E30 BMW Brake Job

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JHZR2

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I finished my brake job and bedded in the pads, which stop nicely and work great. I took them out and got them good and hot. Hot enough that my lug bots were hot to the touch. The job was a bit of a pain because I was a bit ill prepared, and AAP wasnt the best either. But the job was done, hopefully right in the end.

I had done the brakes last about 10 years and 80k miles ago. As youll see later, the pads had plenty of meat. I was experiencing an intermittent steering wheel shake when I hit the brake. Didnt happen all the time, which was odd, and I found that the whole front end was solid - no bad ball joints or anything. So the brakes it was. One was sticking.

I went with Bendix CT-3 because I like those pads in other applications, and they were $18 from Amazon. I figured that if they were bad, I could always swap them. I think Ill keep them... I also used new Bendix rotors.

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So I had originally planned to just swap pads and rotors, but after thinking about it a bit, I realized that I use this car for a lot of driving for work, and the pads and rotors could go another 10 years (though Ill not likely have the car that long due to rust). So I figured it was smart to change the calipers and brake lines too (turned out one side was by necessity anyway...).

Of course folks know my deal about that from my thread about AAP. They sold Fenco rebuilt calipers, which I have to say so far (knock on wood) Ive been happy with. A number of odd inconsistencies such as that one was missing a bracket (QA issue), one was not built, and another was delivered built with greased slide pins and boots. Go figure. The one that came set up I took apart to service myself. They were painted and coated with some sort of lacquer or corrosion preventative. All the threads for the brake lines and bolts were all coated as well and looked perfect. I didnt pay much attention on the first one, but the second one had a very nicely machined piston surface. We will see how they do in the long run, but surely better than a semi-seized one.

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Pulled the first rotor after the issue with the set screw.

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The first (left) rotor was decent in terms of shape. In my earlier years I got Zimmerman cross-drilled rotors just because I thought they looked "cool". I looked for evidence of cracking and saw none. This side had very clean holes too. The other side with the semi-seized caliper was a different story.

The first rotor:

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The other side wasnt so good...

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The old pads tell the tale of what happened. The pad on the side with the bad caliper was a little low, but the other side had plenty of pad. Not bad at all given the age and mileage, and given that I drive this car a TON in city and stop and go traffic between DC, NJ, PA and NY. Lots of use of the brakes. Then again I try to drive very gently and the car is light.

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These pads were Pagid brand:

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And I dont think they had attached shims. I used the CRC red goo generously, and it held the pads, held up and did its job - never any noise from these pads at all.

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So putting it all back together, I cleaned the hubs. One side is original:

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The other side is pretty new because the bearing got noisy and I had it replaced. Im a bit worried about it though... There is some blue discoloration at the point where the hub goes from vertical to horizontal. Is that typical or a sign of heat issues? Keep in mind this is the side with the bad caliper (related???), but is this a sign of an overly tight bearing? Tough to see but you can kind of make it out in the pic. FWIW, he car rolls and drives wonderfully and quietly. The bearing was done maybe 10 or 15k ago.

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Coated the hubs with copper antiseize and attached the rotors with new set screws:

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Then to prepping the calipers. For the sliders I used 3M silicone paste #08946 from NAPA. I have sil glyde, but after learning that it is far from 100% silicone (FBOW) I went with the 3M. I put some on the pins and in the boot, and also some in the hole in the bracket. It took some burping to get all the air out, not sure if that is important or not.

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Maybe it's stupid but I used threadlocker red on the caliper braket bolts... And torqued them to 80 ft-lb per the manual. Then I went about installing the pads and the calipers (which I swapped with new hoses). The BMW FSM recommends ATE Plastilub, which I didnt have, and didnt want to go to the dealer to get (I ended up at the dealer later for a wear sensor but that's another story). ATE Plastilub is a mineral oil grease in bentonite. I posted the question about bentonite, which is a silicate, vs other silicate materials used in pure silicone greases. Havent seen answers on that yet... But anyway, I didnt have the ATE stuff at the time, and the CRC SilAramic seemed like a good option because it was pure silicone with some ceramic solids. I used this instead of the 3M stuff applied only on the points on the bracket where the pad edge touches, the piston touching edge, and the caliper "fingers" where they would touch the pad. Per the FSM, none is to go on the pad back itself, so I didnt. I just wiped some on by hand.

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After that, bled the brakes just by the pedal method with my wife pushing the pedal down, then put anti-seize on the rotor hat faces where the wheel mates, mounted the wheel, let the car down, torqued the wheels and went to bed them in.

I tried to do the bedding procedures I read online. It was easy to bed via lots of 20 or 30-0 stops with no stationary time at all. However the high speed stops were tougher because the roads are pretty busy around me. I made a compromise by doing some stops from higher speed, but also some driving with some pressure on the pedal, while on the throttle as well. Not for long, but I figured that added some heat.

When I stopped the car, the rotors were too hot to touch, and the lugnuts were very hot to the touch as well. Just a faint smell of burning brakes though. Drove a while to let things cool, and I was happy with the performance.

Hopefully I didnt mess anything up, but assuming not, Im happy with the CT-3 pads and Bendix rotors on this car. Only time will tell for sure though.
 
I thank you for using 3M Silicone Paste. IMO, possibly one of the best known secrets for servicing brakes. Perhaps that's why the parts stores push the little packets of cr@pola lube at the register (to get you to do brakes in 8 months). Ever since I learned about a few years ago, it has been all I have used. I tell people about it and they also spread the word. I have not have a siezed slide since.
 
