abs

**vcab1** · by **vcab1** » Fri Oct 10, 2008 7:13 pm

can some tell me if there is an easy way to find out if i need to replace
an abs sensor or the control unit.
the problem im having is : some times not all the time the abs light comes on, if i switch the ignition off the light goes off and stays off.
also some times when i press the brake the pedal seems to give a little, what i mean is : the brake pedal is pressed and is firm under foot but then
it suddenly drops some more.
ive got quotes for sensors from vauxhall £62 ea
but the pump is £616 + vat
i have found a pump on ebay for £45 recon.
id like to find out what the cause is before i start spending
thanks in advance for your help.
rob

Stupink · by **Stupink** » Fri Oct 10, 2008 7:19 pm

Hi you can read the codes on most if not all. im not sure which.
if you do a search on here for whats called the paperclip test, it involves shorting out a couple of pins and reading a diagnostic code..

its pins A and K i believe for abs

codes are
16 LH Front Solenoid ( Relay & Connections )
17 RH Front Solenoid ( Relay & Connections )
18 Rear Solenoids ( Relay & Connections )
19 Solenoids Relay Circuits
25 Faulty Sensor toothed Ring
35 Pump Relay Circuits
37 Stop Lamp Switch ( Pedal Switch )
39 LH Front Speed Sensor ( Air Gap & Operation )
41 LH Front Speed Sensor ( Resistance & Connections )
42 RH Front Speed Sensor ( Air Gap & Operation )
43 RH Front Speed Sensor ( Resistance & Connections )
44 LH Rear Speed Sensor ( Air Gap & Operation )
45 LH Rear Speed Sensor ( Resistance & Connections )
46 RH Rear Speed Sensor ( Air Gap & Operation )
47 RH Rear Speed Sensor ( Resistance & Connections )
48 System Voltage High/Low ( Alternator & Battery )
55 Faulty ECU

**vinny_69** · by **vinny_69** » Fri Oct 10, 2008 7:20 pm

sounds like a pressure issue to me,you wouldnt feel anything with the sensor fooked whats it like under hard braking?

**vcab1** · by **vcab1** » Fri Oct 10, 2008 7:33 pm

paper clip test, thats a bit technical for me lol.
under hard braking i dont think it stops as it should, i have got new discs
to put on, its just the abs light that worries me.
ive just checked the last mot from the previous owner
its got an advisory for a slightly corroded rear brake line
could this be the cause?
rob

**vinny_69** · by **vinny_69** » Fri Oct 10, 2008 7:35 pm

that would cause a pressure issue, a nice cheap fix

**vcab1** · by **vcab1** » Fri Oct 10, 2008 7:39 pm

would this make the abs light come on from time to time?
if so i hope this solves my problem.
is this an easy job for a novice? lol

**vinny_69** · by **vinny_69** » Fri Oct 10, 2008 7:41 pm

can you bleed a sytem?

**vcab1** · by **vcab1** » Fri Oct 10, 2008 7:43 pm

ive not done a whole system before, just the odd corner, along time ago
any help would be grateful lol

**vinny_69** · by **vinny_69** » Fri Oct 10, 2008 7:47 pm

whats your location mate?

**vcab1** · by **vcab1** » Fri Oct 10, 2008 7:49 pm

im near worcester (midlands)
5 mins from j5 m5

**vinny_69** · by **vinny_69** » Fri Oct 10, 2008 7:52 pm

ah right bit far for me :-k

its quite a easy job have you got a haynes? you should be able to get away with only doing one corner.

**vcab1** · by **vcab1** » Fri Oct 10, 2008 7:54 pm

not got the bible lol.
would i have to replace with a metal line or can i buy some flexi hose?

**vinny_69** · by **vinny_69** » Fri Oct 10, 2008 7:59 pm

if its the copper pipe bit no,but if it's the rubber part yes you can replace it with arubber one or braided hose

**vcab1** · by **vcab1** » Fri Oct 10, 2008 8:02 pm

i must assume its the copper bit then, being corroded.
is this an off the shelf part or i need to have made?
sorry for all the q's not all that good at car tech stuff lol

**vinny_69** · by **vinny_69** » Fri Oct 10, 2008 8:07 pm

no bother mate :alright:

i understand :lol:

if its the rubber i think it is
but im not sure about the pipe, sorry

abs

abs

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