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2004 Corolla Automatic, A few questions about Front Brake Pad Change

4K views 4 replies 3 participants last post by  MasterTecInSTL  
#1 ·
This was my first ever attempt to do brakes and I feel quite happy that I was able to do it all by myself with help from this site and youtube. I do have few questions about few things I noticed.

Corolla has 90.6K miles on it and these were still the original brake pads. I bought Duralast Gold CMax Ceramic ($49.99) pads from Autozone, which only came with grease (no other hardware). Here are few things I noticed and need your help:

1: Brake Pad Shims
The original brake pads were made of semi-metal and had two shims on them. Duralast pads seemed like already have built-in shim (black color with logo printed on it). I didn't try to remove it from the pad and just applied little grease on the top and installed it. I didn't install the two shims on the new pad.

Question: Was I suppose to install the two original shims on the new pad?

2: Pad Wear Sensor
I had also downloaded Brake Change section from Chilton Repair Manual from my local library Auto database. In the brake component diagram, it shows two brake pad wear sensors, one on each pad. My car had only one sensor per wheel and it was on the inner brake pad. Since I didn't have any extra or new ones to install, I just installed the two back on.

Question: Do I need to buy more and install one on each pad? Why did car had only one when diagram shows two?

Also about two months ago, it was driver side wheel that started making pad wear sensor noise. So sensor must have worn out some. Since I didn't have any new sensor, I just installed the old sensor back on.

Question: This may sound silly, but I am going to ask anyway. Is there any danger in installing the old (little worn out) sensor back on?

3.Passenger side Rotor
When I changed the driver side brake pads the rotor seemed fixed in place and unmovable. However, when I changed the passenger side brake pads rotor was loose, meaning I could move it by hand back and forward (on y-axis). And actually even on x-axis as space allowed within the caliper mount. That seemed odd to me, but I didn't do anything else other than to remove the tire and caliper nut. So, I just installed the new pads and put the tire back on.

Question: Is there something else that is loose or missing with rotor? Is rotor suppose to be loose like that? Why was one side fixed and one side loose?

4.Brake Pad Wear
Driver side inner pad seemed to have worn out more than the outer pad. Whereas on the passenger side both pads seem to have worn out evenly. Rotors looked fine to me and my car didn't give me shaky steering wheel when braking with old pads (at freeway speeds). So, I thought I don't need to machine them.

Question: What could be the reason and is there anything I need to do?

5. Brake Pedal Feel
After the brake pad change I drove the car around the block and it seems to brake fine but it seems like I have to press the pedal little more. I am not sure how to describe it but it feels little different. I did pump the brake pedal 4-5 times after changing pads and brake oil (still original oil) seems to be at good level.

Question: Is there something that I missed or need to do another adjustment to make it feel little more tight? Can you give me any tips on bedding-in brake pads?

If my questions seem little silly or from newbie and inexperienced person, please excuse me for that. This is my attempt and honestly I feel quite good for what I have accomplished. I would greatly appreciate your answers and thank you for your time.
 
#2 ·
See below for reference

http://www.toyotanation.com/forum/132-9th-generation-2003-2008/399511-diy-front-brake-job-pics.html

1. OEM shims are far superior to the Duralast and aftermarket garbage. I always reuse Toyota shims or buy new Toyota shims if I don't have any.

2. There is one sensor per wheel located on the inboard (piston side) pad. If it isn't ridiculously worn then you can reuse them. I always do unless they are completely destroyed.

3. Rust build up caused the rotor to stick. Almost always the rotor is seized to the hub. In the above DIY you will see at times you need to hammer off the rotor. I apply a light layer of anti-seize to avoid this sticking.

4. Either your slide pins or your caliper is sticking. The former is much more likely. Make sure you lube and cycle both the slides with a proper slide lubricant as in the DIY.

5. Could be the pads or the fact that they feel the same and your expectation has changed. Flushing the brake fluid is a good idea an should be done every 3 years at minimum. Do a flush and see if it helps.

Hope this helps.
 
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#3 ·
1> Technically you're supposed to use the shims that come installed on the new pads (and not reuse the original shims). If you do choose to reuse the original shims then you need to remove the shims on the new pads. Regardless, there is no danger with either decision (or even using no shims at all) - however you may notice excessive brake squeak. If they aren't making noise don't worry about it.

2> What hardtopte said.

3> Theoretically both rotors should be loose (they get clamped in place between the wheel and the hub) however sometimes corrosion builds up and makes them feel solid. If you were to whack it with a hammer it would likely break loose.

4> Again what hardtopte said. I recommend the clear silicone lube - or dielectric grease. The black stuff (and especially regular grease) can cause the rubber boots to swell up and leak.

5> Some decreased braking power is normal until the pads have a chance to wear into the rotor's surface. Considering they weren't machined they don't have a perfectly smooth finish. It will take a little time (50-100 miles or so) but eventually the pads will work just as well as the originals. A clean/adjust of the rear brakes can make a huge difference as well.
 
#4 ·
I see what you recommend for slide pin grease, but I was wondering is it possible to use the grease that came with the pads or must I go buy the one you recommend.

I won't be able to work on the car this weekend but hopefully next weekend will still be OK. Thanks for your help.
 
#5 ·
The black stuff that comes with the pads is great for lubing the contact points where the pads actually mount into the caliper bracket however you're best off not using it in the presence of rubber.

White lithium grease is also not a good idea as it can dry "hard" and make things freeze up after awhile.

You don't need a lot.. just pull the pins out and wipe them off. If there is rust inside you can use a drill bit (using your hand, not a drill) and brake cleaner spray to clean out the bores then apply fresh grease and reinstall the pins. If the rubber boots are torn, swelled or otherwise damaged just replace them.

You don't need a whole lot of grease.. two of the little 99c packets (probably even one if you're careful) should suffice. Get the dielectric grease or "connector protector" stuff.

Personally I use a product called "Sil-Glyde" which is just like dielectric grease except a bit "thinner" but it tends to be quite a bit more expensive. And a $15 tube of it will be way more than you'll ever use.