XJS ( X27 ) 1975 - 1996 3.6 4.0 5.3 6.0

Rear inboard discs "damped"

 
  #1  
Old 06-09-2019, 09:41 AM
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Default Rear inboard discs "damped"

OK so after 12 or so years of my rear discs looking dodgy I am going to drop the subframe and change them. The part No for an 89 V12 is JLM 730 and the description is Disc Damped.

More common and cheaper are discs C26779 Disc.

What is the difference - if any and could I fit the cheaper ones without problem ? Anyone any experience of fitting the C2779 discs to an 89 or later car ?
 

Last edited by somethingsomewhere; 06-09-2019 at 10:10 AM.
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Old 06-09-2019, 10:00 AM
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I've always used the non-dampened brake discs. No problems at all

Cheers
DD
 
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Greg in France (06-14-2019)
  #3  
Old 06-09-2019, 10:19 PM
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Agreed.

1989 is way past the Dana rotor oddity, and anyway, now the rotors are multi fit, down here at least.

Never used Genuine, so in the dark there.
 
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Old 06-09-2019, 11:58 PM
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EBC makes performance vented and slotted rotors for the XJS, I have these on the front, couldn't order (at that time) the same for the rear. Consider vented rotors they'll last longer then a basic oem one.
 
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Old 06-10-2019, 01:38 AM
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Keep the updates coming, I am interested in how you get on.
I will need to do this one day.
cheers
 
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orangeblossom (06-10-2019)
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Old 06-10-2019, 03:41 AM
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Originally Posted by VancouverXJ6 View Post
EBC makes performance vented and slotted rotors for the XJS, I have these on the front, couldn't order (at that time) the same for the rear. Consider vented rotors they'll last longer then a basic oem one.
Vented on the front, standard.

Vented on the rear, NAH, too much work involved. Caliper spacer, reshaped bridge pipe, and then exhaust clearance issue for that bleed nipple that is just ":kissing" that over axle pipe now. Looked at it waaaaay back. Stayed standard, and things are just fine on ALL the Inboard braked cars. I dont track the car, never have, never will, peak hour stupidity is tough enough, so maybe thats the difference. Drive them HARD, hell yes, but stopping has never been an issue.

Longer life, doubt that seriously, they wear as designed, based on the pads that are chewing away at them.

The standard ear rotors in the XJ12 (Sir Arthur) were changed at 330000kms, and they were the OE sandwich style, and very sad. Car now has 600000++kms and the replacements are just fine. 3rd set of fronts now being consumed since the car was new.

My XJS, new all round at 130000kms, just because I had them, and the rear cradle was out for output shaft seals. Now at 300000kms, and all 4 are just fine.
 

Last edited by Grant Francis; 06-10-2019 at 03:42 AM. Reason: spelling seriously sucks
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Old 06-13-2019, 10:03 AM
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Improved damping serves to reduce brake squeal. So no big deal considering I've had no issues with my older style and the fitment is the same.
 
 
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