No brakes/pressure So after changing nearly everything (front rotors and pads, rear rotors and pads, both rear calipers, and master cylinder) and then bleeding the system three times starting from rear passenger side to rear driver and then front passenger and then front driver. Then also bleeding master cylinder and abs unit twice still have no brake pressure when car is on. Also makes a hissing sound like air escaping when pushing pedal. Anybody have any ideas

There are at least 2 items that will cause your problem. The first is when you changed the pads you place the caliper in a different place on the support pins that the caliper slides on to centralise the brakes on the rotor. These mounting pins are prone to rusting up and actually keeps one pad on the rotor as the caliper cannot centralise during brake application. The second is a problem that occurs when the brake fluid is pushed back into the master cylinder reservoir from pushing the piston back into the caliper. Muck in the lines is pushed back into the compensating ports in the Master cylinder causing the brakes to drag and build up pressure from the heat generated by having the brakes on. Try flushing out the brake system using metholated spirits or replace the master cylinder

Here ya go! This is for the rear brake pads removal:

Removal & Installation

1. Remove the brake master cylinder filler cap. Check brake fluid level in brake master cylinder reservoir. Remove fluid until brake master cylinder reservoir is half full.
   
2. Raise and support the vehicle.
   
3. Remove the wheel and tire assembly.
   
4. Inspect the brake pads for wear or contamination. If worn, damaged or past specification, install new components.
   
5. Remove the caliper pin bolts.
   
6. Remove the rear disc brake caliper.
   
7. Remove the brake pads and rail clips.
   
8. Inspect the disc brake caliper for leaks. If leaks are found, disassembly is required.
   
9. Installation is the reverse of removal. Observe the following torques:
   
   • Caliper bolts: 27 ft. lbs. (36 Nm)
     
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Disk brakes are automatically self adjusting. If you have too much travel in the pedal, bleed the brakes. Let us know if you need the procedure.

They are actually pretty simple, but check or replace the rotors before you install new pads. The front discs have 2 bolts per caliper as do the rears. There are hardware clips that are different on the front and rear.

You unbolt the caliper and tie it up with a rope or coat hanger so the caliper does not hang by the brake hose. Service the rotors and then when you are ready to replace the caliper, you take off the master cylinder cover. Then you use a "C" clamp to drive the caliper piston flush into the caliper. Doing this will force Brake fluid back into the Master cylinder. This is why the Master cylinder cap must be off. Attach the brake pads with a chemical to eliminate rattles and then slide the loaded caliper over the rotor. Attach the 2 bolts on the caliper and then you are ready to bleed the system.

Repeat this on each wheel and then bleed all 4 wheels. There will be very little air in the system using this method. The back brakes have the E-Brakes inside the rotors. If you pull off the rear rotors you will have to loosen the E-brakes by turning the Starwheel inside the rotor to allow for more clearance. Adjust the same Starwheels by tightening until independent wheel drags substantially, then loosen up 5 or more clicks on the Starwheel.

The calipers will take care of themselves and center themselves through use. Thats about all I can say about this process. I hope this helps you.

Removal & Installation Front To Remove:

1. Inspect the fluid level in the master cylinder reservoir. Remove fluid from the reservoir until the level is lower then half way between the MAX and MIN levels.
2. Remove the tire and wheel assembly.
3. Install 2 wheel nuts to secure the rotor on the hub.
4. Remove the bottom brake caliper pin bolt.
5. Pivot the brake caliper body upward and secure out of the way. Do NOT disconnect the hydraulic brake flexible hose from the caliper.
6. Compress the piston back into the bore using a C-clamp. Figure of brake assembly with caliper raised showing brake pads in mounting bracket
   
   
7. Remove the inboard and outboard brake pads from the brake caliper bracket.

To Install:

1. Install the brake pad retainers and both brake pads into the caliper bracket.
2. Pivot the brake caliper down over the brake pads and into the brake caliper bracket. Insert the lower brake caliper pin bolt and torque bolt to 70 ft-lb. (95 Nm).
3. Reinstall the tire and wheel assembly.
4. Lower the vehicle.
5. Refill the master cylinder. Pump the brake pedal several times to seat the pads against the rotor.
6. Check the master cylinder level and add fluid as necessary.

Rear To Remove:
Rear disc pads R&I

1. Inspect the fluid level in the master cylinder reservoir. Remove fluid from the reservoir until the level is lower then half way between the MAX and MIN levels.
2. Remove the tire and wheel assembly.
3. Install 2 wheel nuts to secure the rotor on the hub.
4. Remove the upper caliper mounting bolt.
5. Pivot the caliper down to access the pads.
6. Remove the inboard and outboard pads from the caliper bracket.
7. Remove the brake pad clips from the caliper bracket.
8. Compress the piston back into the bore using a C-clamp and the old inner pad.

