Here is what I have found out. I have an 2008 Toyota Tundra 5.7 4x4, and I changed the rear brakes and rotors. No noise prior to service. After installing new rotors, I started getting a metal scraping noise. After $300.00 in diagnostics, I found that the new rotors are rubbing the against the brake shield. The inner lip of the rotor needs to be machined down to avoid this rubbing. See toyota tundra forum.com for pics.
SOURCE: Brake rotors
Are there small retainer clips on the studs still? More than likely its just rust built up on the center hub. Take some sand paper to the center hub, as long as e-brake is released and caliper is off, it will come off. I'm not familar with the toyota sienna's but if they have internal drum e-brakes, I would back off the adjuster if they do.
SOURCE: 2003 Toyota Sequoia Rear Brake Rotor Removal
You need to go into the access hole in the rotor and back off the park brake shoes, which are located inside the rotor.
SOURCE: Toyota Camry 2005-Brake pads noise problem
The rear brakes should last from 30000 to 60000 miles or 50000 to 100000 kms. So something is wearing out your brakes too fast. Are you doing the work or some shop. I also assume you have discs and not drums since you mention pads and calipers. I am not certain but usually you need a tool to turn the pistion in when putting in new pads. I would make sure the pads are releasing properly by raising rear of car, stepping on brakes a few times (with engine off and try see if wheels are free by spinning by hand, also try to use handbrake a few times and release it and see if wheels spin freely. Maybe rears always applied. Notice burning smell, are discs glazed from heat? Are you using really cheap pads. Also check the proportioning valve which will decrease pressure to rear brakes during hard braking. Do you notice rear wheels squeling during hard braking. Do you have antilock brake system? Also are you using good quality pads and rotors.
SOURCE: loud grinding noise; new brakes and new tires
some of the brake material used will make that sound on toyota's and lexus.you need to try a differant type of brake pad.should help.
SOURCE: ABS alarming after I replaced rear brakes shims, bled brakes etc.
try rebleeding the brakes. any air whatsoever will set off the abs light sometimes it takes a few times to get it all out even though they feel good. also make sure the fluid is full that will also set off the light.
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