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Question:

Can i bleed only the rear brakes in my van(or should i do both)?

BLeeding the brakes should i do just the rear or can i just do tha back tires?i am not exactly sure what a combination valve is either and their telling me to hold it open during the bleeding process.a little advice would be nice for this its a 1978 chevy 20 van.thanks!

Answer:

it would have to be a very small house and it would have to have tiny 12V appliances (or you would have to step up the voltage with some kind of transformer the maximum theoretical amount of energy available from your water drop can be easily calculated (the actual will be considerably smaller than max theoretical, but it will give you a ball park feel) the energy is equal to the mass of the water times elevation squared times the accelleration of gravity (mgh) you didn't provide the flow rate you had but suppose you had 100 gal/min of water, and the 10 ft drop 100gal/min(min/60 sec)*(8.34 lbm/gal)*10ft * 32.2 ft/sec^2 now, divide by the constant gc 32.2 lbm-ft/lbf-sec^2 139 ft-lbf/sec since 1 ft-lbf 1.36 watt-sec 190 watts so, if I have done this right (and I very well may have messed something up trying to type my arithmetic) it looks like 100 gal/min of flow, with a 10 foot drop, could generate 190 watts or, not quite enough to power two 100 watt bulbs the actual energy you might get would be considerably less than that, depending on the quality of your turbine-generator you probably would get less than half of theoretical you should check my math, but the principle is sound the amount of energy available is the energy lost by the water which is the mass of the water times the change in altitude that you are harnessing good luck
Might be better to get an old auto generator. These generate at lower speeds but the voltage will be based on the speed too. You will have to get an alternator spinning quite fast. There are micro turbine water generators on the market directly for your purpose. Charge a battery and use an appropiately sized inverter and run your normal appliances of it. Forget the fridge and other high load items though. If you do go with the alternator remember that they are actually 24VAC 3 phase prior to the regulator/rectifier and could be stepped up but your hertz and quality would be suspect.
which you will hire/purchase a caliper compressor for purely this application. Its least complicated a pair greenbacks at autozone or stronger automobile. regardless of the certainty that in case you have not any $$ you are able to desire to apply a c-clamp or a extensive pair of pliers. All think approximately to do is compress the piston returned into the caliper. this would take slightly bitcontinual. be sure you dont harm the piston.
i,am not sure what your saying but say if the back brakes go out and you have to replace a wheel cylinder, a hose or line then the both back wheels are the only wheels you have to bleed because air can,t get into the front brakes.
bleed it front and rear. T?o increase safety, most modern car brake systems are broken into two circuits, with two wheels on each circuit. If a fluid leak occurs in one circuit, only two of the wheels will lose their brakes and your car will still be able to stop when you press the brake pedal. The master cylinder supplies pressure to both circuits of the car. It is a remarkable device that uses two pistons in the same cylinder in a way that makes the cylinder relatively fail safe. The combination valve warns the driver if there is a problem with the brake system, and also does a few more things to make your car safer to drive. In this article, we will learn how the master cylinder and combination valve work. If you haven't read about basic car braking concepts in How Brakes Work, be sure to check it out.

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