To Install:

1. Install new brake clips in the caliper bracket.
2. Install the inboard and outboard pads in the caliper bracket.
3. Pivot the caliper up over the pads.
4. Reinstall the upper mounting bolt and tighten to 32 ft. lbs. (44 Nm).
5. Remove the 2 wheel nuts securing the rotor.
6. Reinstall the tire and wheel assembly.
7. Refill the master cylinder. Pump the brake pedal several times to seat the pads against the rotor.
8. Check the master cylinder level and add fluid as necessary.

YOU NEED REMOVE A LITTLE BRAKE FLUID FROM MASTER CYLINDER.THEN YOU RAISE VECHICLE SAFELY.SUPPORT IT WITH JACK STAND.MAKE SURE VECHICLE IS ON LEVEL SOLID GROUND.REMOVE TIRE OR WHEEL.THEN YOU NEED A LARGE C - CLAMP.PLACE C - CLAMP OVER BRAKE CALIPER AND BRAKE SHOE BACKING.TIGHTEN C - CLAMP JUST ENOUGH PUSH CALIPER PISTON BACK IN CYLINDER BORE TO REMOVE CALIPERS FROM ROTORS.TO REMOVE BRAKE CALIPER YOU NEED 2 OPEN AND BOX END WRENCHES ONE TO HOLD CALIPER SLIDE PINS AND THE OTHER WRENCH FOR LOOSEN CALIPER BOLTS.THEN YOU REMOVE CALIPER AND REPLACE FRONT BRAKE SHOES.IF YOU NEED TO REMOVE BRAKE ROTORS JUST REMOVE THE BRAKE CALIPER CARRIER SUPPORT BOLTS THE REMOVE THE BRAKE CALIPER CARRIER SUPPORT THEN REMOVE ROTOR.YOU NEED TO REPLACE BOLTS WITH NEWS AND USE LOCK TIGHT.THEN YOU PUT IN NEW BRAKE PADS IN CALIPER PUT CALIPER BACK ON SUPPORT CARRIER.REPLACE WITH NEW BOLTS USE LOCK TIGHT THEN TORQUE BOLTS TO 26 FT LBS.MAKE SURE MASTER CYLINDER COVER IN PLACE.WHEN YOU FINISH REPLACING BOTH FRONT BRAKE PADS PUMP BRAKE PEDAL TO SEAT BRAKE SHOES AGAINST BRAKE ROTORS SO YOU WILL HAVE FIRM BRAKES WHEN YOU APPLY THEM. THEN CHECK YOUR BRAKE FLUID LEVEL IN MASTER CYLINDER MAKE SURE ITS NOT LOW. MAKE SURE YOU HAVE FIRM BRAKES BEFORE DRIVING.IF YOU HAVE ANY PROBLEMS CHANGING FRONT BRAKE PADS YOU CAN GO TO ANY AUTO PARTS STORE AND BUY A HAYNES REPAIR MANUAL.

YOU NEED TO REMOVE 2/3 BRAKE FLUID FROM MASTER CYLINDER.THEN YOU WILL NEED A LARGE C -CLAMP.OPEN C - CLAMP PLACE C - CLAMP OVER TOP BRAKE CALIPER AND AGAINST THE BACK OF THE OUTBOARD BRAKE PAD. THEN TIGHTEN THE C -CLAMP UNTIL THE CALIPER PISTON IS PUSHED INTO THE CALIPER BORE JUST ENOUGH TO SLIDE CALIPER OFF THE ROTOR.WARNING WHEN FINISHING BRAKE JOB.PLACE COVER BACK ON MASTER CYLINDER.TAKE FOOT PUMP BRAKE PEDAL UNTIL YOU GET SOLID BRAKES.THIS SEATS BRAKE SHOES AGAINST THE ROTOR.THEN RECHECK BRAKE FLUID LEVEL IN MASTER CYLINDER.

It can be the wheel Hub bearings. The rotors if warped will wear out pads early. Bad calipers are another possibility as well as a bad Master cylinder.

If the Hub bearings are bad your tires will have cupping. If the tires are okay the rotors are warping from contact with the pads. The pads won't release if the calipers are jamming OR the Master Cylinder is keeping pressure to the calipers.

You can get a pressure check done on the Master cylinder to see if the pressure is releasing when your foot is off the brake. If the pressure is releasing then the calipers are probably sticking. Make sure to use new brake hardware and a lubricate for the hardware when you assemble the calipers.

Replace brake hoses,they have an inner core that has ruptured and the outside rubber core is keeping pressure on the caliper with you foot off the brake. This will fix it! A common problem for this vehicle.

Bleed the master cylinder first. You have to do that before you belled any calipers or wheel cylinder.