BRAKE SYSTEM Brake light on ,master cylinder empty,leak in part just in front of passenger rear tire. Need to know name of part and approximate cost to fix. Son-in-law replaced front brakes in June. Vehicle has 84,000 miles.

You always start with the brake that is furthest away from the master cylinder. On most vehicles, it is the passenger rear. Bleed until nothing but clear fluid comes out of the bleeder valve and make sure that the fluid does not go empty in the master cylinder reservoir. Then move to the next closest brake, usually the drivers rear, then to the next closest, usually the passenger front, then finally the last brake. If you do not end up with a proper operating brake system, there must be an issue in the system. Bad master cylinder, booster, or ABS system are likely suspects.

You need to start at the brake that is furthest away from the master cylinder. If it is on the drivers side under the hood, start with the passenger rear wheel. Bleed until nothing but clear fluid comes out. Then move to the drivers rear and do the same. Next to the passenger front and finish with the drivers front. Make sure you do not empty the master cylinder in the process or you will have to start all over. If you get finished and still do not have a good pedal, you might need to change the master cylinder.

Hi Chris, The brake system is basically very simple. If you have duel braking on your vehicle, the usual method is having two brakes operate on the front with for example the left rear and the other system will also operate two front and the right rear. This type of system will have two calipers on each of the front wheels. The tandem system works in a slightly different way, having the forward part of the cylinder pressurizing the rear brakes and the rear part of the cylinder pressurizing the front. I think under the circumstances you are describing, I would have a friend sit inside and pump the brakes repeatedly until the system becomes pressurized (maybe twenty thirty times of pumping the brake pedal) and then ask him or her to keep it pushed firmly down until you find out where its leaking. The amount of brake fluid you report having been sed would indecate a severe leakage. Check the lower parts of the rear wheels for signs of leaking wheel cylinders and then dito for the front wheels. Any signs of wetness at these areas and along the brake system (the plumbing or pipe work) will indicate where the leakage is. If you cannot identify a wheel which is leaking, carefully inspect around and blow the master cylinder and if this no sign go along the fluid lines, taking special note of where the damaged pipe was repaired. If there is a blockage in the line, air may be trapped at that point causing difficulty in pressurizing. Once the place of leakage has been identified it must be attended to before bleeding the system. When bleeding, begin with the wheel furthest from the master cylinder, and work your way back to the master cylinder one wheel at a time, until you reach the closest.Keep in mind that you may find it required to pump the pedal many many times before opening the bleed nipple.Regards John

fill master cylinder, start at right rear. the way I do it is make sure cap is back on master cylinder. pump the brakes a few times then hold them. have another person open the bleeder valve at the tires until brakes go to floor. hold them down until bleeder is retightened but be sure master cylinder is not out of fluid. then go to left rear and do the same procedure, then right front, then left front. check fluid and if air is all out there should be brakes. good-day ! THIS IS HOW I HAVE ALWAYS DONE IT ! heres a little trick of sorts. you can change a master cylinder, and if you bench bleed it first. and no fluid is lost from the master cylinder lines you do not need to bleed the whole system. but make sure cylinder is full of fluid before putting on vehicle and all air is out of master cylinder.

first thing have some one push the brake for you. every time thay push. look very close at each tire to see if you see brake fluid then look from passenger side looking at the driver side frame if you find no leaks any ware all ales its the master cylinder

You may need to further bleed the brakes. Something pumping to bleed the brakes can **** in air at the brake fluid reservoir. Try using a vacuum pump to **** out brake fluid from the release screw at the brake side. Make sure you always have enough fluid at the reservoir.

Normally when the brake pedal goes almos to the floor it is an indication of low brake fluid. Low brake fluid is an indication that front and/or rear brakes are wearing. As the brake pads wear down more brake fluid will be required in the wheel cylinders or calipers. Hint, the front brakes usually wear much faster than the rear due to the fact that the fronts due a much greater braking function that the rear. Check the front pads. Don't let them get down to the metal scraping metal stage before you change them out. This causes unnessary damage to the rotors. Look at your master cylinder on the firewall under the hood in front of the steering wheel. If the fluid level is belowhte "max" mark add fluid. Low fliud should also show as a red "brake" light on your dash, but not always.

possible leak in brake system. if not then you have a bad master cylinder. have to replace it.

This sounds like a leaking caliper or brake line. More like a hole in the brake line if it's spraying out -- this is often caused by a brake line rubbing against the chassis. Needs a thorough visual inspection to determine where the brake fluid is originating.

Charlie

brake system not purged properly, might have air inside or front brakes have leak