ABS probs.. i think

7th January 2011, 18:16

Hi guys,

Brake probs still! Help anybody?

So far had it to 3 mechanics, each of whom have changed pads, discs, pipes and bushings. Still having the same prob with my 99 vts, which is...

Whenever coming to a stop (5mph - 0mph), and pressing in brake pedal, it suddenly goes stff, and the ABS kicks in, causing the pedal to be almost inoperative, and loss of braking completley until I pump it 2 or 3 times.

9 out of 10 times the car stops fine, however I dont like taking the chance with that 1 time when it doesnt.
Rang Citroen, told me they can hook it up to the diagnostic machine for £60, and charge £60 p/hr thereafter for labour.

The latest mechanic (2hrs ago), found a broken ABS sensor in the rear right hand side wheel while he was cleaning the calipers.. is this finaly the cause?? He's not sure. He said maybe sensor, ABS pump or servo...
Or shall I just reluctantly pay the ridicuous money to Ctroen to (possibly?) tell me that same thing!
So far paid 3 mechanics a fair amount, and still no further with brake prob.

Thanks in advance,

7th January 2011, 18:21

Make sure all the ABS sensors and rings are clean from rust and crap first of all. Then you could do with a rolling road or on the move diagnostic to read the ABS system and see if there is a difference / drop out in the 4 readings.

7th January 2011, 18:23

thanks mate, yea the mechanic today cleaned the rear 2 ABS sensors off dirt n crap, thats how he noticed one broken.

Think this one sensor could cause all this fus?

7th January 2011, 18:24

Try something simple and check the vacuum hose from the engine to the Servo. Doesn't any of the 3 mechanics have a diagnostics machine?? they should bloomin do!

Doubt it would be the cause tbh as if it was an ABS sensor the abs system wouldn't be functioning anyway so you would have no abs and plus the light would come on on the dash.

7th January 2011, 18:26

Quote:

Originally Posted by Jordysport

Doesn't any of the 3 mechanics have a diagnostics machine?? they should bloomin do!

yea they should mate, but dont!

tried the vaccum hose, working fine. cheers tho

7th January 2011, 18:34

only thing else i could suggest is to bleed the brakes, if not it maybe the ABS Pump/ECU so needs to go onto diagnostics

7th January 2011, 18:35

The brakes have been bled today mate, no change, so maybe the pump not sure?

7th January 2011, 19:13

A broken sensor or a big difference in speed readings would certainly bring up the ABS warning light if there was a fault. Does it light up with ignition then go out?

8th January 2011, 19:10

yea mate, the ABS light comes on for about 2secs then dissapears.

is that normal?

cheers

8th January 2011, 21:49

Quote:

Originally Posted by djshongo

yea mate, the ABS light comes on for about 2secs then dissapears.

is that normal?

cheers

yup thats normal

8th January 2011, 21:52

Sounds like the abs sensor. or also poss brake servo my mate saying?

8th January 2011, 22:50

My light comes on and goes out after I start the car but that's it
Mine doesn't do sweet fa if I brake hard the car just skids
Try unplugging the abs pump and see if it still has the problem

9th January 2011, 10:29

Quote:

Originally Posted by marc24

Sounds like the abs sensor. or also poss brake servo my mate saying?

If there was a prob with the abs system the light eould be on its not on so no prob, and not brake servo as it works fine for most of the time but only buggers when at low speed, must be electrical

Quote:

Originally Posted by bengtt5

My light comes on and goes out after I start the car but that's it
Mine doesn't do sweet fa if I brake hard the car just skids
Try unplugging the abs pump and see if it still has the problem

maybe your light was wired to the oil light? does it go out exactly the same time? may have been bodged for mot,

9th January 2011, 13:18

Nope its all wired up as citroen left it

9th January 2011, 17:23

Quote:

Originally Posted by bengtt5

Nope its all wired up as citroen left it

Well you have a problem with your system, all of mine work fine so its not a citroen fault, but good shout unplug the ABS pump see if it happens then. then you know its the ABS ECU/Pump unit

11th January 2011, 18:36

thx for all the advice guys, goin in to the garage 2moro to try a few of these things, and i'll let ya know how i get on!