XK8 / XKR ( X100 ) 1996 - 2006
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Front Brakes on 2001 XKR

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  #21  
Old 06-14-2010, 02:07 AM
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Originally Posted by creativebush
I saw a thread on removing the ABS control module and opening it up to repair the solder joint. It looked a little involved though.
I had this done at an independent Jag shop for $300 and it took care of my ABS/Traction control messages.
 
  #22  
Old 06-14-2010, 03:21 PM
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cbrush, impressive job on the module. Trust me, after that, doing the brakes is a peace of cake. It really is very easy if you have all the parts.
 
  #23  
Old 06-16-2010, 02:16 PM
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Thanks to everyone for the words of encouragement but I found a local independent Jag specialist that will install the brakes I buy for $105 bucks. So I wimped out and am having him do the front brake install.
 
  #24  
Old 06-16-2010, 02:47 PM
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and rotors???
 
  #25  
Old 06-16-2010, 07:32 PM
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Yeah... make sure you replace those rotors, too. They looked pretty worn.

Actually, $105 for labor isn't bad for the brakes. I tried to change the brakes on my wife's Mazda, and she had a lip around the outer edge of the rotor similar to yours, but not quite as bad. I had a heluva time getting the calipers off. I got one done, but I made her take it to the shop for the second one.
 
  #26  
Old 06-16-2010, 11:27 PM
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Yeah sorry, I should have said pads and rotors. Sounded like a good deal to me
 
  #27  
Old 06-16-2010, 11:31 PM
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Originally Posted by Reverend Sam
I tried to change the brakes on my wife's Mazda, and she had a lip around the outer edge of the rotor similar to yours, but not quite as bad. I had a heluva time getting the calipers off. I got one done, but I made her take it to the shop for the second one.
The caliper needs to be opened up to clear the lip on the rotor, and probably to fit the new pads and rotor. I've found that the easiest and safest way to do this is to open the bleeder screw and depress the caliper piston.

Put a plastic tube on the bleeder screw, the other end into a container to catch the fluid. Then open up the bleeder screw while pulling the sliding caliper against the rotor to depress the piston and push some fluid out, enough so that the pads clear the lip on the rotor. Close the bleeder.

After the new brakes are in, and pumped a few times, check the fluid level of course.

Dan
 
  #28  
Old 06-16-2010, 11:36 PM
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^perfectly clear instructions...too bad the mechanic is going to do it his way, and probably just push it back into the system
 
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Old 06-16-2010, 11:37 PM
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Originally Posted by h20boy
beating the rotor to come off the hub (if she's really rusted on) Same with the caliper bracket bolts, first time I broke 'em loose, they were really on there. Rubber mallet and a wrench, your best friends. Install is much easier.

Before raising the car or removing the wheels, loosen all the lug nuts so they are just finger snug. Drive a few feet forward and hit the brakes. Then drive a few feet back and hit the brakes.

Then go ahead with the brake job. The rotors won't be stuck on the hub.

Dan
 
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  #30  
Old 06-16-2010, 11:42 PM
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^ and the tips just keep on coming! lol
 
  #31  
Old 06-16-2010, 11:43 PM
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Originally Posted by h20boy
^perfectly clear instructions...too bad the mechanic is going to do it his way, and probably just push it back into the system

Exactly, that's what I was alluding to when I said "safest". The fluid that came out of mine looked pretty bad (I did a flush not long after). I imagine it's pretty risky to push that goo backwards into the abs pump. Not cheap that.

Dan
 
  #32  
Old 06-16-2010, 11:45 PM
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Originally Posted by h20boy
^ and the tips just keep on coming! lol

I'm full of them ... er ... full of it ... umm ... oh heavens sake never mind.
 
  #33  
Old 06-17-2010, 08:31 AM
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Originally Posted by MrTexasDan
The caliper needs to be opened up to clear the lip on the rotor, and probably to fit the new pads and rotor. I've found that the easiest and safest way to do this is to open the bleeder screw and depress the caliper piston.
Dan
On my wife's brakes I tried that but it just wouldn't work. Even after I got the caliper completely off I couldn't get the piston to go back into the caliper. I had the bleeder screw wide open, the brake line was completely off of the caliper, and with a C-clamp pushing on the piston it wouldn't move back into the caliper. I finally got it to go back in by HAMMERING on it. It would move a tenth of a millimeter with each hammer blow. It was almost like there was a check-valve in the caliper that prevented it from allowing the piston back in. Anyway, I eventually got it done, but It took hours and I made her take it to the shop to get the second one done.