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Looks nice. I always like a "complete" brake job. But I might have used blue loctite versus the red. You might have to heat the bolts a bit to remove them so don't forget you used it. I have to try the 3m goo since my permatex is almost used up.
 
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Nice job. Bendix is not on my list of high quality brake pads. But that does not mean a whole lot as I am only a shadetree.

I am somewhat convinced that if I use Akebono Pro-Act or Wagner Thermoquiet ceramic that I will get about the best brake job I can and no bedding is needed.

There are lots of brake pads out there, I will never try most as I only have 2 vehicles and am 60 yr old. So I have found two I think are excellent, and other BITOG posts seem to agree, so I stay with what works for me.

If Bendix works for you, then great.
 
Originally Posted By: Doog
Looks nice. I always like a "complete" brake job. But I might have used blue loctite versus the red. You might have to heat the bolts a bit to remove them so don't forget you used it. I have to try the 3m goo since my permatex is almost used up.


I used blue on the bolts that held the caliper to the slide pins. Yeah red may not have been smart... Oh well.
 
Originally Posted By: redhat
I thank you for using 3M Silicone Paste. IMO, possibly one of the best known secrets for servicing brakes. Perhaps that's why the parts stores push the little packets of cr@pola lube at the register (to get you to do brakes in 8 months). Ever since I learned about a few years ago, it has been all I have used. I tell people about it and they also spread the word. I have not have a siezed slide since.


What do they use when you buy a quality reman caliper to lubricate it at the reman factory?

I see two 3M Brake Lube products and two 3M Silicone Paste on Amazon.

Which are you suggesting is the one that beats silglide?
 
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Originally Posted By: Donald


What do they use when you buy a quality reman caliper to lubricate it at the reman factory?

I see two 3M Brake Lube products and two 3M Silicone Paste on Amazon.

Which are you suggesting is the one that beats silglide?


The two calipers I got had one assembled and one unassembled. I didnt like the feel/look of he lube in the assembled one. It was kind of chunky, and more amber colored than the 3M stuff.

It wasnt antiseize or one of the petroleum products... It may have been plastilub, no idea... Or sil glyde!

Regardless, I removed it because the 3M product flowed and looked a lot better on the pins.

Sil Glyde may be good stuff, but it is castor oil and other things, with just a little silicone oil/silicone in it. This is why I chose the 3M stuff.
 
Originally Posted By: Donald

What do they use when you buy a quality reman caliper to lubricate it at the reman factory?

I see two 3M Brake Lube products and two 3M Silicone Paste on Amazon.

Which are you suggesting is the one that beats silglide?


I just searched Amazon and the first two silicone paste results are both 3M products, this is the same you came up with? Both of those are the same product. I most recently bought a bottle of the 3M paste with the black and blue label. Just newer packaging is all.

On my most recent of calipers, it appeared to be Sil-Glyde or something real similar. But as JHZR2 mentioned, it didn't hold a candle to the 3M paste.

The other bottle of 3M product that touts 'Brake Lube' should also say anti-seize compound. It is typically a copper based anti-seize compound. I generally use this on the ears of my brake pads.

 
If your caliper was stuck I wouldn't be surprised if it is heating up that hub/bearing. If it spun freely and felt good with the rotor off, I would be inclined to think you're OK.

I have a friend whose Impala had a stick caliper. It made so much heat that the hub was blue in certain spots and the bearing was toast.
 
I know it,s sounds a bit crazy. And with normal driving I means nothing. But here and in several other European countries. It is forbidden to coat/paint the hub with coppergrease or other grease. The reason is you reduce the heat transfer capability from the roter to the hub, a good bit. You can actually fail an MOT if they see is( if you just changed the rotors before)

Personally I think it is a bit extreme.

But good to see a well made job. And good to see you had good experience with Zimmerman rotors. I am thinking of trying them with some brembo pads on my Mazda 6 soon.
 
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Great job. Great write-up and pictures. You used 10 times more paste than you needed. A simple coating on those bolts is all that is needed.
 
Originally Posted By: Oil Changer
Great job. Great write-up and pictures. You used 10 times more paste than you needed. A simple coating on those bolts is all that is needed.


Whoops! Hope it doesn't bite me in the long run... Should I pull the pins and remove some?
 
No. All its going to do is collect junk; you'll see. In the future just put a light film on. That can and tube you showed in the pictures should last a shade tree mechanic a lifetime and then be passed down.
 
I was surprised that what was left of the grease in the functioning sliders on the old calipers was clean and didnt seem to have picked up much outside grit/dirt. I guess the boot did its job...
 
I forgot to ask but why those drilled rotors look so bad from the other side? I am presuming they were NOT cheap.
 
Originally Posted By: Vikas
I forgot to ask but why those drilled rotors look so bad from the other side? I am presuming they were NOT cheap.


Well some of the reason why they look bad is because I let them get wet, then they surface rusted a bit, I dried them off, and it left a rusty smear on the surface.

But look at the pads... My right side rotor had a dragging caliper. You can see from the left side pads that after all that time and mileage, the pads had a TON of meat left. But the one on the dragging side was very thin.

So some rust that I tried to clean plus a dragging pad...

Note that the rotor with the dragging pad had LOTS of dust/dirt clogging the drilled holes, while the other rotor was very clean.

And despite the dragging pad, no cracks were noted on the rotor, so I suppose they designed them well.
 
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