ABS but front wheel locks up

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RichardW
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Re: ABS but front wheel locks up

Post by RichardW »

Don't think you need to worry about the ABS on test, Chris - as long as the light goes out you will be OK. Rolling speed of the brake tester is so low that ABS will not normally activate anyway, and the car will slip on the rollers.

Need to get it sorted though, otherwise it might lead to some interesting moments under heavy braking! Lexia should report the wheel speeds, and the status of the electrovalves - which should show it trying to release the pressure at the locked wheel - although I'm surprised it doesn't flag a fault if the wheel is locked, but it's trying to get it to rotate again!
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Re: ABS but front wheel locks up

Post by c.morewood »

I'm with you on that Richard..ABS is a neccessity up here in the winter and I don't like the idea of driving round and it not beinga available just now.. so I'll look forward to Pauls parts arriving and getting it servisable again.
After a lot of hunting on the web.. I finally found some of the figures I was looking for
Braking Efficiency Table
http://www.motuk.co.uk/manual_3100.htm" onclick="window.open(this.href);return false;
Basically at least 50% foot brake and 15% for the hand brake will pass.
And had a chat with the tester this afternoon.. nice chap, but hadn't tested a Xantia before, I explained the workings of the brake pedal and the fact that the Xantis brake is an on off with very little movement and he accepted the explanation and agreed that the note at 3.3.A 5
"Note: This does not apply to power operated braking systems, providing the foot valve is fully open before the pedal is fully depressed."
applied to the Xantia.
As I was driving to see him I was holding the handbrake on and off against the power of the engine making sure the brakes were well and truly bedded in and just before arriving at the garage,on a quiet country road, I managed to get the o/s wheel to lock before the n/s.. so hopefully she'll pass tomorrow.
Chris
Tesla Model 3 LR DM AWD Blue White
'00 Xant 110HdiSX Est 83K "W"
'99 Xant 110HdiSX Est 320K "V"
'98 Xant 1.9TDSX Est 150K "T"
'97 Xant 1.9TD 20k Est
'94 Fiat TipoTd 40K

'85 BMW K100RT 330K Garaged 26yrs '80 Honda CB250 twin Superdream
c.morewood
Donor 2023
Posts: 1041
Joined: 05 Nov 2004, 14:38
Location: Kemnay, Nr Aberdeen, United Kingdom
My Cars: '00 Xantia 110 bhp Hdi SX Estate 65K "W"
'99 Xantia 110 bhp Hdi SX Estate 310K SORN "V"
'98 Xantia 1.9TD SX Estate 150K Sold "T"
x 47

Re: ABS but front wheel locks up

Post by c.morewood »

Update.
Passed, but only with two of us and 4 concrete blocks in the back... and tyre pressures adjusted down from the 2.6 I run them at to 2.3.
I'm now composing a little note to myself to remind me for next year.

:-)
Thanks for all the advice
Chris
Tesla Model 3 LR DM AWD Blue White
'00 Xant 110HdiSX Est 83K "W"
'99 Xant 110HdiSX Est 320K "V"
'98 Xant 1.9TDSX Est 150K "T"
'97 Xant 1.9TD 20k Est
'94 Fiat TipoTd 40K

'85 BMW K100RT 330K Garaged 26yrs '80 Honda CB250 twin Superdream
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Re: ABS but front wheel locks up

Post by citroenxm »

Chris.. give me a reminder monday to get the abs thing for you. Is that an s1 to 1997 P reg too??
Sharing a pug 207 1.6 hdi Sw 16v.
M reg Xm 2.1 td auto exclusive S2 269k and rising
L reg XM V6 12v SEi auto .. Light project

A very sad...
1994 XM 2.1 d auto
c.morewood
Donor 2023
Posts: 1041
Joined: 05 Nov 2004, 14:38
Location: Kemnay, Nr Aberdeen, United Kingdom
My Cars: '00 Xantia 110 bhp Hdi SX Estate 65K "W"
'99 Xantia 110 bhp Hdi SX Estate 310K SORN "V"
'98 Xantia 1.9TD SX Estate 150K Sold "T"
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Re: ABS but front wheel locks up

Post by c.morewood »

Ok Thanks Paul, No its a S2 V reg '99 Xantia 110 bhp Hdi SX estate
Chris
Tesla Model 3 LR DM AWD Blue White
'00 Xant 110HdiSX Est 83K "W"
'99 Xant 110HdiSX Est 320K "V"
'98 Xant 1.9TDSX Est 150K "T"
'97 Xant 1.9TD 20k Est
'94 Fiat TipoTd 40K

'85 BMW K100RT 330K Garaged 26yrs '80 Honda CB250 twin Superdream
citroenxm
Posts: 8061
Joined: 30 Dec 2004, 23:10
Location: Somewhere in North Wales, Anglesey
My Cars: M reg Xm S2 2.1td Auto Exclusive. 269k and rising
L reg XM S1 V6 12v Manual SEi
L 94 XM 2.1 TD auto total resto

2008 Peugeot 207 Sw 1.6 16v hdi. 217k and rising
2010 Peugeot 207 SW 1.6 8v HDi 161k and rising
x 70

Re: ABS but front wheel locks up

Post by citroenxm »

Ahh ok.. thats even more unuseual.. thats why ill send one to you to try first..

Im not sure how the S2s come apart..

Anyway.. ill sort that next week for you..
Sharing a pug 207 1.6 hdi Sw 16v.
M reg Xm 2.1 td auto exclusive S2 269k and rising
L reg XM V6 12v SEi auto .. Light project

A very sad...
1994 XM 2.1 d auto
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