Braking problems...

During a run, my abs and traction control lights came on, and I lost servo assistance. The pedal is firm, and there is fluid in the system, and the car still stops slowly, albeit with no servo assistance.

I have been through all 48 pages of checks in the electronic troubleshooting manual, and there are no faults showing with any parts of the system. The pump runs fine when power is applied directly.

I'm stumped!

VogueLSE4.2 said:

During a run, my abs and traction control lights came on, and I lost servo assistance. The pedal is firm, and there is fluid in the system, and the car still stops slowly, albeit with no servo assistance.

I have been through all 48 pages of checks in the electronic troubleshooting manual, and there are no faults showing with any parts of the system. The pump runs fine when power is applied directly.

I'm stumped!

Click to expand...

And what about when it isn't??

Does it run after a few pedal pushes or nothing at all??

Could be pressure switch or relay if it doesn't run in the normal fashion...

Saint.V8 said:

And what about when it isn't??

Does it run after a few pedal pushes or nothing at all??

Could be pressure switch or relay if it doesn't run in the normal fashion...

Click to expand...

Nothing at all.

Pressure switch duff, relay duff, fuse blown.

Bit of an update....


The ECU was giving a fault code that it wasn't receiving power, despite the live feed in to the ecu being ok.

I have replaced the ECU with another good one, but the problem remains.

Where do I go from here?

As above Pressure switch - Relay - Fuse

leek in pipe ,from sevo to eng

VogueLSE4.2 said:

Bit of an update....


The ECU was giving a fault code that it wasn't receiving power, despite the live feed in to the ecu being ok.

I have replaced the ECU with another good one, but the problem remains.

Where do I go from here?

Click to expand...

There may be nothing wrong with the power feed but I would suggest taking all the earth connections apart, cleaning them and then putting them back. Also, I assume your substitute ECU is one with the traction control as I believe the non-traction ABS systems use a slightly different ECU.

My only other thought would be the wheel sensors but usually any problem there the warning light comes on. HTH.

I did a few more tests, and after changing the pressure switch on the pump with no success, decided to change the whole pump.

Problem solved - all working again!

VogueLSE4.2 said:

I did a few more tests, and after changing the pressure switch on the pump with no success, decided to change the whole pump.

Problem solved - all working again!

Click to expand...

Glad it's sorted. As far as I know the ABS and traction are O.K. on my project LSE but I'll bear this in mind.