a hydroboost brake system and getting rid of the vacuum booster.dose anybody know the bolt spacing for the vac booster

[gadget73]

well, theres not really any good reason to do this unless you're going to forced induction, but if you use 84 Mark VII hydroboost parts, it fits together. Same master cylinder and I'll bet the 4 bolt spacing on the firewall is the same too.

[rellik god]

radical camshaft will be able to play nice with your power brakes. Just think--horsepower and stopping power at the same time!
just a thought and engine bay space clears up
i had a 77 country squire wag with one and it stopped that 4600 pound car
this is just a project im thinking of doing.

[rellik god]

I discovered that one of the benefits is that brake line pressures of 2500 psi to 3500 psi can be achieved, where vacuum boosters can muster only 800 psi - 1000 psi.

[cld783]

I dont know much about these but doesn't it run off your power steering pump or something?

[85crownHPP]

Yes it does, and seems like quite a silly mod to me and waste of space and money. Vacuum assist is more than adequate, unless you are a little old lady who cant press on the brake very hard...

[rellik god]

switching to hydro means pushing less and that little old lady who cant press on the brake very hard would just tap the pedal and send the other old ladys flying through the windshield.

[gadget73]

If you're running so much cam that you produce no vacuum, the car is probably not going to move out of its own way untill you wind the hell out of the motor so around town it won't matter.

The stock brakes also lock way too easily with the vacuum boost, so honestly unless you're upgrading the brakes I would not suggest this. It would probably make the pedal far more touchy than it currently is, likely to the point of being dangerous.

[rellik god]

im doing the big brake upgrade and rear discs and i just thought of putting in the hydro
over the vacuum booster.the reason why is if the vac boost fails or your engine dies
you sort of have no brakes.the hydro booster also has a part called an accumulator in it that stores the pressurized fluid and allows at least one or two assisted pumps of the brakes if the engine quits running.

[85crownHPP]

Only the same little old lady would have much trouble stopping in a loss-of-vacuum situation... not trying to criticize, just saying the "money/time better spent elsewhere..." spiel... but if you want it, go for it!

[P72Ford]

We have a very radical cam in the 350 Chevy in our Monte Carlo race car. It still pulls 10+ in hg idling.

[351m]

im doing the big brake upgrade and rear discs and i just thought of putting in the hydro
over the vacuum booster.the reason why is if the vac boost fails or your engine dies
you sort of have no brakes.the hydro booster also has a part called an accumulator in it that stores the pressurized fluid and allows at least one or two assisted pumps of the brakes if the engine quits running.

If the brakes are working right there is still a couple of pumps of assist with the vacuum assist as well. Adding more hydraulic lines under the hood just increases your chances of a problem or if god forbid a line were to burst and spray a hot header... a huge fire.

[gadget73]

You get 2-3 pumps with assist even without the engine running if you have a good booster and there are no leaks around the check valve. I had to replace my check valve and fix a leak where it plugs into the booster to fix this on my car. I'm running an original booster and MC with my big brakes and rear disc, and it feels very nice.