Originally Posted by MrTexasDan
Before raising the car or removing the wheels, loosen all the lug nuts so they are just finger snug. Drive a few feet forward and hit the brakes. Then drive a few feet back and hit the brakes.

Then go ahead with the brake job. The rotors won't be stuck on the hub.

Dan
Are the rotors held on only by the lug nuts, or is something else holding them on, too? I ask because on other brake jobs I've done the rotors came right off once I had the wheel off. When I had my XK8 calipers off the other day the rotors seemed to still be attached solidly.
 
  #34  
Old 06-17-2010, 11:37 AM
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Originally Posted by Reverend Sam
I finally got it to go back in by HAMMERING on it. It would move a tenth of a millimeter with each hammer blow. It was almost like there was a check-valve in the caliper that prevented it from allowing the piston back in..
Hmm, there is nothing in the standard calipers thet keeps the piston from depressing (not sure about the Brembos). Having to hammer (!) on it suggests maybe corrosion in the caliper piston/cylinder.



Originally Posted by Reverend Sam
Are the rotors held on only by the lug nuts, or is something else holding them on, too?

The rotors are sandwiched between the hub and the wheel ... so yes they are held in by the lug nuts ... and rust (except in Texas :-), which is why the procedure I posted to break them free works.

Dan
 
  #35  
Old 06-17-2010, 05:40 PM
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Now I'm really glad I'm having someone else do it :-)
 
  #36  
Old 06-17-2010, 06:11 PM
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Originally Posted by creativebush
Beauregard, thanks again for your assistance! This is good to know.



I questioned them on it when they quoted the $1700 I mentioned they didn't look fancy like other Brembo brakes I had seen and he said I definitely had the dual piston Brembo brakes... hmmm...



Yep, I agree. Definitely need pads and rotors.



Thanks Dan for pointing out something identifying that I can question the dealer on. I really appreciate the input. This may sound like a stupid question but how would I go about matching the pads on the rear?



Hey Matt, I agree on the rotors and while it would be cool to have the Brembo brakes I have to admit that frankly it's a relief I don't and I have options! Thanks for the feedback and it looks like you got promoted around here since I visited last. Nice work.

Thank you all you've been extremely helpful, I'm getting all teary-eyed :-)
There are no stupid questions. Well maybe some!

The pads would be matched when the same brand and type of pad is on the front and rear. Different pad formulations have different friction characteristics. With the same pad brand these characteristics are "balanced" front and rear.
 
  #37  
Old 06-27-2010, 07:52 PM
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Originally Posted by creativebush
I don't know if it's fixed yet but special thanks go to Gus for pointing out this fine tutorial by Dan Jensen:

http://www.jag-lovers.org/snaps/snap...?id=1230845126

Here's what I've done thus far:

Successfully removed the control unit


Control Unit Opened


Sure enough, broken solder joints


Repaired solder joints - I hope


Getting ready to apply RTV and close up unit


Now I'm just waiting for the RTV to cure before I put it back into my car.

Given that I did have broken solder joints I'm relatively confident this will fix my ABS/Traction Control/Stability Control Unavailable issue. I have my fingers crossed!
You did a great job on this post! Kudos to you!
 
  #38  
Old 08-30-2010, 08:35 PM
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Alright!

My turn to do some surgery!

I've tried to clean the sensors, and although they were dirty, my lights are still on.

I've read the links, and thread here, and think I'm good.

.......
 
  #39  
Old 08-30-2010, 10:23 PM
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I think I hear the cracking of plastic...
 
  #40  
Old 08-31-2010, 09:20 AM
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Even after I got the caliper completely off I couldn't get the piston to go back into the caliper. I had the bleeder screw wide open, the brake line was completely off of the caliper, and with a C-clamp pushing on the piston it wouldn't move back into the caliper. I finally got it to go back in by HAMMERING on it. It would move a tenth of a millimeter with each hammer blow. It was almost like there was a check-valve in the caliper that prevented it from allowing the piston back in.
I did a brake job once that was quite similar. After I was done and ruined the caliper, I found that the piston actually screwed back into the caliper. Maybe it was of this style.

They can also get scored to the cylinder wall leaving a ridge and that will sometimes prevent them from being pushed back too, but that was usually with older vehicles.
 


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