bilbo
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| posted on 4/12/09 at 05:10 PM |
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Tin Top slow speed braking weirdness
The tin top seems to have developed a strange braking/abs issue. It only happens at slow speed (5-10 mph) and only when you turn left and brake at the
same time (it's fine turning right and at speed). What it feels like is happening is the ABS seems to trigger and go into overdrive – you can
really feel the brake pedal vibrate like you're on black ice.
I'm thinking it may be a wheel sensor or something (I'll whip the wheels off tomorrow and have a look)? Anyone got any other ideas to
check? It's a Jag S-type.
Thanks,
Bill
[Edited on 4/12/09 by bilbo]
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Build Diary: http://bills-locost.blogspot.com/
Web Site: http://locost.atspace.com
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woolly
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| posted on 4/12/09 at 05:39 PM |
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probably your first thought also loose wire or plug
woolly
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britishtrident
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| posted on 4/12/09 at 06:08 PM |
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Usually effects like this are down to cracked ABS reluctor rings on the one of the front wheels. If it is shrunk on toothed ring a visual inspection
will show it up.
Most cheaper cars have toothed rings shrunk on the the cv joints water gets in between the ring and the cv joint rust forms and ring splits,
usually more expensive cars built in the last 10 years have a more reliable system the rings built into the wheel bearing unit.
Replacements rings are available for a lot of cars but I don't know about the Jag.
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DRC INDY 7
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| posted on 4/12/09 at 06:21 PM |
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Most cheaper cars have toothed rings shrunk on the the cv joints ?????
Why cheaper cars most cars have that/had that design even the £80,000 BMW 850i in its day
most have moved on to magnet type
But yes the pickup ring can crack and float on the cv joint
Looks like i own a expensive car now because that has magnetic pickup ring
[Edited on 12/4/2009 by DRC INDY 7]
https://www.facebook.com/groups/462610273778799/
Puddle Dodgers Club
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bilbo
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| posted on 4/12/09 at 06:53 PM |
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Thanks for the replies.
I suspected it would be something like this - I'll have a looksee.
Cheers,
Bill
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Build Diary: http://bills-locost.blogspot.com/
Web Site: http://locost.atspace.com
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minitici
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| posted on 4/12/09 at 07:15 PM |
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Another vote for a cracked reluctor ring.
I had both mine go on my Suzuki but I got a new pair.
Not too difficult to fit.
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dhutch
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| posted on 4/12/09 at 08:52 PM |
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Yeah ditto, had the same on 806.
- Very easy to find if its the case, i just said to dad 'it will be the abs ring' and stuck my head under. Yep, look... 3mm crack.
Daniel
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skodaman
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| posted on 4/12/09 at 09:16 PM |
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Check the brake discs as well. My last Mondeo did this at first but at any speed under braking cos previous owner didn't use it much and said
he never went above 40mph. Some heavy brake tests and a bit more use and it went away. Was presumably rust and crud on the discs.
Skodaman
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skodaman
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| posted on 4/12/09 at 09:16 PM |
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Check the brake discs as well. My last Mondeo did this at first but at any speed under braking cos previous owner didn't use it much and said
he never went above 40mph. Some heavy brake tests and a bit more use and it went away. Was presumably rust and crud on the discs.
Skodaman
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Danozeman
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| posted on 5/12/09 at 09:21 AM |
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l go for cracked or corroded ring aswell. I had a rover that did that. Fine above 10mph.
Dan
Built the purple peril!! Let the modifications begin!!
http://www.eastangliankitcars.co.uk
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bilbo
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| posted on 5/12/09 at 11:48 AM |
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OK, so I've had a look. No CV joints on the front, of course, as it's RWD. It has sealed sensor units integral to the hubs/uprights.
Checked all the plugs, everything OK. What's interesting is the design of how the cable is connected to the sensors differs between driver and
passenger side, which makes me suspect one of them has been replaced in the past? So, probably, the fix is the other will need replacing. Also looked
at the rear, but can't see the reluctor rings. However, there is no sign of corrosion anywhere.
I then thought I'd take it out round some back roads to put some heat in the brakes, see if it clears any crud? Trouble is all this did was make
the computer catch up with the fact there is a problem. It's decided to flash lots of error messages and disable the ABS and the DSC! Great in a
way, as the problem has gone away (no ABS), but clearly I need to take it to the independent Jag specialists I know to get it looked at properly (and
to reset the computer).
Looking on the bright side, driving back was great fun without the driver aids and 285 bhp to the rear wheels on a wet road and no LSD  
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Build Diary: http://bills-locost.blogspot.com/
Web Site: http://locost.atspace.com
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