Author Topic: Brake noise/slight juddering  (Read 1754 times)

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Offline beastboy

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Brake noise/slight juddering
« on: December 16, 2017, 10:31:42 AM »
1997 2.5 V6.
I have had all the calipers off to fit various pads and discs. I have replaced the corroded pipe from the top of the ABS box to the front offside caliper.
I bled all 4 corners by gravity, and when the prob' started I also bled with a pressure bleeder.
Ocasionally when braking at low speed I get a slight judder and growling noise felt through the pedal. Seems to be at slow speed.

Is it an ABS bleeding problem?

Thanks

Offline TURBOHEAD

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Re: Brake noise/slight juddering
« Reply #1 on: December 16, 2017, 11:49:32 AM »
Hi and welcome

First did you introduce yourself on the new members panel called "Newbies". If not go to it and tell us more about yourself and your Calibra  :)

Sorry if I ask an obvious question......but when you fitted the brake pads......did you clean any rust along the pad guides where the pads move in and out........reason is the pads can snag and not slide smoothly.

Also it is important to rub copper grease or similar on the back of the pads which come into contact with the calliper pistons.......if you haven't this will cause brake squeal and noise etc......which could be your problem solved.

Finally make sure the anti rattle springs are mounted correctly and that the ends are correctly located in the retaining holes.

It is also possible that the piston are not sliding smoothly in there bores and may need a clean and service.

Offline zodiac245

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Re: Brake noise/slight juddering
« Reply #2 on: December 17, 2017, 10:58:19 AM »
Check the ABS rings on the front. Corrosion or cracks cause these symptoms...

Offline beastboy

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Re: Brake noise/slight juddering
« Reply #3 on: December 17, 2017, 22:43:53 PM »
Thanks for responses.

In response to the welcome form Turbohead, I don't profess to be very comp literate so I may have not done something which I should, but I have been about for years, but am a very intermitant user.

The noise is defo not a squeal, but more a grumble

I will try cleaning up all the ABS rings first, and then go onto the possible sticky caliper/pad. I'll check pad retaining springs as well.

When I fitted the pads I did use what I thought was the right amount of copper grease.  Particulay on the rear where I had the stuck one.  I even ensured the edges of the new rear pads and inside the caliper where the pads should slide where nice and flat
I had a stuck piston on the o/s/r which I free'd off and ensure it moved in and out.  There may be a ridge on it or something like that as I don't know how long it was stuck. That will be the next starting point after the rings.
If that don't work I'll have a look at all the others.

Just had a thought, I had a mate in a garage do all 4 cv boots as I had 2 split on opposite sides.  Could you get this symptom if the wheel bearing were maybe not tight correctly. The car drives fine otherwise.

Thanks again.

Offline TURBOHEAD

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Re: Brake noise/slight juddering
« Reply #4 on: December 18, 2017, 23:24:09 PM »
Hi beastboy

Sorry if I mistook you for a newbie........I didn't mean to cause you embarrassment .......it should have been....Welcom back  :)

Worn or damaged lower suspension components can also cause noise....especially ball joints.

Regarding the ABS reluctor rings.......I had this problem where the sensor had come adrift from the bracket and was fouling on the reluctor ring
this created a loud grating noise.......I had to replace the sensor.

Hope the above will help.

Offline zodiac245

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Re: Brake noise/slight juddering
« Reply #5 on: December 19, 2017, 22:32:23 PM »
I will try cleaning up all the ABS rings first, and then go onto the possible sticky caliper/pad. I'll check pad retaining springs as well.

Mine made a graunching noise and I found a crack in one ABS ring...

Offline beastboy

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Re: Brake noise/slight juddering
« Reply #6 on: December 20, 2017, 23:01:12 PM »
On Monday I drove 40 miles with no issue.  Then as I got near home it happened when slowing in town for a set of lights. So I thought I'd check out the rear wheel that had the sticky piston first.

Noticed the clean/used part of the disc was smaller then the other side. So I thought that I'd clean up the unused rusty parts on the inside and out, to match the size of the new pad.  Made it a lot worse!!!!!

So I've ordered a new pair of rear discs as I think I need to bring it back to original spec before spending time elsewhere.  Hopefully I 'll get that done this weekend then let you know how it is.
Cheers


Offline beastboy

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Re: Brake noise/slight juddering
« Reply #7 on: December 28, 2017, 11:19:04 AM »
Hav been sent wrong size discs!!!!

Offline tristandimond

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Re: Brake noise/slight juddering
« Reply #8 on: December 30, 2017, 00:41:00 AM »
Hmm that's always annoying!  >:(
Did you get them off ebay? Or from a motor factor?
1998 Cally 16v SE8 (daily)
1997 Cally V6 (project)
1999 Jaguar XJR 4.0 V8 Supercharged (Toy)

Offline beastboy

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Re: Brake noise/slight juddering
« Reply #9 on: January 03, 2018, 16:18:33 PM »
The wrong size disc were ebay. Put my reg in and it said theyll fit so jumped in before checking everything I should have.
Anyway I returned them no prob.
Hve fitted the correct pair and still the same.
Checked the front reluctor rings this morning. O/S 1 is cracked and one end is a bit loose so I would like to think this is the prob.

I beleive there is a how to on here somewhere so I will check it out.  Are 1997 V6 rings the same size and teeth as all the others?

Thanks for your help all.

I will report back if/when i get a complete result!!!!!!!

Offline zodiac245

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Re: Brake noise/slight juddering
« Reply #10 on: January 04, 2018, 18:55:29 PM »
On my 96 V6 they were different to the 4-cylinder models. I found I could only source rings for the 4 and had to buy complete CV joints for my car. As one was clicking intermittently on occasional slow corners they needed doing sometime anyway...

Offline beastboy

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Re: Brake noise/slight juddering
« Reply #11 on: January 05, 2018, 11:24:37 AM »
Sh-t.  That's not what I wanted to hear. I have already ordered one from J and R CVJoints. Only £2.25.
I'll get the old one off and maybe measure it up.  Take it from there.
Thanks Zod.

Offline zodiac245

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Re: Brake noise/slight juddering
« Reply #12 on: January 07, 2018, 11:06:45 AM »
Sh-t.  That's not what I wanted to hear. I have already ordered one from J and R CVJoints. Only £2.25.
I'll get the old one off and maybe measure it up.  Take it from there.
Thanks Zod.


Remember the number of segments on the rings must be equal or the ABS will get confused!

Offline beastboy

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Re: Brake noise/slight juddering
« Reply #13 on: January 08, 2018, 13:17:41 PM »
Ta for that. Will check against the old one.  Hopefully do this week.

Cheers

Offline beastboy

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Re: Brake noise/slight juddering
« Reply #14 on: January 11, 2018, 11:35:12 AM »
The n/s front CV reluctor ring was in very good condition.  The o/s front was in very poor condition and had cracked.  I reckon this had cracked because of rust building up underneath it, and when getting hammered to split the ball joint to do the cv boots, it had cracked open.  So decide to put a new cv joint on instead as the condition indicated it had done a lot of miles.

Car works/brakes fine.  Thanks to all for your help.

The cv joint I removed had 29 teeth.  So did the new one.  So as soon as I get the time I will split the ring off the old one and fit the new one so I can report back where I got it and its item no, so others can use that info if they need,

Thanks again.