Quote:
|
Ogre, Kim, and Hi....what are the pedal ratios and bore diameters of the MCs on your setups? I understand that these are important factors in these setups.
|
I'm not Ogre or Kim, but you are very right that bore diameter is important.
When I installed Hydroboost in my 1995 Blazer a couple of years ago I did a fair amount of research at the parts store with catalog and part in hand. All of the GM hydro-boost master cylinders that I checked at that time were 1.25" diameter straight bore including the old integral reservoir steel versions and the hybrid G van aluminum reservoir / steel master types. Increasing bore size reduces pressure applied to the wheel cylinders / calipers. OTOH increasing caliper piston or wheel cylinder diameter delivers more braking force to the drums/rotors with the same pedal effort.
Quote:
|
If my MC bore size is 1 1/4" can I use the Nissan Quest MC of 1 1/8"? will that cause an issue? My setup is from a 96 Astro Van.
|
Thy Hydro-boost booster can easily generate a large amount of force at the master cylinder even with the large diameter piston. If the Quest cylinder fits you will be delivering very high amounts of force to the wheels which could result in touchy brakes. GM boosters use a slightly larger master cylinder bolt pattern than Ford or Dodge units and from personal experience, most of the GM vacuum booster master cylinders do not attach properly to the GM hydroboost booster. I will add that it's important to add a cooler to the PS return line if using Hydro-boost. The 97+ one ton vans in our fleet come with a 3" by 10" factory cooler which is insufficient for the type of driving we do (school buses). Until I replaced the coolers with larger units we had a lot of trouble with the pumps seizing and shearing the main shaft. My Blazer PS return line is plumbed through a trans cooler large enough for a 10k lb truck.
Quote:
Anyone running Astro van parts?
Any one else want to throw pic's of whatever they are running for HB?
|
Here's my Blazer swap.
http://www.s10forum.com/forum/f14/fi...-notes-332547/
Quote:
|
I spent a shade under $75 on Astro van HB / MC setup (at under $75, why not?) and am now day dreaming about how to make it work. The reservoir on the MC is tall, though I think it could still be done under floor. If not, I can always firewall mount it...
|
I have an Astro booster. Since all master cyls were the same bore, I used a reman from a 95 c 2500 w/ 6.5 diesel. It was $30 and maybe core charge was another $10. IIRC the fittings are larger so you may need to head to a good parts store and pick up specialty fittings to connect your 3/16" and / or 1/4" brake lines. The plastic reservoir on that master (and on your Astro master) will interchange with many other models. It just pops off. My Blazer is using the stock Blazer reservoir.
4X4 guys can get pretty crazy with brake swaps and there is probably a year's worth of reading at pirate4X4.com just relating to Hydroboost. Add in the very good tech on designing and sizing your brakes or your vehicle (the brake bible) and there's no excuse for putting together a system that doesn't work right "out of the box."
Quote:
|
I'd like to know why it's called "Hydro Boost" which would infer a water operated system and not "Hydra Boost" which would describe a hydraulically operated system (which it is). Can someone enlighten me?
|
Sure. It's called "Hydro-boost" to differentiate it from "Hydro-vac."
